UIScrollViews帧后旋转

Question

在第二个VC的应用程序中，我UICollectionViewCell了很少的图像缩影，点击后，您可以进入全屏，其中包含单元格内的所有图像（例如，如果单元格中有3张图像（滚动视图在里面），您将这三张图像设置为全屏演示）。为了显示一些图像，我在另一个滚动视图中使用一个滚动视图（解决方案位于StackOverflow上的某处）。

在故事板上，我只有主 UIView。我在代码中设置的所有其他内容。我知道，使用自动布局时我不应该在代码中使用框架，但是在使用带有旋转缩放的滚动视图时，我几乎不可能设置适当的约束。而这个解决方案我只在fullScreenVC中使用.

所以，在viewDidLoad

self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)]; 
self.outerScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];
self.outerScrollView.showsHorizontalScrollIndicator = NO;
self.outerScrollView.showsVerticalScrollIndicator = YES;
self.outerScrollView.delegate = self;
self.outerScrollView.pagingEnabled = YES;
[self scrollViewDataForPortrait:NO];
[self.view insertSubview:self.outerScrollView belowSubview:self.blackInfoBox];
[self scrollToCurrentElement:[self.currentPictureToDisplay integerValue]];

scrollViewDataForPortatit：（BOOL）是用图片填充内部滚动视图和设置框架的方法，框架取决于方向

- (void)scrollViewDataForPortrait:(BOOL)isPortrait
{
    for (int gadabout = 0; gadabout < [self.imagesToDisplay count]; gadabout++)
    {
        CGRect frame;
        frame.origin.x = self.imageView.frame.size.width * gadabout;
        frame.origin.y = 0;
        frame.size = self.imageView.frame.size;
        UIScrollView *innerScrollView = [[UIScrollView alloc] initWithFrame:frame];
        UIImageView *newView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];
        if (isPortrait)
        {
            [newView setFrame:CGRectMake(0, 0, 768, 1024)];
        }
        newView.contentMode = UIViewContentModeScaleAspectFit;
        newView.userInteractionEnabled = YES;
        UIImage *painting = [self.imagesToDisplay objectAtIndex:gadabout];
        if (painting)
        {
            [newView setImage:painting];
        }
        innerScrollView.minimumZoomScale = 1.0f;
        innerScrollView.maximumZoomScale = 4.0f;
        innerScrollView.delegate = self;
        innerScrollView.tag = gadabout;
        [self.arrayForUIImageViewsForZooming addObject:newView];
        [innerScrollView addSubview:newView];
        [innerScrollView setBackgroundColor:[UIColor blackColor]];
        [innerScrollView setContentSize:CGSizeMake(1024, 768)];
        if (isPortrait)
        {
            [innerScrollView setContentSize:CGSizeMake(768, 1024)];
        }
        [self.outerScrollView addSubview:innerScrollView];
    }
    self.outerScrollView.contentSize = CGSizeMake(self.outerScrollView.frame.size.width * self.imagesToDisplay.count, self.outerScrollView.frame.size.height);
}

要处理将旋转到...我正在删除旧的子视图并添加新的肖像框架。

-(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
    self.outerScrollView.zoomScale = 1.0;
    if(UIInterfaceOrientationIsLandscape(toInterfaceOrientation))
    {
        [UIView animateWithDuration:0.3f animations:^{
            [self.outerScrollView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
            [self.imageView setFrame:CGRectMake(0, 0, 1024, 768)];
            [self.outerScrollView setFrame:CGRectMake(0, 0, 1024, 768)];
            [self.arrayForUIImageViewsForZooming removeAllObjects];
            [self scrollViewDataForPortrait:NO];
        } completion:^(BOOL finished) {
            [UIView animateWithDuration:0.5f animations:^{
                [self scrollToCurrentElement:[self.currentPictureToDisplay integerValue]];
            } completion:nil];
        }];
    }
    else
    {
        [UIView animateWithDuration:0.3f animations:^{
            [self.outerScrollView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
            [self.imageView setFrame:CGRectMake(0, 0, 768, 1024)];
            [self.outerScrollView setFrame:CGRectMake(0, 0, 768, 1024)];
            [self.arrayForUIImageViewsForZooming removeAllObjects];
            [self scrollViewDataForPortrait:YES];
        } completion:^(BOOL finished) {
            [UIView animateWithDuration:0.3f animations:^{
                [self scrollToCurrentElement:[self.currentPictureToDisplay integerValue]];
            } completion:nil];
        }];

不幸的是，这个解决方案的缺点是，旋转后滚动视图滚动到第一个元素，而我以编程方式滚动到滚动视图中的上一个（当前）位置。这种变化对于我不想要的用户来说是显而易见的。

我还尝试在willRotate中设置所有视图和子视图的框架，但之后滚动视图行为很奇怪。

使用两个滚动视图（一个在另一个内部）时如何正确处理旋转并正确显示图像？

Answer 1

"我还尝试在willRotate中设置所有视图和子视图的框架，但之后滚动视图的行为很奇怪。

因此，这是解决问题的正确解决方案。我用这段代码做了，例如，在旋转到横向之前为所有子视图设置适当的框架。

    int gadabout = 0;
    for (UIScrollView *innerScrollView in self.outerScrollView.subviews)
    {
        [innerScrollView setFrame:CGRectMake(1024 * gadabout, 0, 1024, 768)];    
        if ([innerScrollView isKindOfClass:[UIScrollView class]])
        {
            [innerScrollView setContentSize:CGSizeMake(1024, 768)];
        }    
        for (UIImageView *innerImageView in innerScrollView.subviews)
        {
            [innerImageView setFrame:CGRectMake(0, 0, 1024, 768)];
        }
        gadabout++;
    }