x軸縮放：
CABasicAnimation *theAnimation;
theAnimation=[CABasicAnimation animationWithKeyPath:@"transform.scale.x"];
theAnimation.duration=8;
theAnimation.removedOnCompletion = YES;
theAnimation.fromValue = [NSNumber numberWithFloat:1];
theAnimation.toValue = [NSNumber numberWithFloat:0.5];
?[yourView.layer addAnimation:theAnimation forKey:@"animateTransform"];

y軸縮放：
CABasicAnimation *theAnimation;
theAnimation=[CABasicAnimation animationWithKeyPath:@"transform.scale.y"];
theAnimation.duration=8;
theAnimation.removedOnCompletion = YES;
theAnimation.fromValue = [NSNumber numberWithFloat:1];
theAnimation.toValue = [NSNumber numberWithFloat:0.5];
?[yourView.layer addAnimation:theAnimation forKey:@"animateTransform"];

x軸，y軸同時按比例縮放：
CABasicAnimation *theAnimation;
theAnimation=[CABasicAnimation animationWithKeyPath:@"transform.scale"];
theAnimation.duration=8;
theAnimation.removedOnCompletion = YES;
theAnimation.fromValue = [NSNumber numberWithFloat:1];
theAnimation.toValue = [NSNumber numberWithFloat:0.5];
?[yourView.layer addAnimation:theAnimation forKey:@"animateTransform"];

以上縮放是以view的中心點為中心縮放的，如果需要自定義縮放點，可以設置卯點：
//中心點
[yourView.layer setAnchorPoint:CGPointMake(0.5, 0.5)];

//左上角
[yourView.layer setAnchorPoint:CGPointMake(0, 0)];

//右下角
[yourView.layer setAnchorPoint:CGPointMake(1, 1)];

轉載于:https://www.cnblogs.com/XXxiaotaiyang/p/5043327.html

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