手勢識別器不適用於子視圖

Question

首先，我將UISwipeGestureRecognizer附加到圖像視圖，無法觸發操作方法。然后我附加UISwipeGestureRecognizer來查看控制器的視圖，它運行良好。我不知道為什么。 這是不起作用的代碼

 - (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];
}

這是運行良好的代碼

- (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

將此代碼添加到imageView：

imageView.userInteractionEnabled = YES;

Answer 2

試試這個[imageView setUserInteractionEnabled:YES];