图层位置在(核心)动画的开始处跳转 [英] Layer Position jumps at start of (Core) Animation
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问题描述
所以,我正在尝试创建一个平铺翻转效果,就像在Windows Phone 7上一样。
So, I'm trying to create a tile flipping effect, like on Windows Phone 7.
到目前为止,我有以下代码,但我有一对查询。
So far I have the following code, but I have a couple of queries.
CALayer *layer = self.theRedSquare.layer;
CATransform3D initialTransform = self.theRedSquare.layer.transform;
initialTransform.m34 = 1.0 / -1000;
[UIView beginAnimations:@"Scale" context:nil];
[UIView setAnimationDuration:1];
[UIView setAnimationCurve: UIViewAnimationCurveEaseInOut];
layer.transform = initialTransform;
layer.anchorPoint = CGPointMake(-0.3, 0.5);
CATransform3D rotationAndPerspectiveTransform = self.theRedSquare.layer.transform;
rotationAndPerspectiveTransform = CATransform3DRotate(rotationAndPerspectiveTransform, M_PI , 0 , -self.theRedSquare.bounds.size.height/2, 0);
layer.transform = rotationAndPerspectiveTransform;
[UIView setAnimationDelegate:self];
[UIView commitAnimations];
1。为什么我的红色方块(一个简单的UI视图)在动画开始时转换为右边?
2。对于锚点,是否可以在父视图上设置位置?目前我相对于当前视图任意设置它。
提前感谢任何指针。
动画前
动画期间(注意方块向右移动)
动画后(注意方块向右移动)
视频已添加:示例视频
推荐答案
-(void)setAnchorPoint:(CGPoint)anchorPoint forView:(UIView *)view
{
CGPoint newPoint = CGPointMake(view.bounds.size.width * anchorPoint.x, view.bounds.size.height * anchorPoint.y);
CGPoint oldPoint = CGPointMake(view.bounds.size.width * view.layer.anchorPoint.x, view.bounds.size.height * view.layer.anchorPoint.y);
newPoint = CGPointApplyAffineTransform(newPoint, view.transform);
oldPoint = CGPointApplyAffineTransform(oldPoint, view.transform);
CGPoint position = view.layer.position;
position.x -= oldPoint.x;
position.x += newPoint.x;
position.y -= oldPoint.y;
position.y += newPoint.y;
view.layer.position = position;
view.layer.anchorPoint = anchorPoint;
}
-(void)animateView:(UIView *)theRedSquare
{
CALayer *layer = theRedSquare.layer;
CATransform3D initialTransform = theRedSquare.layer.transform;
initialTransform.m34 = 1.0 / -1000;
[self setAnchorPoint:CGPointMake(-0.3, 0.5) forView:theRedSquare];
[UIView beginAnimations:@"Scale" context:nil];
[UIView setAnimationDuration:1];
[UIView setAnimationCurve: UIViewAnimationCurveEaseInOut];
layer.transform = initialTransform;
CATransform3D rotationAndPerspectiveTransform = theRedSquare.layer.transform;
rotationAndPerspectiveTransform = CATransform3DRotate(rotationAndPerspectiveTransform, M_PI , 0 , -theRedSquare.bounds.size.height/2, 0);
layer.transform = rotationAndPerspectiveTransform;
[UIView setAnimationDelegate:self];
[UIView commitAnimations];
}
取自This,稍加调整..希望它有助于
更改我的CALayer的anchorPoint移动视图
Taken from This, and slightly tweaked.. Hopefully it helps Changing my CALayer's anchorPoint moves the view
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