仅从右向左检测旋转手势

Question

我能够检测到旋转手势，但我只需要从右到左检测到一个。

我真的很感激任何帮助。

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，您只能检测从右到左的旋转。