iOS 小动画

　　一。图片旋转

　　CABasicAnimation* rotationAnimation;

rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];

rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * 2.0 ];

rotationAnimation.duration = 1;

rotationAnimation.cumulative = YES;

rotationAnimation.repeatCount = 0;

[customView.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];