获取在Cocoa Touch中的滑动方向 [英] Get swipe direction in Cocoa Touch

问题描述

我试图抓住一个手势，但它不工作。这是我的代码：

  UISwipeGestureRecognizer * 
 recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget：self action：@selector（handleSwipeFrom :)]; 
 [recognizer setDirection：（UISwipeGestureRecognizerDirectionRight | UISwipeGestureRecognizerDirectionLeft）]; 
 [[self view] addGestureRecognizer：recognizer]; 
 [识别器发布]; 
  

和

   - （void）handleSwipeFrom：（UISwipeGestureRecognizer *）recognizer {
 NSLog（@get gesture）; 
 if（recognizer.direction == UISwipeGestureRecognizerDirectionRight）{
 NSLog（@get gesture right）; 
} 
 if（recognizer.direction == UISwipeGestureRecognizerDirectionLeft）{
 NSLog（@get gesture Left）; 
} 
} 
  

它总是获得手势，但无法识别方向。我也尝试了 if（recognizer.direction）{NSLog（@get gesture）;} 它也工作，所以我不明白我犯了错误。 / p>

感谢您的帮助。

解决方案

UISwipeGestureRecognizer 。它的方向总是你所设置的（在这种情况下 UISwipeGestureRecognizerDirectionRight | UISwipeGestureRecognizerDirectionLeft ，或3）。

如果您要捕获左右滑动，以便区分两者，则必须为每个滑块设置单独的识别器。 Apple在其 SimpleGestureRecognizers示例中执行此操作， a>。

I am trying to catch a gesture but it does not work. Here is my code:

UISwipeGestureRecognizer *recognizer;
    recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];
    [recognizer setDirection:(UISwipeGestureRecognizerDirectionRight | UISwipeGestureRecognizerDirectionLeft)];
    [[self view] addGestureRecognizer:recognizer];
    [recognizer release]; 

and

-(void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer {
    NSLog(@"get gesture");
    if (recognizer.direction == UISwipeGestureRecognizerDirectionRight) {
        NSLog(@"get gesture right");
    }
    if (recognizer.direction == UISwipeGestureRecognizerDirectionLeft) {
        NSLog(@"get gesture Left");
    }
}

It always gets a gesture but does not recognize the direction. I also tried if(recognizer.direction){NSLog(@"get gesture");} and it also worked, so I do not understand where I made the mistake.

Thanks for any help.

解决方案

You're not using the UISwipeGestureRecognizercorrectly. Its direction is always going to be what you've set it to (in this case UISwipeGestureRecognizerDirectionRight | UISwipeGestureRecognizerDirectionLeft, or 3).

If you want to capture swipes left and right that you can differentiate between, you'll have to set up a separate recognizer for each. Apple does this in their SimpleGestureRecognizers sample.

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