Cocoa touch 如何使用CABasicAnimation更改Frame.size

您好，我已使用以下代码中使用的CABasicAnimation更改了帧大小

CABasicAnimation *newanim; 
newanim = [CABasicAnimation animationWithKeyPath:@"bounds.size"];

newanim.duration=3.0;
newanim.fromValue=[NSValue valueWithCGSize:CGSizeMake(0,0)];
newanim.toValue=[NSValue valueWithCGSize:CGSizeMake(self.backgroundImageView.bounds.size.width, self.foregroundImageView.bounds.size.height)];

newanim.fillMode=kCAFillModeForwards;
newanim.autoreverses = YES;
newanim.repeatCount = 1;
newanim.timingFunction = [CAMediaTimingFunction functionWithName: kCAMediaTimingFunctionEaseInEaseOut];
[self.view.layer addAnimation:newanim forKey:@"changeSize"]; 

但动画从原点开始并向两侧移动（就像动画从中心开始一样）

我试着换衣服 newanim=[CABasicAnimation animationWithKeyPath:@“frame.size”]

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它根本不起作用。

苹果对此有一个答案：

但就个人而言，我不认为这是最好的方式，CATTransformM3dMakeScale似乎更好：

CABasicAnimation *transformAnimation = [CABasicAnimation animationWithKeyPath:@"transform"];
transformAnimation.duration=3.0;
transformAnimation.toValue=[NSValue valueWithCATransform3D:CATransform3DMakeScale(scaleFactorX, scaleFactorY, scaleFactorZ)];
transformAnimation.removedOnCompletion = FALSE;

[layer addAnimation:transformAnimation forKey:@"transform"];

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要在Swift 5中缩放层的框架，可以使用：

let animation = CABasicAnimation(keyPath: "transform.scale.y")
animation.toValue = 0.1
animation.duration = 1.5
animation.timingFunction = CAMediaTimingFunction.init(name: .easeInEaseOut)
layer.add(animation, forKey: "animation_scale_y")

transfrom.scale.y

缩放高度，

transfrom.scale.x

缩放宽度，

transfrom.scale.z

缩放深度

要在一个动画中变换所有缩放参数，可以使用

let animation = CABasicAnimation(keyPath: "transform.scale")
animation.toValue = CATransform3DMakeScale(0.1, 0.1, 1)
animation.duration = 1.5
animation.timingFunction = CAMediaTimingFunction.init(name: .easeInEaseOut)
layer.add(animation, forKey: "animation_scale")