Question

我正在尝试模拟iTunes iPad应用中看到的翻转动画。在主要精选页面上，如果您点击新版本列表中的一张小海报，它将翻开以显示该电影的所有详细信息。

点击海报时我会这样做：

//...create newView

[self.view addSubview:poster]; //because the poster was previously in a scrollview

[UIView transitionWithView:self.view duration:3
                   options:UIViewAnimationOptionTransitionFlipFromLeft animations:^{
                       [poster removeFromSuperview];
                       [self.view addSubview:newView];
                   }
                completion:NULL];

但是......整个视图翻转，而不仅仅是海报。即使我指定了FlipFromLeft，它也会垂直翻转而不是水平翻转。我做错了什么？

编辑：似乎你必须使用某种容器视图来执行此操作。所以我做了一个，将海报添加到其中，然后创建了一个虚拟的UIView用于测试：

CGPoint newPoint = [self.view convertPoint:CGPointMake(poster.frame.origin.x, poster.frame.origin.y) fromView:[poster superview]];
poster.frame = CGRectMake(0, 0, poster.frame.size.width, poster.frame.size.height);

UIView *containerView = [[UIView alloc] initWithFrame:CGRectMake(newPoint.x, newPoint.y, poster.frame.size.width, poster.frame.size.height)];
[self.view addSubview:containerView];
[containerView addSubview:poster];


UIView *testView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, containerView.frame.size.width, containerView.frame.size.height)];
testView.backgroundColor = [UIColor redColor];

[UIView transitionWithView:containerView duration:3
                   options:UIViewAnimationOptionTransitionFlipFromLeft animations:^{
                       [poster removeFromSuperview];
                       [containerView addSubview:testView];
                   }
                completion:NULL];

现在，红色UIView出现在海报的位置，但根本没有翻转动画。为什么不呢？

Answer 1

您告诉视图要转换为 self.view ，因此难怪为什么整个视图都是动画效果。尝试使用海报视图告诉过渡到动画。

[UIView transitionWithView:poster.view duration:3
                   options:UIViewAnimationOptionTransitionFlipFromLeft animations:^{
                       [poster removeFromSuperview];
                       [self.view addSubview:newView];
                   }
                completion:NULL];

Answer 2

我用两个UIImageView（名为：fromImageView和toImageView）创建了一个UIViewController（名为：transitionView）。我在viewDidLoad中将transitionView添加到了我的viewController，并将alpha设置为0。我用两个UIView创建了一个图像：

- (UIImage *) imageFromView: (UIView *) view {
    CGFloat alpha = [view alpha];
    [view setAlpha: 1.0];
    CGSize pageSize = view.frame.size;
    UIGraphicsBeginImageContext(pageSize);

    CGContextRef resizedContext = UIGraphicsGetCurrentContext();
    [view.layer renderInContext: resizedContext];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();
    [view setAlpha: alpha];
    return image;
}

这是我的翻译代码，大小调整：

- (void) flipFromView: (UIView *) fromView toView: (UIView *) toView {
    // Warning: positions is wrong when your image (or view) is in UIScrollView...
    CGRect frame = CGRectMake(-8.0, 30.0, 336.0, 380.0); // resizing the fromView if the image is small...
    CGFloat interval = 1.0;

    [[transitionView view] setAlpha: 1.0]; //

    UIImage *fromViewImage = [self imageFromView: fromView];
    UIImageView *fromImageView = [transitionView fromImageView];
    [fromImageView setImage: fromViewImage];
    [fromImageView setFrame: [fromView frame]];


    UIImage *toViewImage = [self imageFromView: toView];
    UIImageView *toImageView = [transitionView toImageView];
    [toImageView setImage: toViewImage];
    [toImageView setFrame: frame];

    [fromView setHidden: YES]; // hide original while animating

    toImageView.layer.transform = CATransform3DMakeRotation(M_PI_2, 0.0, 1.0, 0.0);

    [UIView animateWithDuration: interval
                          delay: 0.0
                        options: UIViewAnimationOptionCurveEaseIn
                     animations: ^{
                         [fromImageView setFrame: frame];
                         fromImageView.layer.transform = CATransform3DMakeRotation(M_PI_2, 0.0, 1.0, 0.0);
                     } completion: ^(BOOL finished) {

                     }
     ];

    [UIView animateWithDuration: interval
                          delay: interval // wait to previous animation ending
                        options: UIViewAnimationOptionCurveEaseOut
                     animations: ^{
                         toImageView.layer.transform = CATransform3DMakeRotation(M_PI_2,  0.0, 0.0, 0.0);
                         toImageView.frame = [toView frame];
                     } completion: ^(BOOL finished) {
                         [toView setAlpha: 1.0];
                         [fromView setHidden: NO];
                     }
     ];
}

抱歉我的英语不好，我不会说英语！

iOS - 翻转动画，从小到大

2 个答案: