如何识别所有4个方向的滑动？

Question

我需要识别所有方向的滑动(向上/向下/向左/向右).不是同时,但我需要认识到它们.

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];

但没有出现 SwipeRecognizer

这是SwipeRecognizer的代码:

- (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 ***");
}

我怎样才能做到这一点？如何为我的滑动对象分配所有不同的方向？

Answer 1

你设置这样的方向

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

当你得到回调时,这就是方向,所以你的所有测试都失败是正常的.如果你有

- (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).如果要区分不同方向的滑动,则需要单独的手势识别器.

编辑

正如评论中指出的那样,请看这个答案.显然即使这不起作用.您应该只使用一个方向创建滑动,以使您的生活更轻松.