一些工作中用到的方法，会持续更新
使用方法：对照目录按标题进行搜索（Command+f）

目录

• 文本框输入时使当前TextField移动到弹出的键盘顶部
• 判断是否为正确的手机号码
• 判断当前版本号
• 使用SDWebImage当收到内存警告时清除缓存
• KVO模式监听数组的变化
• ScrollView及其子类下拉放大头部图片

文本框输入时使当前TextField移动到弹出的键盘顶部

//首先先设置TextField的代理为self，并添加<UITextFieldDelegate>
//然后通过代理方法来处理视图的上下移动

#pragma mark - TextField delegete 处理键盘弹出时视图的上下移动
//键盘上移
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    CGRect frame = textField.frame;
    CGFloat heights = self.view.frame.size.height;
    // 当前点击textfield的坐标的Y值 + 当前点击textFiled的高度 - （屏幕高度- 键盘高度 - 键盘上tabbar高度）
    // 在这一部 就是了一个 当前textfile的的最大Y值 和 键盘的最全高度的差值，用来计算整个view的偏移量
    int offset = frame.origin.y + frame.size.height - ( heights - 216.0-49.0);//键盘高度216
    NSTimeInterval animationDuration = 0.30f;
    [UIView beginAnimations:@"ResizeForKeyBoard" context:nil];
    [UIView setAnimationDuration:animationDuration];
    float width = self.view.frame.size.width;
    float height = self.view.frame.size.height;
    if(offset > 0)
    {
        CGRect rect = CGRectMake(0.0f, -offset,width,height);
        self.view.frame = rect;
    }
    [UIView commitAnimations];
}

//屏幕恢复原样
-(void)textFieldDidEndEditing:(UITextField *)textField
{
    //滑动效果
    NSTimeInterval animationDuration = 0.30f;
    [UIView beginAnimations:@"ResizeForKeyboard" context:nil];
    [UIView setAnimationDuration:animationDuration];
    //恢复屏幕
    self.view.frame = CGRectMake(0.0f, 0.0f, self.view.frame.size.width, self.view.frame.size.height);//64-216
    [UIView commitAnimations];
}

//return返回
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    [self.contentView endEditing:YES];
    return YES;
}

判断是否为正确的手机号码

#pragma mark - 判断用户输入的手机号码是否正确
- (BOOL)isMobileNumber:(NSString *)mobileNum {
    
    //    电信号段:133/153/180/181/189/177
    //    联通号段:130/131/132/155/156/185/186/145/176
    //    移动号段:134/135/136/137/138/139/150/151/152/157/158/159/182/183/184/187/188/147/178
    //    虚拟运营商:170
    
    NSString *MOBILE = @"^1(3[0-9]|4[57]|5[0-35-9]|8[0-9]|7[06-8])\\d{8}$";
    NSPredicate *regextestmobile = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", MOBILE];
    return [regextestmobile evaluateWithObject:mobileNum];
}

/*
        case let .email(str):
            predicateStr = "^([a-z0-9_\\.-]+)@([\\da-z\\.-]+)\\.([a-z\\.]{2,6})$"
            currObject = str
        case let .phoneNum(str):
            predicateStr = "^((13[0-9])|(15[^4,\\D]) |(17[0,0-9])|(18[0,0-9]))\\d{8}$"
            currObject = str
        case let .carNum(str):
            predicateStr = "^[A-Za-z]{1}[A-Za-z_0-9]{5}$"
            currObject = str
        case let .username(str):
            predicateStr = "^[A-Za-z0-9]{6,20}+$"
            currObject = str
        case let .password(str):
            predicateStr = "^[a-zA-Z0-9]{6,20}+$"
            currObject = str
        case let .nickname(str):
            predicateStr = "^[\\u4e00-\\u9fa5]{4,8}$"
            currObject = str
        case let .URL(str):
            predicateStr = "^(https?:\\/\\/)?([\\da-z\\.-]+)\\.([a-z\\.]{2,6})([\\/\\w \\.-]*)*\\/?$"
            currObject = str
        case let .IP(str):
            predicateStr = "^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$"
            currObject = str
        }
*/

判断当前版本号

业务逻辑：从服务器获得最新的版本号和是否要强制更新的字段，当用户版本与服务器版本不同时，弹出警告框让用户更新，若用户点击确定则跳转到appStore下载，点击取消则判断服务器返回的强制更新字段是否有值，有则关闭app不让用户使用(当后台接口改变时会出现这种情况)

