iPhone iOS 如何使 UIRotationGestureRecognizer 和 UIPinchGestureRecognizer 一起工作来缩放和旋转带有子视图的 UIView？

我正在我的应用程序中实现拖/放/调整大小/旋转标签。到目前为止，除了UIRotationGestureRecognizer手势。更具体地说，它不适用于UIPinchGestureRecognizer手势。

通常，这两个手势会竞争两个手指触摸，因此我并行运行它们。以下是手势识别器调用的 2 个方法。

当做旋转手势时，视图疯狂旋转围绕它的中心，它的高度和宽度变化如下：高度变成宽度，宽度慢慢变成高度。最终，景象消失了。

在视图中，我有另一个自动调整大小的视图。通常，捏合手势也会自动调整子视图的大小，但在这种情况下，具有自动调整大小蒙版的子视图会消失。子视图具有高度和宽度弹簧以及左/顶部支柱。

我究竟做错了什么？如何使用手势调整和缩放 UIView 的大小？

所有委托方法和连接均已正确设置。我需要了解如何处理识别器应用缩放和旋转的顺序。

//makes 2 gesture recognizers behave together
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
    return YES;
}

- (IBAction)handleRotationFrom:(id)sender {
    NSLog(@"Gesture rotation %.1f", rotationGestureRecognizer.rotation);

//attempt to continuously rotate the label, starting with a remembered rotation    

    float rotation = atan2(activeCompanionLabelView.transform.b, activeCompanionLabelView.transform.a);
    NSLog(@"existing rotation %.1f", rotation);

//    rotation = rotation<0?(2*M_PI)-fabs(rotation):rotation;
    rotation +=rotationGestureRecognizer.rotation;

    NSLog(@"*** gesture rotation %.1f sum: %.1f, saved: %.1f",rotationGestureRecognizer.rotation, rotation, activeCompanionLabelView.savedRotation);
    activeCompanionLabelView.transform = CGAffineTransformMakeRotation((rotation));
    activeCompanionLabelView.savedRotation = rotation;
}

- (IBAction)handlePinch:(id)sender {
    NSLog(@"pinch %.2f", pinchGestureRecognizer.scale);

//resize, keeping the origin where it was before

    activeCompanionLabelView.frame = CGRectMake(activeLabelContainerFrame.origin.x, activeLabelContainerFrame.origin.y, activeLabelContainerFrame.size.width*pinchGestureRecognizer.scale, activeLabelContainerFrame.size.height*pinchGestureRecognizer.scale);    



}

如果你想要两个gestureRecognisers并行（同时）运行您的view应该实施<UIGestureRecognizerDelegate>.

另外，你应该让它成为两者的代表gestureRecognizers.

rotationGestureRecognizer.delegate=self;
pinchGestureRecognizer.delegate=self;

而且你还应该实施shouldRecognizeSimultaneouslyWithGestureRecognizer: method:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {

    return YES;
}

注意：如果您有更多则这两个gestureRecognisers在你的view你必须在这个方法中添加一些身份检查。

EDIT:

刚刚找到 Ole Begemann 关于此主题的文章：iOS 上注重细节的手势识别 http://oleb.net/blog/2012/01/gesture-recognition-on-ios-with-attention-to-detail/