xcode 移动一个 CALayer（添加动画）
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时间：2020-09-14 22:36:13 来源:igfitidea点击:
move a CALayer (add animation)
提问by jean bernard
well I have a CALayer layerand I would like to move it, with a CADisplaylink. Like :
好吧，我有一个 CALayer layer，我想用 CADisplaylink 移动它。喜欢 ：
layer.center=CGPointMake(layer.center.x + 10, layer.center.y + 10);
but I can't use centeror positionfor the layer.Here is my problem, I want to make it move like it was a uiimageview.
但我不能使用center或position用于图层。这是我的问题，我想让它像 uiimageview 一样移动。
回答by beryllium
To move layer try to use this method
要移动图层尝试使用此方法
-(void)moveLayer:(CALayer*)layer to:(CGPoint)point{
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"position"];
animation.fromValue = [layer valueForKey:@"position"];
animation.toValue = [NSValue valueWithCGPoint:point];
layer.position = point;
[layer addAnimation:animation forKey:@"position"];
}