#pragma mark - 判断版本号
- (void)getVersion{
      //通过发送网络请求从服务器上获取最新版本号
[manager GET:kGetVersion parameters:parameters progress:nil success:^(NSURLSessionDataTask * _Nonnull task, NSDictionary *responseObject) {
        //得到服务器版本
        NSString *updataVersion = responseObject[@"currVesion"];
        //获取当前设备中应用的版本号
        NSDictionary *infoDic = [[NSBundle mainBundle] infoDictionary];
        NSString *currentVersion = [infoDic objectForKey:@"CFBundleShortVersionString"];
        //判断两个版本是否相同
        if ([updataVersion compare:currentVersion options:NSNumericSearch] == NSOrderedDescending) {
            UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"更新" message:@"您当前版本过低，请更新" preferredStyle:UIAlertControllerStyleAlert];
            UIAlertAction *update = [UIAlertAction actionWithTitle:@"更新" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
                //跳转到响应地址进行更新
                //appID根据上传的应用取得
                NSString *appID = @"114XXXXXXX";
                NSString *appUrl = @"http://itunes.apple.com/lookup?id=";
                NSString *urlStr = [NSString stringWithFormat:@"%@%@", appUrl, appID];
                NSURL *url = [NSURL URLWithString:urlStr];
                //                    NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"http://%@",infoDict[@"currVesionDetail"]]];
                [[UIApplication sharedApplication] openURL:url];
            }];
            UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
                //判断是否要强制更新
                if (responseObject[@"checkVesion"]) {
                    //说明要强制更新，则杀死程序
                    UIApplication *app = [UIApplication sharedApplication];
                    UIWindow *window = app.keyWindow;
                    [UIView animateWithDuration:1.0f animations:^{
                        window.alpha = 0;
                        window.frame = CGRectMake(0, window.bounds.size.width, 0, 0);
                    } completion:^(BOOL finished) {
                        exit(0);
                    }];
                    //exit(0);
                    
                }
            }];
            [alert addAction:update];
            [alert addAction:cancel];
            
            [self presentViewController:alert animated:YES completion:nil];
        }
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        
    }];
}

使用SDWebImage当收到内存警告时清除缓存

- (void)applicationDidReceiveMemoryWarning:(UIApplication *)application
{
    SDWebImageManager *mrg = [SDWebImageManager sharedManager];
    //1,取消下砸操作
    [mrg cancelAll];
    //2,清除内存缓存
    [mrg.imageCache clearMemory];
}

KVO模式监听数组的变化

- (void)viewDidLoad{
    ....
    [self addObserver:self forKeyPath:@"array" options:NSKeyValueObservingOptionNew context:nil];
    ...
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context{
    //实现监听方法
}

这样监听是无效的，必须要实现以下方法

//注意，方法名中inArrayAtIndex,其中Array要根据属性名和改变
-(void)insertObject:(id)object inArrayAtIndex:(NSUInteger)index{
    //向数组中插入数据
    [self.array insertObject:object atIndex:index];
}
-(void)removeObjectFromArrayAtIndex:(NSUInteger)index{
    //向数组中删除数据
    [self.array removeObjectAtIndex:index];
}

当要往数组上增加/删除数据，要通过上面两个方法，而不是直接使用self.array addObject：添加
更多方法如下

-(void)insertArray:(NSArray *)array atIndexes:(NSIndexSet *)indexes{}
-(void)removeArrayAtIndexes:(NSIndexSet *)indexes{}
-(void)replaceArrayAtIndexes:(NSIndexSet*)indexes withArray:(NSArray *)array{}
-(void)replaceObjectInArrayAtIndex:(NSUInteger)index withObject:(id)object{}

ScrollView及其子类下拉放大头部图片

原理:让ScrollView顶部缩进要放的headerView的高度,在拖动ScrollView时,保持headerView的y始终在原位,而高度加上偏移值

- (void)viewDidLoad {
  ...
  //设置tableView的缩进
  tableView.contentInset = UIEdgeInsetsMake(headerViewHeight, 0, 0, 0);
  //设置headerView
  imageView.frame = CGRectMake(0, -headerViewHeight, self.view.frame.size.width, headerViewHeight);
  imageView.contentMode = UIViewContentModeScaleAspectFill;
  //将imageView插入到tableView的最上层,盖住空白处
  [self.tableView insertSubview:imageView atIndex:0];
  ...
}

#pragma mark - delegate
//偏移改变headerView大小
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    CGFloat y = scrollView.contentOffset.y ; //如果有导航栏则要加上64
    if (y< -headerViewHeight) {
        CGRect frame = self.headerView.frame;
        frame.origin.y = y;
        frame.size.height = -y;
        self.headerView.frame = frame;
    }
}

拉伸头部视图.gif