1. 打印View所有子视图

po [[self view]recursiveDescription]

2. layoutSubviews调用的调用时机

* 当视图第一次显示的时候会被调用* 当这个视图显示到屏幕上了,点击按钮* 添加子视图也会调用这个方法* 当本视图的大小发生改变的时候是会调用的* 当子视图的frame发生改变的时候是会调用的* 当删除子视图的时候是会调用的

3. NSString过滤特殊字符

// 定义一个特殊字符的集合NSCharacterSet *set = [NSCharacterSet characterSetWithCharactersInString:@"@／：；（）¥「」＂、[]{}#%-*+=_\\|~＜＞$€^•'@#$%^&*()_+'\""];// 过滤字符串的特殊字符NSString *newString = [trimString stringByTrimmingCharactersInSet:set];

4. TransForm属性

//平移按钮CGAffineTransform transForm = self.buttonView.transform;self.buttonView.transform = CGAffineTransformTranslate(transForm, 10, 0);//旋转按钮CGAffineTransform transForm = self.buttonView.transform;self.buttonView.transform = CGAffineTransformRotate(transForm, M_PI_4);//缩放按钮self.buttonView.transform = CGAffineTransformScale(transForm, 1.2, 1.2);//初始化复位self.buttonView.transform = CGAffineTransformIdentity;

5. 去掉分割线多余15像素

首先在viewDidLoad方法加入以下代码： if ([self.tableView respondsToSelector:@selector(setSeparatorInset:)]) {        [self.tableView setSeparatorInset:UIEdgeInsetsZero];    }    if ([self.tableView respondsToSelector:@selector(setLayoutMargins:)]) {                [self.tableView setLayoutMargins:UIEdgeInsetsZero];}然后在重写willDisplayCell方法- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath{       if ([cell respondsToSelector:@selector(setSeparatorInset:)]) {                    [cell setSeparatorInset:UIEdgeInsetsZero];        }        if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {                     [cell setLayoutMargins:UIEdgeInsetsZero];        }}

6. 计算方法耗时时间间隔

// 获取时间间隔#define TICK   CFAbsoluteTime start = CFAbsoluteTimeGetCurrent();#define TOCK   NSLog(@"Time: %f", CFAbsoluteTimeGetCurrent() - start)

7. Color颜色宏定义

// 随机颜色#define RANDOM_COLOR [UIColor colorWithRed:arc4random_uniform(256) / 255.0 green:arc4random_uniform(256) / 255.0 blue:arc4random_uniform(256) / 255.0 alpha:1]// 颜色(RGB)#define RGBCOLOR(r, g, b) [UIColor colorWithRed:(r)/255.0f green:(g)/255.0f blue:(b)/255.0f alpha:1]// 利用这种方法设置颜色和透明值，可不影响子视图背景色#define RGBACOLOR(r, g, b, a) [UIColor colorWithRed:(r)/255.0f green:(g)/255.0f blue:(b)/255.0f alpha:(a)]

8. Alert提示宏定义

#define Alert(_S_, ...) [[[UIAlertView alloc] initWithTitle:@"提示" message:[NSString stringWithFormat:(_S_), ##__VA_ARGS__] delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil] show]

9. 让iOS应用直接退出

- (void)exitApplication {    AppDelegate *app = [UIApplication sharedApplication].delegate;    UIWindow *window = app.window;    [UIView animateWithDuration:1.0f animations:^{        window.alpha = 0;    } completion:^(BOOL finished) {        exit(0);    }];}

10. NSArray 快速求总和 最大值 最小值 和 平均值

NSArray *array = [NSArray arrayWithObjects:@"2.0", @"2.3", @"3.0", @"4.0", @"10", nil];CGFloat sum = [[array valueForKeyPath:@"@sum.floatValue"] floatValue];CGFloat avg = [[array valueForKeyPath:@"@avg.floatValue"] floatValue];CGFloat max =[[array valueForKeyPath:@"@max.floatValue"] floatValue];CGFloat min =[[array valueForKeyPath:@"@min.floatValue"] floatValue];NSLog(@"%f\n%f\n%f\n%f",sum,avg,max,min);

10. 修改Label中不同文字颜色

- (void)touchesEnded:(NSSet
    
      *)touches withEvent:(UIEvent *)event{    [self editStringColor:self.label.text editStr:@"好" color:[UIColor blueColor]];}- (void)editStringColor:(NSString *)string editStr:(NSString *)editStr color:(UIColor *)color {    // string为整体字符串, editStr为需要修改的字符串    NSRange range = [string rangeOfString:editStr];    NSMutableAttributedString *attribute = [[NSMutableAttributedString alloc] initWithString:string];    // 设置属性修改字体颜色UIColor与大小UIFont    [attribute addAttributes:@{NSForegroundColorAttributeName:color} range:range];    self.label.attributedText = attribute;}
    

11. 播放声音

#import
    
        //  1.获取音效资源的路径   NSString *path = [[NSBundle mainBundle]pathForResource:@"pour_milk" ofType:@"wav"];   //  2.将路劲转化为url   NSURL *tempUrl = [NSURL fileURLWithPath:path];   //  3.用转化成的url创建一个播放器   NSError *error = nil;   AVAudioPlayer *play = [[AVAudioPlayer alloc]initWithContentsOfURL:tempUrl error:&error];   self.player = play;   //  4.播放   [play play];
    

12. 检测是否IPad Pro

- (BOOL)isIpadPro{     UIScreen *Screen = [UIScreen mainScreen];     CGFloat width = Screen.nativeBounds.size.width/Screen.nativeScale;    CGFloat height = Screen.nativeBounds.size.height/Screen.nativeScale;           BOOL isIpad =[[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad;     BOOL hasIPadProWidth = fabs(width - 1024.f) < DBL xss=removed xss=removed xss=removed xss=removed xss=removed xss=removed xss=removed xss=removed xss=removed>> ~/.lldbinit    echo target stop-hook add -o \"target stop-hook disable\" >> ~/.lldbinit下次重新运行项目，然后就不报错了。

