手勢識別器不能在子視圖上工作

Question

首先，我將UISwipeGestureRecognizer附加到圖像視圖，操作方法無法觸發。然後，我將UISwipeGestureRecognizer附加到視圖控制器的視圖中，它運行良好。我不知道爲什麼。 這裏是行不通的代碼

- (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]; 
} 

這裏是行之有效

- (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的代碼：

imageView.userInteractionEnabled = YES; 

Answer 2

試試這個 [imageView setUserInteractionEnabled:YES];