CAKeyframeAnimation *animation = [CAKeyframeAnimation animation];
    animation.keyPath = @"position.x";
    animation.values = @[ @0, @10, @-10, @10, @-10, @10, @0 ];
    animation.keyTimes = @[ @0, @(1 / 6.0), @(2 / 6.0), @(3 / 6.0), @(4 / 6.0), @(5 / 6.0), @1 ];
    animation.duration = 0.4;

    animation.additive = YES;

    [_buttonTest.layer addAnimation:animation forKey:@"shake"];