25. Label行间距

-（void）test{    NSMutableAttributedString *attributedString =       [[NSMutableAttributedString alloc] initWithString:self.contentLabel.text];    NSMutableParagraphStyle *paragraphStyle =  [[NSMutableParagraphStyle alloc] init];     [paragraphStyle setLineSpacing:3];    //调整行间距          [attributedString addAttribute:NSParagraphStyleAttributeName                          value:paragraphStyle                          range:NSMakeRange(0, [self.contentLabel.text length])];     self.contentLabel.attributedText = attributedString;}

26. UIImageView填充模式

@"UIViewContentModeScaleToFill",      // 拉伸自适应填满整个视图  @"UIViewContentModeScaleAspectFit",   // 自适应比例大小显示  @"UIViewContentModeScaleAspectFill",  // 原始大小显示  @"UIViewContentModeRedraw",           // 尺寸改变时重绘  @"UIViewContentModeCenter",           // 中间  @"UIViewContentModeTop",              // 顶部  @"UIViewContentModeBottom",           // 底部  @"UIViewContentModeLeft",             // 中间贴左  @"UIViewContentModeRight",            // 中间贴右  @"UIViewContentModeTopLeft",          // 贴左上  @"UIViewContentModeTopRight",         // 贴右上  @"UIViewContentModeBottomLeft",       // 贴左下  @"UIViewContentModeBottomRight",      // 贴右下

27. 宏定义检测block是否可用

#define BLOCK_EXEC(block, ...) if (block) { block(__VA_ARGS__); };   // 宏定义之前的用法 if (completionBlock)   {       completionBlock(arg1, arg2);   }    // 宏定义之后的用法 BLOCK_EXEC(completionBlock, arg1, arg2);

28. Debug栏打印时自动把Unicode编码转化成汉字

// 有时候我们在xcode中打印中文,会打印出Unicode编码,还需要自己去一些在线网站转换,有了插件就方便多了。 DXXcodeConsoleUnicodePlugin 插件

29. 设置状态栏文字样式颜色

[[UIApplication sharedApplication] setStatusBarHidden:NO];[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];

30. 自动生成模型代码的插件

// 可自动生成模型的代码，省去写模型代码的时间ESJsonFormat-for-Xcode

31. iOS中的一些手势

轻击手势（TapGestureRecognizer）轻扫手势（SwipeGestureRecognizer）长按手势（LongPressGestureRecognizer）拖动手势（PanGestureRecognizer）捏合手势（PinchGestureRecognizer）旋转手势（RotationGestureRecognizer）

32. iOS 开发中一些相关的路径

模拟器的位置:/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs 文档安装位置:/Applications/Xcode.app/Contents/Developer/Documentation/DocSets插件保存路径:~/Library/ApplicationSupport/Developer/Shared/Xcode/Plug-ins自定义代码段的保存路径:~/Library/Developer/Xcode/UserData/CodeSnippets/ 如果找不到CodeSnippets文件夹，可以自己新建一个CodeSnippets文件夹。证书路径~/Library/MobileDevice/Provisioning Profiles

33. 获取 iOS 路径的方法

获取家目录路径的函数NSString *homeDir = NSHomeDirectory();获取Documents目录路径的方法NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);NSString *docDir = [paths objectAtIndex:0];获取Documents目录路径的方法NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);NSString *cachesDir = [paths objectAtIndex:0];获取tmp目录路径的方法：NSString *tmpDir = NSTemporaryDirectory();

34. 字符串相关操作

去除所有的空格[str stringByReplacingOccurrencesOfString:@" " withString:@""]去除首尾的空格[str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];- (NSString *)uppercaseString; 全部字符转为大写字母- (NSString *)lowercaseString 全部字符转为小写字母

35. CocoaPods pod install/pod update更新慢的问题

pod install --verbose --no-repo-update pod update --verbose --no-repo-update如果不加后面的参数，默认会升级CocoaPods的spec仓库，加一个参数可以省略这一步，然后速度就会提升不少。

36. MRC和ARC混编设置方式

在XCode中targets的build phases选项下Compile Sources下选择 不需要arc编译的文件双击输入 -fno-objc-arc 即可MRC工程中也可以使用ARC的类，方法如下：在XCode中targets的build phases选项下Compile Sources下选择要使用arc编译的文件双击输入 -fobjc-arc 即可

37. 把tableview里cell的小对勾的颜色改成别的颜色

_mTableView.tintColor = [UIColor redColor];

38. 调整tableview的separaLine线的位置

tableView.separatorInset = UIEdgeInsetsMake(0, 100, 0, 0);

39. 设置滑动的时候隐藏navigationbar

navigationController.hidesBarsOnSwipe = Yes

40. 自动处理键盘事件，实现输入框防遮挡的插件

IQKeyboardManagerhttps://github.com/hackiftekhar/IQKeyboardManager

41. Quartz2D相关

图形上下是一个CGContextRef类型的数据。图形上下文包含：1，绘图路径（各种各样图形）2，绘图状态（颜色，线宽，样式，旋转，缩放，平移）3，输出目标（绘制到什么地方去？UIView、图片）1，获取当前图形上下文CGContextRef ctx = UIGraphicsGetCurrentContext();2，添加线条CGContextMoveToPoint(ctx, 20, 20);3，渲染CGContextStrokePath(ctx);CGContextFillPath(ctx);4，关闭路径CGContextClosePath(ctx);5，画矩形CGContextAddRect(ctx, CGRectMake(20, 20, 100, 120));6，设置线条颜色[[UIColor redColor] setStroke];7， 设置线条宽度CGContextSetLineWidth(ctx, 20);8，设置头尾样式CGContextSetLineCap(ctx, kCGLineCapSquare);9，设置转折点样式CGContextSetLineJoin(ctx, kCGLineJoinBevel);10，画圆CGContextAddEllipseInRect(ctx, CGRectMake(30, 50, 100, 100));11，指定圆心CGContextAddArc(ctx, 100, 100, 50, 0, M_PI * 2, 1);12，获取图片上下文UIGraphicsGetImageFromCurrentImageContext();13，保存图形上下文CGContextSaveGState(ctx)14，恢复图形上下文CGContextRestoreGState(ctx)

