手势识别器在子视图上不起作用

Question

一开始，我将 UISwipeGestureRecognizer 附加到图像视图，无法触发动作方法。然后我将 UISwipeGestureRecognizer 附加到视图控制器的视图，效果很好。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;

Answer 2

试试这个 [imageView setUserInteractionEnabled:YES];