如何识别所有 4 个方向的滑动?

问题描述

我需要识别各个方向的滑动(上/下/左/右).不是同时，但我需要认出它们.

I need to recognize swipes in all directions (Up/Down/Left/Right). Not simultaneously, but I need to recognize them.

我试过了:

  UISwipeGestureRecognizer *Swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(SwipeRecognizer:)];
  Swipe.direction = (UISwipeGestureRecognizerDirectionLeft |
                     UISwipeGestureRecognizerDirectionRight |
                     UISwipeGestureRecognizerDirectionDown |
                     UISwipeGestureRecognizerDirectionUp);
  [self.view addGestureRecognizer:Swipe];
  [Swipe release];

但SwipeRecognizer

这是 SwipeRecognizer 的代码:

Here's the code for SwipeRecognizer:

- (void) SwipeRecognizer:(UISwipeGestureRecognizer *)sender {
  if ( sender.direction == UISwipeGestureRecognizerDirectionLeft )
    NSLog(@" *** SWIPE LEFT ***");
  if ( sender.direction == UISwipeGestureRecognizerDirectionRight )
    NSLog(@" *** SWIPE RIGHT ***");
  if ( sender.direction == UISwipeGestureRecognizerDirectionDown )
    NSLog(@" *** SWIPE DOWN ***");
  if ( sender.direction == UISwipeGestureRecognizerDirectionUp )
    NSLog(@" *** SWIPE UP ***");
}

我该怎么做?如何将所有不同的方向分配给我的 Swipe 对象?

How can I do this? How can assign to my Swipe object all different directions?

推荐答案

你这样设置方向

  UISwipeGestureRecognizer *Swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(SwipeRecognizer:)];
  Swipe.direction = (UISwipeGestureRecognizerDirectionLeft |
                     UISwipeGestureRecognizerDirectionRight |
                     UISwipeGestureRecognizerDirectionDown |
                     UISwipeGestureRecognizerDirectionUp);

这就是您收到回调时的方向，因此您的所有测试都失败是正常的.如果你有

That's what the direction will be when you get the callback, so it is normal that all your tests fails. If you had

- (void) SwipeRecognizer:(UISwipeGestureRecognizer *)sender {
  if ( sender.direction | UISwipeGestureRecognizerDirectionLeft )
    NSLog(@" *** SWIPE LEFT ***");
  if ( sender.direction | UISwipeGestureRecognizerDirectionRight )
    NSLog(@" *** SWIPE RIGHT ***");
  if ( sender.direction | UISwipeGestureRecognizerDirectionDown )
    NSLog(@" *** SWIPE DOWN ***");
  if ( sender.direction | UISwipeGestureRecognizerDirectionUp )
    NSLog(@" *** SWIPE UP ***");
}

测试会成功(但都会成功，所以你不会从中得到任何信息).如果您想区分不同方向的滑动，您将需要单独的手势识别器.

The tests would succeed (but the would all succeed so you wouldn't get any information out of them). If you want to distinguish between swipes in different directions you will need separate gesture recognizers.

正如评论中所指出的，请参阅此答案.显然，即使这样也行不通.您应该创建只有一个方向的滑动，以使您的生活更轻松.

As pointed out in the comments, see this answer. Apparently even this doesn't work. You should create swipe with only one direction to make your life easier.

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