42. 屏幕截图

// 1. 开启一个与图片相关的图形上下文    UIGraphicsBeginImageContextWithOptions(self.view.bounds.size,NO,0.0);    // 2. 获取当前图形上下文    CGContextRef ctx = UIGraphicsGetCurrentContext();    // 3. 获取需要截取的view的layer    [self.view.layer renderInContext:ctx];    // 4. 从当前上下文中获取图片    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();    // 5. 关闭图形上下文    UIGraphicsEndImageContext();    // 6. 把图片保存到相册    UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);

第二种写法

/**     *截图功能     */     -(void)screenShot{                           CGRect rect = self.view.frame;         UIGraphicsBeginImageContext(rect.size);         CGContextRef context = UIGraphicsGetCurrentContext();         [self.view.layer renderInContext:context];         UIImage *img = UIGraphicsGetImageFromCurrentImageContext();         UIGraphicsEndImageContext();                  i = [[UIImageView alloc]initWithFrame:CGRectMake(20, 70, 300, 500)];         i.layer.borderColor = [UIColor redColor].CGColor;         i.layer.borderWidth = 2;         i.image = img;                  [self.view addSubview:i];         i.userInteractionEnabled = YES;         //tap手势         UITapGestureRecognizer *tapGesture=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(event:)];         [i addGestureRecognizer:tapGesture];         [tapGesture setNumberOfTapsRequired:1];              }

43. 隐藏导航栏上的返回字体

//SwiftUIBarButtonItem.appearance().setBackButtonTitlePositionAdjustment(UIOffsetMake(0, -60), forBarMetrics: .Default)//OC[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60) forBarMetrics:UIBarMetricsDefault];

44. 解决tableview的分割线短一截

-(void)viewDidLayoutSubviews{if ([self.tableView respondsToSelector:@selector(setSeparatorInset:)]){ [self.tableView setSeparatorInset:UIEdgeInsetsMake(0,0,0,0)];}if ([self.tableView respondsToSelector:@selector(setLayoutMargins:)]) {[self.tableView setLayoutMargins:UIEdgeInsetsMake(0,0,0,0)]; }}-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath{if ([cell respondsToSelector:@selector(setSeparatorInset:)]) {[cell setSeparatorInset:UIEdgeInsetsZero]; } if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {[cell setLayoutMargins:UIEdgeInsetsZero]; }}

45. 动态隐藏NavigationBar

//1.当我们的手离开屏幕时候隐藏- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset{ if(velocity.y > 0) {[self.navigationController setNavigationBarHidden:YES animated:YES];} else {[self.navigationController setNavigationBarHidden:NO animated:YES]; }}velocity.y这个量，在上滑和下滑时，变化极小（小数），但是因为方向不同，有正负之分，这就很好处理了。

//2.在滑动过程中隐藏//像safari(1) self.navigationController.hidesBarsOnSwipe = YES;(2)- (void)scrollViewDidScroll:(UIScrollView *)scrollView{ CGFloat offsetY = scrollView.contentOffset.y + __tableView.contentInset.top; CGFloat panTranslationY = [scrollView.panGestureRecognizer translationInView:self.tableView].y; if (offsetY > 64) { if (panTranslationY > 0) { //下滑趋势，显示 [self.navigationController setNavigationBarHidden:NO animated:YES];} else { //上滑趋势，隐藏 [self.navigationController setNavigationBarHidden:YES animated:YES]; }} else {[self.navigationController setNavigationBarHidden:NO animated:YES]; }}这里的offsetY > 64只是为了在视图滑过navigationBar的高度之后才开始处理，防止影响展示效果。panTranslationY是scrollView的pan手势的手指位置的y值，可能不是太好，因为panTranslationY这个值在较小幅度上下滑动时，可能都为正或都为负，这就使得这一方式不太灵敏.

效果图

46. 设置导航栏透明

1第一种方式

//方法一:设置透明度[[[self.navigationController.navigationBar subviews]objectAtIndex:0] setAlpha:0.1];//方法二:设置背景图片/** * 设置导航栏,使其透明 **/- (void)setNavigationBarColor:(UIColor *)color targetController:(UIViewController *)targetViewController{//导航条的颜色 以及隐藏导航条的颜色targetViewController.navigationController.navigationBar.shadowImage = [[UIImage alloc]init]; CGRect rect=CGRectMake(0.0f, 0.0f, 1.0f, 1.0f); UIGraphicsBeginImageContext(rect.size);CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetFillColorWithColor(context, [color CGColor]); CGContextFillRect(context, rect); UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); [targetViewController.navigationController.navigationBar setBackgroundImage:theImage forBarMetrics:UIBarMetricsDefault];}

