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[英]iPhone iOS how to make UIScrollView work with UIRotationGestureRecognizer when zooming is enabled?
[英]iPhone iOS how to make UIRotationGestureRecognizer and UIPinchGestureRecognizer to work together to scale and rotate a UIView with subviews?
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
手势外,一切正常。 更具体地说,它不适用于UIPinchGestureRecognizer
手势。
通常这两个手势竞争两个手指触摸,所以我正在并行运行它们。 以下是手势识别器调用的两种方法。
在进行旋转手势时, 视图在其中心周围旋转 ,其高度和宽度如下所示:高度变为宽度,宽度慢慢变为高度。 最终,视图消失了。
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,具有自动调整蒙版的子视图会消失。 子视图具有高度和宽度弹簧和左/顶部支柱。
我究竟做错了什么? 如何用手势调整和缩放UIView?
所有委托方法和连接都已正确设置。 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);
}
如果您希望两个gestureRecognisers
并行(同时)运行,您的view
应该实现<UIGestureRecognizerDelegate>
。
此外,您应该使它成为两个gestureRecognizers
的委托。
rotationGestureRecognizer.delegate=self;
pinchGestureRecognizer.delegate=self;
你还应该实现shouldRecognizeSimultaneouslyWithGestureRecognizer:
方法:
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
return YES;
}
注意:如果您在view
有更多这两个gestureRecognisers
,则必须在此方法中添加一些身份检查。
编辑:
刚刚找到了Ole Begemann关于这个主题的文章: iOS上的手势识别,注重细节
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