TouchMoved:withEvent: 和 UIRotationgestureRecognizer 不能一起工作
我正在尝试这两种方法来移动和旋转 UIView。两种方法都是分开工作的，但如果我旋转然后移动 UIView，它就会消失。
- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
CGRect rect = self.aView.frame;
UITouch *touch = [touches anyObject];
CGPoint pPoint = [touch previousLocationInView:self.view];
CGPoint cPoint = [touch locationInView:self.view];
float deltaX = cPoint.x - pPoint.x;
float deltaY = cPoint.y - pPoint.y;
rect.origin.x = rect.origin.x + deltaX;
rect.origin.y = rect.origin.y + deltaY;
self.aView.frame = rect;
}
- (void)rotate:(UIRotationGestureRecognizer *) recognizer {
CGFloat rotation = angle + recognizer.rotation;
NSLog(@"%f", angle * 180 / M_PI);
self.aView.transform = CGAffineTransformMakeRotation (rotation);
if (recognizer.state == UIGestureRecognizerStateEnded)
angle = rotation;
}
I'm trying these two methods to move and rotate an UIView. Both methods work separately but if I rotate and then move the UIView it disappears.
- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
CGRect rect = self.aView.frame;
UITouch *touch = [touches anyObject];
CGPoint pPoint = [touch previousLocationInView:self.view];
CGPoint cPoint = [touch locationInView:self.view];
float deltaX = cPoint.x - pPoint.x;
float deltaY = cPoint.y - pPoint.y;
rect.origin.x = rect.origin.x + deltaX;
rect.origin.y = rect.origin.y + deltaY;
self.aView.frame = rect;
}
- (void)rotate:(UIRotationGestureRecognizer *) recognizer {
CGFloat rotation = angle + recognizer.rotation;
NSLog(@"%f", angle * 180 / M_PI);
self.aView.transform = CGAffineTransformMakeRotation (rotation);
if (recognizer.state == UIGestureRecognizerStateEnded)
angle = rotation;
}
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手势识别器优先于 touchMoved，因此很难在同一视图中使用它们。
使用 UIPanGestureRecognizer 而不是 touchMoved 来处理 UIView 的拖动。 来使 UIPanGestureRecognizer 和 UIRotationGestureRecognizer 相互协作。
然后，您可以通过实现UIGestureRecognizerDelegate 协议中定义的方法
Gesture recognisers take priority over touchMoved, so it's hard to use them both with the same view.
Use a UIPanGestureRecognizer instead of touchMoved to handle dragging the UIView. You can then get the UIPanGestureRecognizer and UIRotationGestureRecognizer to cooperate with one another by implementing the
method, which is defined in the UIGestureRecognizerDelegate protocol.