2、设置透明导航栏

立即投资BG为默认的导航栏 背景图片  

透明navbarBG 是一张纯透明的png 图片

- (void)viewWillAppear:(BOOL)animated {    [super viewWillAppear:animated];    [self createNav];  }- (void)createNav{    //替换导航栏透明    UINavigationBar *navigationBar = self.navigationController.navigationBar;    [navigationBar setTitleTextAttributes:@{                                            NSForegroundColorAttributeName :[UIColor whiteColor]                                            }];    //navigationBar.alpha = 0;    [navigationBar setBackgroundImage:[UIImage imageNamed:@"透明navbarBG"] forBarMetrics:UIBarMetricsDefault];    [navigationBar setBackgroundImage:[UIImage imageNamed:@"透明navbarBG"] forBarMetrics:UIBarMetricsCompact];    //去黑线    [navigationBar setBackgroundImage:[UIImage imageNamed:@"透明navbarBG"] forBarPosition:UIBarPositionAny barMetrics:UIBarMetricsDefault];    [navigationBar setShadowImage:[UIImage new]];}//退出页面时候 恢复不透明-(void)viewWillDisappear:(BOOL)animated{    [super viewWillDisappear:animated];    [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"立即投资BG"] forBarMetrics:UIBarMetricsDefault];    [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"立即投资BG"] forBarMetrics:UIBarMetricsCompact];   }// 当滚动视图滚动到最顶端后，执行该方法 //向上滚动时候不透明- (void)scrollViewDidScroll:(UIScrollView *)scrollView{            // NSLog(@"scrollViewDidScroll");        CGPoint point=scrollView.contentOffset;    if(point.y>5){        [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"立即投资BG"] forBarMetrics:UIBarMetricsDefault];        [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"立即投资BG"] forBarMetrics:UIBarMetricsCompact];        self.navigationController.navigationBar.barTintColor=[UIColor colorWithRed:243/255.0 green:90.0/255.0 blue:3.0/255.0 alpha:1.0];    }else{        UINavigationBar *navigationBar = self.navigationController.navigationBar;        [navigationBar setTitleTextAttributes:@{                                                NSForegroundColorAttributeName :[UIColor whiteColor]                                                }];        //navigationBar.alpha = 0;        [navigationBar setBackgroundImage:[UIImage imageNamed:@"透明navbarBG"] forBarMetrics:UIBarMetricsDefault];        [navigationBar setBackgroundImage:[UIImage imageNamed:@"透明navbarBG"] forBarMetrics:UIBarMetricsCompact];    }    // NSLog(@"%f,%f",point.x,point.y);    // 从中可以读取contentOffset属性以确定其滚动到的位置。    // 注意：当ContentSize属性小于Frame时，将不会出发滚动}

47. 设置字体和行间距

//设置字体和行间距 UILabel * lable = [[UILabel alloc]initWithFrame:CGRectMake(50, 100, 300, 200)]; lable.text = @"大家好,我是Frank_chun,在这里我们一起学习新的知识,总结我们遇到的那些坑,共同的学习,共同的进步,共同的努力,只为美好的明天!!!有问题一起相互的探讨--438637472!!!"; lable.numberOfLines = 0;lable.font = [UIFont systemFontOfSize:12];lable.backgroundColor = [UIColor grayColor]; [self.view addSubview:lable]; //设置每个字体之间的间距 //NSKernAttributeName 这个对象所对应的值是一个NSNumber对象(包含小数),作用是修改默认字体之间的距离调整,值为0的话表示字距调整是禁用的; NSMutableAttributedString * str = [[NSMutableAttributedString alloc]initWithString:lable.text attributes:@{NSKernAttributeName:@(5.0)}];//设置某写字体的颜色//NSForegroundColorAttributeName 设置字体颜色NSRange blueRange = NSMakeRange([[str string] rangeOfString:@"Frank_chun"].location, [[str string] rangeOfString:@"Frank_chun"].length); [str addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:blueRange]; NSRange blueRange1 = NSMakeRange([[str string] rangeOfString:@"438637472"].location, [[str string] rangeOfString:@"438637472"].length);[str addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:blueRange1];//设置每行之间的间距 //NSParagraphStyleAttributeName 设置段落的样式NSMutableParagraphStyle * par = [[NSMutableParagraphStyle alloc]init];[par setLineSpacing:20];//为某一范围内文字添加某个属性//NSMakeRange表示所要的范围,从0到整个文本的长度[str addAttribute:NSParagraphStyleAttributeName value:par range:NSMakeRange(0, lable.text.length)]; [lable setAttributedText:str];

效果图

48. 点击button倒计时

//第一种方法//点击button倒计时#import "ViewController.h"@interface ViewController ()@property (nonatomic, strong) UIButton * timeButton;@property (nonatomic, strong) NSTimer * timer;@property (nonatomic, strong)UIButton * btn;@end@implementation ViewController{ NSInteger _time;}- (void)viewDidLoad {[super viewDidLoad]; _time = 5; self.btn = [UIButton buttonWithType:UIButtonTypeCustom]; _btn.backgroundColor = [UIColor orangeColor];[_btn setTitle:@"获取验证码" forState:UIControlStateNormal]; _btn.titleLabel.font = [UIFont systemFontOfSize:15];[_timeButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];[_btn addTarget:self action:@selector(btnAction:) forControlEvents:UIControlEventTouchUpInside];[self refreshButtonWidth]; [self.view addSubview:self.btn];}- (void)refreshButtonWidth{ CGFloat width = 0; if (_btn.enabled){ width = 100; } else { width = 200;} _btn.center = CGPointMake(self.view.frame.size.width/2, 200);_btn.bounds = CGRectMake(0, 0, width, 40); //每次刷新，保证区域正确[_btn setBackgroundImage:[self imageWithColor:[UIColor orangeColor] andSize:_btn.frame.size] forState:UIControlStateNormal];[_btn setBackgroundImage:[self imageWithColor:[UIColor lightGrayColor] andSize:_btn.frame.size] forState:UIControlStateDisabled];}- (UIImage *)imageWithColor:(UIColor *)color andSize:(CGSize)aSize{ CGRect rect = CGRectMake(0.0f, 0.0f, aSize.width, aSize.height); UIGraphicsBeginImageContext(rect.size); CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetFillColorWithColor(context, [color CGColor]); CGContextFillRect(context, rect); UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext();return image;}- (void)btnAction:(UIButton *)sender{sender.enabled = NO;[self refreshButtonWidth];[sender setTitle:[NSString stringWithFormat:@"获取验证码(%zi)", _time] forState:UIControlStateNormal]; _timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(timeDown) userInfo:nil repeats:YES];}- (void)timeDown{ _time --; if (_time == 0) { [_btn setTitle:@"重新获取" forState:UIControlStateNormal]; _btn.enabled = YES; [self refreshButtonWidth]; [_timer invalidate]; _timer = nil; _time = 5 ; return; } [_btn setTitle:[NSString stringWithFormat:@"获取验证码(%zi)", _time] forState:UIControlStateNormal];}

