为什么我的UIGestureRecognizer代码不起作用？

Question

为什么以下代码不起作用？

- (void)viewDidLoad
{    

UISwipeGestureRecognizer *oneFingerSwipeLeft = 
[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerSwipeLeft:)];
[oneFingerSwipeLeft setDirection:UISwipeGestureRecognizerDirectionLeft];
[[self view] addGestureRecognizer:oneFingerSwipeLeft];

UISwipeGestureRecognizer *oneFingerSwipeRight = 
[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerSwipeRight:)];
[oneFingerSwipeRight setDirection:UISwipeGestureRecognizerDirectionRight];
[[self view] addGestureRecognizer:oneFingerSwipeRight];

}

- (void)oneFingerSwipeLeft:(UISwipeGestureRecognizer *)recognizer 
{ 
CGPoint point = [recognizer locationInView:[self view]];
NSLog(@"Swipe up - start location: %f,%f", point.x, point.y);
}

- (void)oneFingerSwipeRight:(UISwipeGestureRecognizer *)recognizer 
{ 
CGPoint point = [recognizer locationInView:[self view]];
NSLog(@"Swipe down - start location: %f,%f", point.x, point.y);
}

请记住，我在裸视图前面有很多层（例如图像，按钮和标签）。这会有所作为吗？如何在所有这些图层之上识别手势？

谢谢！

Answer 1

仔细检查并确保您要添加UIGestureRecognizer，并将UserInteractionEnabled设置为YES。即。

[self.imageView setUserInteractionEnabled:YES];

Answer 2

你必须将子视图顶部的所有触摸传递到上一个视图..所以添加一个透明视图，然后将所有这些触摸传递给主视图，如线程中所述

Passing a touch event to all subviews of a View Controller