动画 (不停旋转 | 由内向外扩大缩小 透明度渐变)

1. 360度不停旋转 (进入后台再回到界面动画继续)

   // 要操作的图片

   UIImageView *imageV = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"图片名"]];

   [myView addSubview:imageV];

    // 绕Z轴360度旋转

    CABasicAnimation* rotationAnimation;

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

    rotationAnimation.toValue = [NSNumbernumberWithFloat: M_PI * 2.0 ];

    // 动画时长

    rotationAnimation.duration =10;

    // 进入后台在进入界面动画不消失

    rotationAnimation.removedOnCompletion =NO;

    rotationAnimation.cumulative =YES;

    // 持续次数 (NSIntegerMax:无限大)

    rotationAnimation.repeatCount =NSIntegerMax;

    [imageV.layeraddAnimation:rotationAnimationforKey:@"rotationAnimation"];

2. 缩放并改变透明度

   // 要操作的图片

   UIImageView *scaleV = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"图片名"]];

   [myView addSubview:scaleV];

    // 缩放

    CABasicAnimation *opacityAnimation = [CABasicAnimationanimationWithKeyPath:@"opacity"];

    opacityAnimation.fromValue = [NSNumbernumberWithFloat:5.0];

    opacityAnimation.toValue = [NSNumbernumberWithFloat:0];

    opacityAnimation.removedOnCompletion =NO;

    CABasicAnimation *basicA = [CABasicAnimationanimationWithKeyPath:@"transform.scale"];

    basicA.fromValue =@(0);

    basicA.toValue =@(1.1);

    // 持续时间

    basicA.duration =5;

     // 重复次数

    basicA.repeatCount =NSIntegerMax;

    

    CAAnimationGroup *group = [CAAnimationGroupanimation];

    group.animations =@[basicA, opacityAnimation];

    group.duration =5;

    group.removedOnCompletion =NO;

    group.repeatCount =NSIntegerMax;

    

    [scaleV.layeraddAnimation:group forKey:nil];