//第二种方法#pragma mark -点击发送验证码- (void)sendMessage:(UIButton *)btn{if (self.phoneField.text.length == 0) { [self remindMessage:@"请输入正确的手机号"];}else{ __block int timeout=60; //倒计时时间 dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); dispatch_source_t _timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0,queue); dispatch_source_set_timer(_timer,dispatch_walltime(NULL, 0),1.0*NSEC_PER_SEC, 0); //每秒执行 dispatch_source_set_event_handler(_timer, ^{ if(timeout<=0){ //倒计时结束，关闭 dispatch_source_cancel(_timer); dispatch_async(dispatch_get_main_queue(), ^{ // 设置界面的按钮显示 根据自己需求设置 [btn setTitle:@"发送验证码" forState:UIControlStateNormal]; btn.userInteractionEnabled = YES; }); }else{ int seconds = timeout % 60;NSString *strTime = [NSString stringWithFormat:@"%d", seconds];if ([strTime isEqualToString:@"0"]) { strTime = [NSString stringWithFormat:@"%d",60]; } dispatch_async(dispatch_get_main_queue(), ^{ //设置界面的按钮显示 根据自己需求设置 //NSLog(@"____%@",strTime);[UIView beginAnimations:nil context:nil];[UIView setAnimationDuration:1]; [btn setTitle:[NSString stringWithFormat:@"%@秒后重新发送",strTime] forState:UIControlStateNormal];[UIView commitAnimations]; btn.userInteractionEnabled = NO; }); timeout--; } }); dispatch_resume(_timer);}

效果图

49. UITextField默认占位符是居中显示,让其居上显示

textField.contentVerticalAlignment = UIControlContentVerticalAlignmentTop;

50. 解决同时按两个按钮进两个view的问题

[button setExclusiveTouch:YES];

51. 图片拉伸

UIImage* img=[UIImage imageNamed:@"2.png"];//原图UIEdgeInsets edge=UIEdgeInsetsMake(0, 10, 0,10);//UIImageResizingModeStretch：拉伸模式，通过拉伸UIEdgeInsets指定的矩形区域来填充图片//UIImageResizingModeTile：平铺模式，通过重复显示UIEdgeInsets指定的矩形区域来填充图img= [img resizableImageWithCapInsets:edge resizingMode:UIImageResizingModeStretch];self.imageView.image=img;

52. 修改textFieldplaceholder字体颜色和大小

textField.placeholder = @"username is in here!";  [textField setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"];  [textField setValue:[UIFont boldSystemFontOfSize:16] forKeyPath:@"_placeholderLabel.font"];

53. 修改状态栏字体颜色

只能设置两种颜色，黑色和白色，系统默认黑色设置为白色方法：（1）在plist里面添加Status bar style，值为UIStatusBarStyleLightContent（白色）或UIStatusBarStyleDefault（黑 色）（2）在Info.plist中设置UIViewControllerBasedStatusBarAppearance 为NO

54. 去掉导航栏下边的黑线

[self.navigationController.navigationBar setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault];self.navigationController.navigationBar.shadowImage = [[UIImage alloc] init];

55. 修改pagecontrol颜色

_pageControl.currentPageIndicatorTintColor=SFQRedColor;_pageControl.pageIndicatorTintColor=SFQGrayColor;

56. 去掉UITableView的section的粘性，使其不会悬停

//有时候使用UITableView所实现的列表，会使用到section，但是又不希望它粘在最顶上而是跟随滚动而消失或者出现- (void)scrollViewDidScroll:(UIScrollView *)scrollView {      if (scrollView == _tableView) {          CGFloat sectionHeaderHeight = 36;        if (scrollView.contentOffset.y <= sectionHeaderHeight && scrollView.contentOffset.y >= 0) {              scrollView.contentInset = UIEdgeInsetsMake(-scrollView.contentOffset.y, 0, 0, 0);          } else if (scrollView.contentOffset.y >= sectionHeaderHeight) {              scrollView.contentInset = UIEdgeInsetsMake(-sectionHeaderHeight, 0, 0, 0);          }      }  }

57. 通过2D仿射函数实现小的动画效果(变大缩小) --可用于自定义pageControl中

[UIView animateWithDuration:0.3 animations:^{       imageView.transform = CGAffineTransformMakeScale(2, 2);       } completion:^(BOOL finished) {       imageView.transform = CGAffineTransformMakeScale(1.0, 1.0);       }];

58. UIImage与字符串互转

//图片转字符串  -(NSString *)UIImageToBase64Str:(UIImage *) image  {      NSData *data = UIImageJPEGRepresentation(image, 1.0f);      NSString *encodedImageStr = [data base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];      return encodedImageStr;  }//字符串转图片  -(UIImage *)Base64StrToUIImage:(NSString *)_encodedImageStr  {      NSData *_decodedImageData   = [[NSData alloc] initWithBase64Encoding:_encodedImageStr];      UIImage *_decodedImage      = [UIImage imageWithData:_decodedImageData];      return _decodedImage;  }

59. 判断NSString中是否包含中文

-(BOOL)isChinese:(NSString *)str{    NSString *match=@"(^[\u4e00-\u9fa5]+$)";    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF matches %@", match];    return [predicate evaluateWithObject:str];}

60. NSDate与NSString的相互转化

-(NSString *)dateToString:(NSDate *)date {  // 初始化时间格式控制器  NSDateFormatter *matter = [[NSDateFormatter alloc] init];  // 设置设计格式  [matter setDateFormat:@"yyyy-MM-dd hh:mm:ss zzz"];  // 进行转换  NSString *dateStr = [matter stringFromDate:date];  return dateStr;}-(NSDate *)stringToDate:(NSString *)dateStr {  // 初始化时间格式控制器  NSDateFormatter *matter = [[NSDateFormatter alloc] init];  // 设置设计格式  [matter setDateFormat:@"yyyy-MM-dd hh:mm:ss zzz"];  // 进行转换  NSDate *date = [matter dateFromString:dateStr];  return date;}

61、imageView添加手势

imageview.userInteractionEnabled = YES;     //tap手势     UITapGestureRecognizer *tapGesture=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(event:)];     [imageview addGestureRecognizer:tapGesture];    [tapGesture setNumberOfTapsRequired:1];    - (void)event:(UITapGestureRecognizer *)gesture    {        NSLog(@"单击");    }

