摇动视图

Objective-C

CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"position.x"];
animation.values = @[ @0, @10, @-10, @10, @0 ];
animation.keyTimes = @[ @0, @(1 / 6.0), @(3 / 6.0), @(5 / 6.0), @1 ];
animation.duration = 0.4;
animation.additive = YES;
[_label.layer addAnimation:animation forKey:@"shake"];

Swift 3

let animation = CAKeyframeAnimation(keyPath: "position.x")
animation.values = [ 0, 10, -10, 10, 0 ]
animation.keyTimes = [ 0, NSNumber(value: (1 / 6.0)), NSNumber(value: (3 / 6.0)), NSNumber(value: (5 / 6.0)), 1 ]
animation.duration = 0.4
animation.isAdditive = true
label.layer.add(animation, forKey: "shake")