下面的代码正确地捏合/缩放容器视图,但只有在它跳转到1.0的标度之后.如何修改它以使容器视图从其当前比例缩放?
UIPinchGestureRecognizer *twoFingerPinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingerPinch:)]; [self.container addGestureRecognizer:twoFingerPinch]; - (void)twoFingerPinch:(UIPinchGestureRecognizer *)recognizer { _scale = recognizer.scale; CGAffineTransform tr = CGAffineTransformScale(self.view.transform,_scale,_scale); self.container.transform = tr; }
解决方法
在.h文件中,添加:
CGFloat _lastScale;
在.m文件中,
- (id)init { ... _lastScale = 1.0f; ... } - (void)twoFingerPinch:(UIPinchGestureRecognizer *)recognizer { if (recognizer.state == UIGestureRecognizerStateEnded) { _lastScale = 1.0f; return; } CGFloat scale = 1.0f - (_lastScale - recognizer.scale); CGAffineTransform tr = CGAffineTransformScale(self.view.transform,scale,scale); self.container.transform = tr; _lastScale = recognizer.scale; }
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