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-(void)p_GetJsonContent{
    NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
    AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];
    
    NSURL *URL = [NSURL URLWithString:@"https://raw.githubusercontent.com/lovekarri/exercise/master/content.json"];
    NSURLRequest *request = [NSURLRequest requestWithURL:URL];
    
    NSURLSessionDownloadTask *downloadTask = [manager downloadTaskWithRequest:request progress:nil destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {
        NSURL *documentsDirectoryURL = [[NSFileManager defaultManager] URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:NO error:nil];
        return [documentsDirectoryURL URLByAppendingPathComponent:[response suggestedFilename]];

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-(void)initUIImageView{
    UIImageView imageView = [[UIImageView alloc] init];
    imageView.userInteractionEnabled = YES;
    
    UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapImageView:)]
    [imageView addGestureRecognizer:tapGestureRecognizer];
}

-(void)tapImageView:(UITapGestureRecognizer*)sender{
    //doSomething

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//在这里我需要给UITableViewCell添加长按手势，非重点代码我将省略
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    //...
    UILongPressGestureRecognizer *longPressGestureRecognizer = [[UILongPressGestureRecognizer alloc]  initWithTarget:cell action:@selector(longPressDoSomething:)];
    [cell addGestureRecognizer:longPressGestureRecognizer];
    //...
    return cell;
}

-(void)longPressDoSomething:(UILongPressGestureRecognizer*)sender{

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-(void)initSwipeGestureRecognizer{
       UISwipeGestureRecognizer *swipeGestureRecognizer=[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)]; 
       [self.view addGestureRecognizer:swipeGestureRecognizer];
}

-(void)swipe:(UISwipeGestureRecognizer*)sender{
      switch(sender.direction){
        case UISwipeGestureRecognizerDirectionRight:  
        {  
            break;  

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-(void)initUIPinchGestureRecognizer{
       UIPinchGestureRecognizer *pinchGestureRecognizer=[[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector:(pinchHandle:)];
       [self.view addGestureRecognizer:pinchGestureRecognizer];
}

-(void)pinchHandle:(UIPinchGestureRecognizer*)sender{
     CGFloat scale = sender.scale;//缩放比例
}

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UIRotationGestureRecognizer *rotationGestureRecognizer =
  [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationHandle:)];
[[self view] addGestureRecognizer:rotationGestureRecognizer];

-(void)rotationHandle:(UIRotationGestureRecognizer*)sender{
       CGFloat *rotation = sender.rotation;//旋转弧度
}

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-(void)initUICollectionView{
    //初始化布局方式，这里采用垂直布局。
    UICollectionViewFlowLayout *flowLayout=[[UICollectionViewFlowLayout alloc] init];
    [flowLayout setScrollDirection:UICollectionViewScrollDirectionVertical];
    
    UICollectionView *collectionView=[[UICollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:flowLayout];
    [self.view addSubview:collectionView];
}

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//返回有多少个Section,该方法和UITableView的一样
-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{
    return 1;
}

//返回每个Section有多少rows
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
    return 1;
}

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//...

-(void)viewDidLoad{
    [super viewDidLoad];
    NumberField *numberField=[[NumberField alloc] initWithFrame:CGRectMake(100, 100, 120, 44)];
    numberField.placeholder=@"只能输入数字";
    
    //设置精度,长度为10，小数点位数为4的苏子。
    numberField.numeric=CGNumeric(10, 4);

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-(void)initControls{
    _contentLabel=[UILabel new];
    _contentLabel.translatesAutoresizingMaskIntoConstraints=NO;
    _contentLabel.numberOfLines=0;
    _contentLabel.lineBreakMode=NSLineBreakByWordWrapping;
    [self.contentView addSubview:_contentLabel];
}