CAAnimationGroup(组合动画)创建

// 创建组动画对象
    CAAnimationGroup *group = [CAAnimationGroup animation];
    
    // 创建基本动画
    // 平移
    CABasicAnimation *anim1 = [CABasicAnimation animation];
    anim1.keyPath = @"transform.translation.y";
    anim1.toValue = @(400);
    
    // 缩放
    CABasicAnimation *anim2 = [CABasicAnimation animation];
    anim2.keyPath = @"transform.scale";
    anim2.toValue = @(0);
    
    // 旋转
    CABasicAnimation *anim3 = [CABasicAnimation animation];
    anim3.keyPath = @"transform.rotation";
    anim3.toValue = @(M_PI_4);
    
    // 设置动画数组
    group.animations = @[anim1,anim2,anim3];
    
    // 设置动画执行时间
    group.duration = 2.0f;
    
    group.removedOnCompletion = NO;
    group.fillMode = kCAFillModeForwards;
    
    // 将动画添加到图片上面
    [self.iconView.layer addAnimation:group forKey:nil];