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;
}