如何通过旋转正确设置子视图中心点的动画
我有两个 UIViews（A 和 B）作为 subviews 添加到 UIViewcontroller Main View （超级视图） 。
我正在尝试对View A进行动画处理（缩放/旋转/移动中心点到View B）。如果我进行缩放/旋转，动画就会很流畅。如果我只做中心点，动画就会很流畅。但是，当我尝试包括更改 View A 的中心点、旋转和缩放时，View A 的中心点动画是即时且不稳定的，但是旋转/缩放很顺利。
这是我的动画块：
[UIView animateWithDuration:2.0
animations:^ {
self.customView.frame = CGRectMake(self.containerSubview.frame.origin.x, self.containerSubview.frame.origin.y, 200, 300);
self.containerSubview.alpha = 0.2;
self.customView.transform = CGAffineTransformConcat(CGAffineTransformMakeRotation(M_PI / 2), CGAffineTransformMakeScale(1.5, 1.5));
self.customView.center = self.containerSubview.center;
}
completion:^(BOOL finished) {
NSLog(@"center point: %@", NSStringFromCGPoint(self.customView.center));
}
];
I have two UIViews (A and B) are added as subviews to a UIViewcontroller Main View (the superview).
I am trying to animate View A (scale/rotate/move center point to that of View B). If I do the scale/rotate the animation is smooth. If I just do the center point the animation is smooth. However, when I try to include changing the center point, rotation and scaling of View A then View A's center point animation is instant and jerky, but the rotation/scaling is smooth.
Here is my animation block:
[UIView animateWithDuration:2.0
animations:^ {
self.customView.frame = CGRectMake(self.containerSubview.frame.origin.x, self.containerSubview.frame.origin.y, 200, 300);
self.containerSubview.alpha = 0.2;
self.customView.transform = CGAffineTransformConcat(CGAffineTransformMakeRotation(M_PI / 2), CGAffineTransformMakeScale(1.5, 1.5));
self.customView.center = self.containerSubview.center;
}
completion:^(BOOL finished) {
NSLog(@"center point: %@", NSStringFromCGPoint(self.customView.center));
}
];
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（1）
当涉及到转换时，我应该更仔细地阅读文档。由于变换取决于视图的中心点。我无法在 uiview 级别同时发生修改变换和中心的动画。由于中心是变换的依赖项，因此必须立即设置，然后才能发生其余的动画。
解决方案是在视图层设置动画。使用组动画，我能够制作动画：中心点、缩放和旋转。
博客和示例项目即将推出。
I should have read the documentation more carefully when it comes to transforms. Since transforms are dependent on a view's center point. I can't have simultaneous animations occurring modifying a transform and center, at the uiview level. Since the center is a dependency for a transform it has to be set immediately and then the rest of the animations can occur.
The solution was to animate at a view's layer. Using group animations I was able to animate: the center point, scaling and rotation.
Blog and sample project to come shortly.