iOS UIView 动画 CATransform3DMakeRotation 混淆
我有一个 UIView，我正在尝试将其向下翻转，同时将其轴置于视图底部。例如：
为此，我尝试使用 UIView 动画：
[UIView animateWithDuration:3 delay:0 options:UIViewAnimationCurveEaseOut animations:^{
// Flip Down
top3.layer.anchorPoint = CGPointMake(0.5, 1.0);
top3.layer.transform = CATransform3DMakeRotation(M_PI, 1, 0, 0);
} completion:^(BOOL finished) {
// Reset?
//top3.transform = CGAffineTransformMakeScale(1, 1);
}];
现在它不起作用如我所愿，视图似乎正在远离用户而不是朝向用户。它似乎没有提供 3D 效果，使其在向下旋转时看起来更接近用户，如我的图片所示。我确信这是因为我缺乏了解如何使用 CATransform3DMakeRotation 。
问题：
- 如何让视图在下降时看起来更靠近用户？比如像我的图像示例中那样倾斜它？
- 当我设置
anchorPoint时，它会将我的视图向下移动，如何防止这种情况发生并仍然设置我的anchorPoint？ 对于在选项中使用了UIView动画，我可以使用缓动设置吗？UIViewAnimationCurveEaseOut。- 我可以使用重力设置吗？
I have a UIView that I am trying to animate flipping down, while having its axis at the bottom of the view. E.g.:
To do this, I am trying to use a UIView animation:
[UIView animateWithDuration:3 delay:0 options:UIViewAnimationCurveEaseOut animations:^{
// Flip Down
top3.layer.anchorPoint = CGPointMake(0.5, 1.0);
top3.layer.transform = CATransform3DMakeRotation(M_PI, 1, 0, 0);
} completion:^(BOOL finished) {
// Reset?
//top3.transform = CGAffineTransformMakeScale(1, 1);
}];
Right now it isn't working how I want, it seems like the view is animating AWAY from the user rather then toward. It does't seem to give a 3D effect that makes it look closer to the user when rotating down, as shown in my image. I am positive that this is because of my lack of understanding how to use CATransform3DMakeRotation.
Questions:
- How can I make the view appear closer to the user as it drops? Such as skewing it as in my image example?
- When I set my
anchorPointit shifts my view down, how can I prevent this and still set myanchorPoint? WithUsedUIViewanimation, can I use easing settings?UIViewAnimationCurveEaseOutin options.- Can I use gravity settings?
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transform需要具有m34元素集，如 此处。anchorPoint移动视图图层，您需要更改视图的原始位置。transformneeds to have them34element set, as described here.anchorPointmoving your view’s layer, you need to change the view’s original position.UIViewAnimationOptionBeginFromCurrentState | UIViewAnimationOptionCurveEaseInOut | UIViewAnimationOptionAllowUserInteraction.