62、获取请求连接里边的cookies

#pragma mark //获取请求连接的cookies      [manager POST:urlStr parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) {    if (success) {        success(responseObject);                NSDictionary *fields = [operation.response allHeaderFields]; //afnetworking写法        NSLog(@"fields = %@",[fields description]);        // NSURL *url = [NSURL URLWithString:@"http://api.skyfox.org/api-test.php"];        NSURL *url = [NSURL URLWithString:urlStr];        //获取cookie方法1        NSArray *cookies = [NSHTTPCookie cookiesWithResponseHeaderFields:fields forURL:url];        NSLog(@"11--%@",cookies);        //获取cookie方法2        //NSString *cookieString = [[HTTPResponse allHeaderFields] valueForKey:@"Set-Cookie"];    }} failure:^(AFHTTPRequestOperation *operation, NSError *error) {    //  NSLog(@"%@", error);    if (fail) {        fail();    }}];

63图片旋转

imageView1 .transform=CGAffineTransformMakeRotation(M_PI_2);

64、获取字符串在label中需要的宽度

#pragma mark //获取字符串需要的宽度 +(CGFloat)ZFYtextWidthFromTextString:(NSString *)text fontSize:(CGFloat)size{          CGSize size1 = [text sizeWithAttributes:@{NSFontAttributeName: [UIFont systemFontOfSize:size]}];    //返回计算出的行高     return size1.width; }

65、获取字符串在label中需要的高度

#pragma mark//获取字符串需要的高度 +(CGFloat)ZFYtextHeightFromTextString:(NSString *)text width:(CGFloat)textWidth fontSize:(CGFloat)size{          NSDictionary *dict = @{NSFontAttributeName:[UIFont systemFontOfSize:size]};     CGRect rect = [text boundingRectWithSize:CGSizeMake(textWidth, MAXFLOAT) options:NSStringDrawingTruncatesLastVisibleLine|NSStringDrawingUsesFontLeading|NSStringDrawingUsesLineFragmentOrigin attributes:dict context:nil];     //返回计算出的行高     return rect.size.height; }

66、汉字和Unicode编码转换

#pragma mark//Unicode转汉字   \u5f20\u4e09 → 张三 - (NSString *)replaceUnicode:(NSString *)unicodeStr {     //张三  \u5f20\u4e09          NSString *tempStr1 = [unicodeStr stringByReplacingOccurrencesOfString:@"\\u" withString:@"\\U"];     NSString *tempStr2 = [tempStr1 stringByReplacingOccurrencesOfString:@"\"" withString:@"\\\""];     NSString *tempStr3 = [[@"\"" stringByAppendingString:tempStr2] stringByAppendingString:@"\""];     NSData *tempData = [tempStr3 dataUsingEncoding:NSUTF8StringEncoding];     NSString* returnStr = [NSPropertyListSerialization propertyListFromData:tempData                                                            mutabilityOption:NSPropertyListImmutable                                                                      format:NULL                                                            errorDescription:NULL];          //  NSLog(@"Output = %@", returnStr);     return [returnStr stringByReplacingOccurrencesOfString:@"\\r\\n" withString:@"\n"]; }#pragma mark//汉字转 Unicode   张三 →  \u5f20\u4e09 -(NSString *) utf8ToUnicode:(NSString *)string{          NSUInteger length = [string length];     NSMutableString *s = [NSMutableString stringWithCapacity:0];     for (int i = 0;i < length; i++){         unichar _char = [string characterAtIndex:i];         //判断是否为英文和数字         if (_char <= '9' && _char >='0'){             [s appendFormat:@"%@",[string substringWithRange:NSMakeRange(i,1)]];         }else if(_char >='a' && _char <= 'z'){             [s appendFormat:@"%@",[string substringWithRange:NSMakeRange(i,1)]];         }else if(_char >='A' && _char <= 'Z')         {             [s appendFormat:@"%@",[string substringWithRange:NSMakeRange(i,1)]];         }else{             [s appendFormat:@"\\u%x",[string characterAtIndex:i]];         }     }     return s; }

67、获取间隔一天 一年一秒之后的时间

#pragma mark //获取相对时间  获取两个月前的时间  -2 为两个月前时间   2为两个月后时间 - (void)RelativeTime {     NSDateComponents * components = [[NSDateComponents alloc] init];     components.month = -2;     //    components.day = 10;     //    components.hour = 10;     NSCalendar * calendar = [NSCalendar currentCalendar];          NSDate * currentDate = [NSDate date];     NSDate * nextData = [calendar dateByAddingComponents:components toDate:currentDate options:NSCalendarMatchStrictly];     NSDateFormatter * formatter = [[NSDateFormatter alloc] init];          formatter.dateFormat = @"yyyy年MM月dd日HH时mm分ss秒";     NSString * str = [formatter stringFromDate:nextData];     NSLog(@"%@",str);      }

68、打印系统字体库名字

#pragma mark   打印系统字体库 名字 NSArray *familyNames = [UIFont familyNames]; for( NSString *familyName in familyNames ) {     printf( "Family: %s \n", [familyName UTF8String]);          NSArray *fontNames = [UIFont fontNamesForFamilyName:familyName];     for( NSString *fontName in fontNames )     {         printf( "\tFont: %s \n", [fontName UTF8String] );              } }

69、 截取正方形的图片

//截取正方形的图片 centerBool为YES  表示从中心开始截取+(UIImage*)getSubImage:(UIImage *)image mCGRect:(CGRect)mCGRect centerBool:(BOOL)centerBool{ /*如若centerBool为Yes则是由中心点取mCGRect范围的图片*/  float imgWidth = image.size.width; float imgHeight = image.size.height; float viewWidth = mCGRect.size.width; float viewHidth = mCGRect.size.height; CGRect rect; if(centerBool)     rect = CGRectMake((imgWidth-viewWidth)/2,(imgHeight-viewHidth)/2,viewWidth,viewHidth); else{     if(viewHidth
    
