手势识别器不适用于子视图

Question

首先,我将UISwipeGestureRecognizer附加到图像视图,无法触发操作方法.然后我附加UISwipeGestureRecognizer来查看控制器的视图,它运行良好.我不知道为什么.这是不起作用的代码

 - (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    UISwipeGestureRecognizer *swipeRight=[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeRightAction)];
    swipeRight.direction=UISwipeGestureRecognizerDirectionRight;
    //imageView is an outlet of image view
    [imageView addGestureRecognizer:swipeRight];
}

这是运行良好的代码

- (void)viewDidLoad
    {
        [super viewDidLoad];
        // Do any additional setup after loading the view.

    UISwipeGestureRecognizer *swipeRight=[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeRightAction)];
    swipeRight.direction=UISwipeGestureRecognizerDirectionRight;
    //imageView is an outlet of image view
    [self.view addGestureRecognizer:swipeRight];
}

Answer 1

将此代码添加到imageView:

imageView.userInteractionEnabled = YES;