起初,我将UISwipeGestureRecognizer附加到一个图片视图上,但是动作方法无法触发。然后我将UISwipeGestureRecognizer附加到视图控制器的视图上,它可以正常工作。我不知道原因。
这里是不起作用的代码: - (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];
}
这里是运行良好的代码
- (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];
}