CAAnimationGroup动画的使用

// 使用示例
CABasicAnimation *rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
rotationAnimation.toValue = [NSNumber numberWithFloat:(2 * M_PI) * 2];
rotationAnimation.duration = 0.35f;
rotationAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];

CABasicAnimation *scaleAnimation = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
scaleAnimation.toValue = [NSNumber numberWithFloat:0.0];
scaleAnimation.duration = 0.35f;
scaleAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];

CAAnimationGroup *animationGroup = [CAAnimationGroup animation];
animationGroup.duration = 0.35f;
animationGroup.autoreverses = YES;
animationGroup.repeatCount = 1;
animationGroup.animations =[NSArray arrayWithObjects:rotationAnimation, scaleAnimation, nil];
[view.layer addAnimation:animationGroup forKey:@"animationGroup"];