ios - 只检测从右到左的旋转手势

Question

我能够检测到旋转手势，但我只需要检测从右到左的那个。

如果有任何帮助，我将不胜感激。

谢谢!

Answer 1

我假设您正在使用 UIRotationGestureRecognizer 来检测旋转。你应该有这样的东西:

UIRotationGestureRecognizer *gestureRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(gestureRecognizerAction:)];
[self.view addGestureRecognizer:gestureRecognizer];

和:

- (void)gestureRecognizerAction:(UIRotationGestureRecognizer *)gestureRecognizer
{
  if (gestureRecognizer.rotation > 0) {
     //rotation in one side - lets say from left to right
  } else {
     //rotation in other side - lets say from right to left
  }
}

通过这种方式，您将只能检测到从右到左的旋转。