iOS 单击手势和双击手势共存问题

- (void)viewDidLoad

{

    [super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

    UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(100, 200, 110, 200)];

    imageView.contentMode = UIViewContentModeScaleAspectFit;

    [imageView setImage:[UIImage imageNamed:@"xxx.bundle/1.jpg"]];

    imageView.userInteractionEnabled = YES;

    [self.view addSubview:imageView];

    

    UITapGestureRecognizer *singleTapGestureRecognizer = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(singleTap:)];

    [singleTapGestureRecognizer setNumberOfTapsRequired:1];

    [imageView addGestureRecognizer:singleTapGestureRecognizer];

    

    UITapGestureRecognizer *doubleTapGestureRecognizer = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(doubleTap:)];

    [doubleTapGestureRecognizer setNumberOfTapsRequired:2];

    [imageView addGestureRecognizer:doubleTapGestureRecognizer];

    

    //这行很关键，意思是只有当没有检测到doubleTapGestureRecognizer 或者 检测doubleTapGestureRecognizer失败，singleTapGestureRecognizer才有效

    [singleTapGestureRecognizer requireGestureRecognizerToFail:doubleTapGestureRecognizer];

}

- (void)singleTap:(UIGestureRecognizer*)gestureRecognizer

{

    NSLog(@"-----singleTap-----");

    [self.view setBackgroundColor:[UIColor redColor]];

}

- (void)doubleTap:(UIGestureRecognizer*)gestureRecognizer

{

    [self.view setBackgroundColor:[UIColor blueColor]];

    NSLog(@"-----doubleTap-----");

}