     0)             {                 rect = CGRectMake(x,0,  width, imgHeight);             }else             {                 rect =  CGRectMake(0,  0,  imgWidth, imgWidth*viewHidth/viewWidth);             }         }     }else     {         if(imgWidth <= imgHeight)         {             float height = viewHidth*imgWidth/viewWidth;             if(height< imgHeight)             {                 rect =CGRectMake(0,  0, imgWidth, height);             }else             {                 rect = CGRectMake(0,  0,viewWidth*imgHeight/viewHidth, imgHeight);             }         }else         {             float width = viewWidth*imgHeight/viewHidth;             if(width< imgWidth)             {                 float x =  (imgWidth - width)/2;                 rect =CGRectMake(x,  0,width, imgHeight);             }else             {                 rect =CGRectMake(0,  0,imgWidth, imgHeight);             }         }     } }  CGImageRef subImageRef = CGImageCreateWithImageInRect(image.CGImage,rect); CGRect smallBounds =CGRectMake(0, 0,CGImageGetWidth(subImageRef),CGImageGetHeight(subImageRef));  UIGraphicsBeginImageContext(smallBounds.size); CGContextRef context =UIGraphicsGetCurrentContext();CGContextDrawImage(context, smallBounds, subImageRef); UIImage *smallImage =[UIImage imageWithCGImage:subImageRef]; UIGraphicsEndImageContext();  return smallImage;}
    

70、跳转APPstore

//APPid就是上面的那串数字NSString  *urlStr = [NSString stringWithFormat:@"itms-apps://itunes.apple.com/app/id%@",APPID];NSURL *url = [NSURLURLWithString:urlStr];[[UIApplicationsharedApplication]openURL:url];

71、 获取本机APP 版本号

#pragma mark --  //获取本地版本号     //获取本地版本号     NSString* thisVersion = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleShortVersionString"];

72、获取APP store 项目版本号

#pragma mark -- 获取appstore版本号-(void)Postpath:(NSString *)path{NSString *url = [[NSString alloc] initWithFormat:@"http://itunes.apple.com/lookup?id=%@",@"414478124"];NSURL *url = [NSURL URLWithString:path];NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url                                                       cachePolicy:NSURLRequestReloadIgnoringCacheData                                                   timeoutInterval:10];[request setHTTPMethod:@"POST"];NSOperationQueue *queue = [NSOperationQueue new];[NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse *response,NSData *data,NSError *error){    NSMutableDictionary *receiveStatusDic=[[NSMutableDictionary alloc]init];    if (data) {                NSDictionary *receiveDic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];        if ([[receiveDic valueForKey:@"resultCount"] intValue]>0) {                        [receiveStatusDic setValue:@"1" forKey:@"status"];            [receiveStatusDic setValue:[[[receiveDic valueForKey:@"results"] objectAtIndex:0] valueForKey:@"version"]   forKey:@"version"];        }else{                        [receiveStatusDic setValue:@"-1" forKey:@"status"];        }    }else{        [receiveStatusDic setValue:@"-1" forKey:@"status"];    }        [self performSelectorOnMainThread:@selector(receiveData:) withObject:receiveStatusDic waitUntilDone:NO];}];  }  -(void)receiveData:(id)sender  {  NSLog(@"receiveData=%@",sender);  //打印获取到的版本号}

73、取消所有响应者（关闭所有键盘）

//取消窗口第一响应[[[UIApplication sharedApplication] keyWindow] endEditing:YES];

74、加载html时候 让大图不超出屏幕

//css 控制//js 控制- (void)webViewDidFinishLoad:(UIWebView *)webView{    [webView stringByEvaluatingJavaScriptFromString:     @"var script = document.createElement('script');"     "script.type = 'text/javascript';"     "script.text = /"function ResizeImages() { "         "var myimg,oldwidth,oldheight;"         "var maxwidth=320;"// 图片宽度         "for(i=0;i  maxwidth){"         "myimg.width = maxwidth;"         "}"         "}"         "}/";"         "document.getElementsByTagName('head')[0].appendChild(script);"];         [webView stringByEvaluatingJavaScriptFromString:@"ResizeImages();"];     }

75、监听textfiled的输入情况

#pragma mark   UITextField   ----监听[timesField addTarget:self               action:@selector(textFieldDidChange:)     forControlEvents:UIControlEventEditingChanged]; // 监听事件监听事件:// 监听改变按钮- (void) textFieldDidChange:(UITextField*) textField {       }

 

76、页面跳转返回按钮的文字

///设置push 之后返回按钮的 字体UIBarButtonItem *backbutton = [[UIBarButtonItem alloc]init];backbutton.title = @"";self.navigationItem.backBarButtonItem = backbutton;

77、/跳转之后隐藏  返回键

life.navigationItem.hidesBackButton = YES;

78、计算webview的高

- (void)webViewDidFinishLoad:(UIWebView *)aWebView {    CGRect frame = aWebView.frame;    frame.size.height = 1;    aWebView.frame = frame;    CGSize fittingSize = [aWebView sizeThatFits:CGSizeZero];    frame.size = fittingSize;    aWebView.frame = frame;    NSLog(@"size: %f, %f", fittingSize.width, fittingSize.height);}

79、设置阴影

#pragma mark  //设置 阴影    [[self.calendarView layer] setShadowOffset:CGSizeMake(0, 0)];    [[self.calendarView  layer] setShadowRadius:3];    [[self.calendarView  layer] setShadowOpacity:0.4] ;    [[self.calendarView  layer] setShadowColor:[UIColor blackColor].CGColor];

80、对键盘的监听

#pragma mark 键盘监听[[NSNotificationCenter defaultCenter] addObserver:self                                          selector:@selector(keyboardWasShown:)                                              name:UIKeyboardWillShowNotification object:nil];//注册键盘消失的通知[[NSNotificationCenter defaultCenter] addObserver:self                                          selector:@selector(keyboardWillBeHidden:)                                              name:UIKeyboardWillHideNotification object:nil];- (void)keyboardWasShown:(NSNotification*)aNotification{        //键盘高度    NSDictionary *userInfo = [aNotification userInfo];    //NSLog(@"%@",userInfo);    NSValue *aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];    CGRect keyboardRect = [aValue CGRectValue];    NSInteger height = keyboardRect.size.height;        CGFloat time = [[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];    }-(void)keyboardWillBeHidden:(NSNotification*)aNotification{        }

