动画：如何使用图层为视图设置动画？ [英] animation: how to animate a view using layer?

问题描述

显示我想要实现的目标的图像

我想动态地将视图从一个位置移动到一个新位置。如果更新视图的图层位置，我认为视图会动态地移动到新位置，我猜这是隐式动画，但是没有动画，为什么？

I want to move a view animately from a position to a new postion. If update the layer position of a view, I think the view will animately move to the new position, which is implicit animation I guess, but there's no animation, why?

- (IBAction)startAnimation:(id)sender {
    CGPoint position = self.imageView.layer.position;
    position.y += 90;
    self.imageView.layer.position = position;
}

推荐答案

隐式动画仅在独立的情况下发生层，而不是层备份视图。您将需要显式设置该位置的动画。您可以通过为该位置创建一个CABasicAnimation并将其添加到图层中来执行此操作，也可以使用UIView动画为视图的center属性设置动画。

Implicit animations only happen for standalone layer, not layers backing up views. You will need to explicitly animate the position. You can either do it by creating a CABasicAnimation for the position and add it to the layer or use UIView animations to animate the center property of the view.

CABasicAnimation *move = [CABasicAnimation animationWithKeyPath:@"position"];
move.toValue = [NSValue valueWithCGPoint:newPoint];
move.duration = 0.3;
[self.imageView.layer addAnimation:move forKey:@"myMoveAnimation"];

使用UIView动画

Using UIView animations

[UIView animateWithDuration:0.3 animations:^{
    self.imageView.center = newCenter;
}];

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