在第二个 VC 的应用程序中,我有UICollectionViewCell
几个图像缩影,点击后,您使用单元格内的所有图像切换到全屏(例如,如果单元格中有 3 个图像(滚动视图在里面),您将这三个图像切换到全屏演示) . 为了显示几张图片,我在另一个里面使用了一个滚动视图(在 StackOverflow 上的某个地方找到了解决方案)。
在情节提要上,我只有主 UIView。我在代码中设置的所有其他内容。我知道,在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。这个解决方案我只在fullScreenVC
.
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 willRotateTo 中的旋转...我正在删除旧的子视图并添加新的带有框架的肖像。
-(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,在旋转滚动视图滚动到第一个元素之后,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,但之后滚动视图的行为很奇怪。
使用两个滚动视图(一个在另一个内部)并正确显示图像时如何正确处理旋转?