81、禁止webview 滚动

#pragma mark //禁止微webview 上下拖动UIWebView * d_intro = [[UIWebView alloc] init];d_intro.delegate = self;d_intro.dataDetectorTypes = UIDataDetectorTypeLink;//取消右侧，下侧滚动条，去处上下滚动边界的黑色背景d_intro.backgroundColor=[UIColor clearColor];for (UIView *_aView in [d_intro subviews]){    if ([_aView isKindOfClass:[UIScrollView class]])    {        [(UIScrollView *)_aView setShowsVerticalScrollIndicator:NO];        //右侧的滚动条                [(UIScrollView *)_aView setShowsHorizontalScrollIndicator:NO];        //下侧的滚动条                for (UIView *_inScrollview in _aView.subviews)        {            if ([_inScrollview isKindOfClass:[UIImageView class]])            {                _inScrollview.hidden = YES;  //上下滚动出边界时的黑色的图片            }        }    }}[self.view addSubview:d_intro];

82、图片保存本地沙盒、

#pragma mark 图片保存沙盒- (void)setHeadBgImage{    BOOL success;    NSFileManager *fileManager = [NSFileManager defaultManager];    //NSError *error;    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);    NSString *documentsDirectory = [paths firstObject];    NSString *imageFilePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"selfPhoto%d.jpg", [LoginManager sharedManager].userBasicInfo.uid]];    success = [fileManager fileExistsAtPath:imageFilePath];    UIImage *image1 = nil;    if ([LoginManager sharedManager].loginSucess) {        if (success) {            NSData *data = [fileManager contentsAtPath:imageFilePath];            image1 = [UIImage imageWithData:data];        }    }else{        image1 = [UIImage imageNamed:@"account_head_bg"];    }    // NSLog(@"%@-%u",imageFilePath,success);        [self setHeadBGImage:image1];}- (void)saveImage:(UIImage *)image{    BOOL success;    NSFileManager *fileManager = [NSFileManager defaultManager];    NSError *error;    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);    NSString *documentsDirectory = [paths firstObject];    NSString *imageFilePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"selfPhoto%d.jpg", [LoginManager sharedManager].userBasicInfo.uid]];    success = [fileManager fileExistsAtPath:imageFilePath];    if (success) {        success = [fileManager removeItemAtPath:imageFilePath error:&error];    }    BOOL result = [UIImagePNGRepresentation(image)writeToFile: imageFilePath    atomically:YES]; // 保存成功会返回YES    //UIImage *smallImage = [self thumbnailWithImageWithoutScale:image size:CGSizeMake(self.view.frame.size.width, 315)];    NSLog(@"%@-%u",imageFilePath,result);        [self setHeadBGImage:image];}

83、图片旋转360度

#pragma mark //旋转360 度 动画-(void) startAnimation{    [UIView beginAnimations:nil context:nil];    [UIView setAnimationDuration:0.01];    [UIView setAnimationDelegate:self];    [UIView setAnimationDidStopSelector:@selector(endAnimation)];    _rechargeCover.transform = CGAffineTransformMakeRotation(angle * (M_PI / 180.0f));    NSLog(@"%f",angle * (M_PI / 180.0f));    [UIView commitAnimations];    }-(void)endAnimation{    angle += 10;    if (angle < 360) {        [self startAnimation];    }    }

84、常用宏

#define DeviceMaxHeight ([UIScreen mainScreen].bounds.size.height)#define DeviceMaxWidth ([UIScreen mainScreen].bounds.size.width)#define widthRate DeviceMaxWidth/320#define IOS8 ([[UIDevice currentDevice].systemVersion intValue] >= 8 ? YES : NO)// RGB颜色#define UIColorFromRGB1(r, g, b) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:1.0]#define UIColorFromRGB(rgbValue) [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]

85、获取故事版的 vc

UIStoryboard *login = [UIStoryboard storyboardWithName:@"LoginModule" bundle:nil];AlsNoticeController* alsNoticeController = [login instantiateViewControllerWithIdentifier:@"LoginVC"];[self.navigationController pushViewController:alsNoticeController animated:YES];

 

86、设置windows覆盖层

#pragma mark  //设置覆盖层视图if (![[NSUserDefaults standardUserDefaults] boolForKey:@"guideFirst"])  {    _guideCoverView =[[UIView alloc]initWithFrame:self.view.bounds];    _guideCoverView.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.6];    UIWindow* currentWindow = [UIApplication sharedApplication].keyWindow;    [currentWindow addSubview:_guideCoverView];    }

87、设置透明度并且不影响子视图

#pragma mark 视图透明度 不影响子视图alterView.backgroundColor=[[UIColor whiteColor] colorWithAlphaComponent:1];

88、剪切板的复制

#pragma mark 复制到系统剪切版UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];pasteboard.string = self.label.text;

89、cocoPods常用指令

#pragma mark cocosPods指令pod install --verbose --no-repo-updatepod list  列出所有可用的第三方库pod search query 搜包含query的第三方库   注意:这两个命令只搜存在于本地 /Users/yohunl/.cocoapods/ 下的文件如果搜索网络的,可以先更新本地  pod repo update master,然后再搜索pod lib create frameworkName  创建一个framework工程pod lib lint 验证一个podspec文件是否有错误podinstall --no-repo-update错误 这里的参数—no-repo-update,是告诉cocoapods不要更新repo.有么有感觉每次pod install都很慢,那是因为每一次都会先更新本地的repo,加上此参数,就跳过了这个过程,将会很快pod init 可以建立一个空的podfile建立pod的spec文件   pod spec create spec名字  http://www.theonlylars.com/blog/2013/01/20/cocoapods-creating-a-pod-spec/pod install 命令时会引发许多操作。要想深入了解这个命令执行的详细内容，可以在这个命令后面加上 --verbose

 90、背景图片按照某个像素拉伸

self.messageImage.image = [[UIImage imageNamed:@"bbs_meaasge_frame"] stretchableImageWithLeftCapWidth:150 topCapHeight:20];