ios - CGAffineTransformTranslate 正在旋转

Question

我有一个 View Controller ，在加载时应该在 View 中的特定点放大(然后以动画方式缩小)。当它被 segue 推到导航堆栈的顶部时，它可以很好地显示放大的区域。

但是，如果我转到 StoryBoard 并将该 View Controller 设置为初始 View Controller ，加载后 View 会放大但旋转 90 度。不知道为什么。这是代码:

-(void)viewDidAppear:(BOOL)animated
{        
    //INITIAL TRANSFORM
    CGAffineTransform t1 = CGAffineTransformMakeTranslation(-50, 0); 
    CGAffineTransform t2 = CGAffineTransformTranslate(t1, 0, 250);
    CGAffineTransform t3 = CGAffineTransformScale(t2, 1.7, 1.7);
    self.view.transform = t3;

    //ZOOM OUT
    [UIView animateWithDuration:8
                          delay:1.5
                        options:UIViewAnimationCurveEaseOut animations:^{
                           // self.view.transform = CGAffineTransformIdentity;
                        }completion:nil
    ];
}

有什么想法吗？

Answer 1

也许您应该使用 View 中的初始转换:

   -(void)viewDidAppear:(BOOL)animated
    {        
        //INITIAL TRANSFORM
        CGAffineTransform t0 = self.view.transform;
        CGAffineTransform t1 = CGAffineTransformTranslate(t0, -50, 0); 
        CGAffineTransform t2 = CGAffineTransformTranslate(t1, 0, 250);
        CGAffineTransform t3 = CGAffineTransformScale(t2, 1.7, 1.7);
        self.view.transform = t3;

        //ZOOM OUT
        [UIView animateWithDuration:8
                              delay:1.5
                            options:UIViewAnimationCurveEaseOut animations:^{
                               // self.view.transform = CGAffineTransformIdentity;
                            }completion:nil
        ];
    }