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這是我的第一篇文章Stack Overflow，我是一個iOS初學者，請耐心等待！UIScrollView旋轉後只顯示UIView的一部分
我有一個示例應用程序，我在父UIView（topView）中有三個UIViews（headerView，scrollViewContainer和bodyView），並且所有這些視圖都是在代碼中創建的。 topView被添加到在故事板中創建的UIScrollView（pageScrollView）。
pageScrollView正在填充iPhone的全屏幕，我使用Autolayout。該應用程序只包含下面看到的ViewController.h和companioning .m文件，以及Appdelegate.x。我想我使用單視圖應用程序模板開始。我使用的是iOS 6和Xcode 4.6，但我也嘗試過4.5。
我試圖儘可能刪除與此問題無關的其他代碼。
問題： 當應用程序啓動時，它會正確顯示其所有視圖，並且scrollView允許按預期查看所有三個視圖。但是在旋轉到風景之後，scrollView以某種方式抵消了內容。例如：停留在頂部並旋轉=內容看起來不錯，但向下滾動一下並旋轉會使內容的頂部不顯示。
我試過的東西：我搜索了網絡尋求幫助，但我還沒有找到任何似乎對我有幫助的東西。我添加了諸如origin和contentSize之類的各種數據的日誌記錄，並試圖設置其中的一些但沒有取得任何成功。我還使用'po [[UIWindow keyWindow] _autolayoutTrace]'來確保約束條件正確。
我看不到我做錯了什麼。我的代碼中是否有任何明顯的缺失？
在此先感謝！
這裏的ViewController.m：
#import "ViewController.h"
@interface ViewController()
{
UIView *topView;
UIView *headerView;
UIView *bodyView;
UIView *scrollViewContainer;
UIInterfaceOrientation newOrientation;
CGFloat bodyViewHeight;
CGSize newBounds;
float pictureScrollHeight;
}
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
newBounds = [self sizeInOrientation:[UIApplication sharedApplication].statusBarOrientation];
newOrientation = [UIApplication sharedApplication].statusBarOrientation;
bodyViewHeight = 1200; // The height of the body view varies in size depending on orientation
self.pageScrollView.translatesAutoresizingMaskIntoConstraints = NO;
topView = [[UIView alloc] init];
[topView setBackgroundColor:[UIColor clearColor]];
topView.translatesAutoresizingMaskIntoConstraints = NO;
[self.pageScrollView addSubview:topView];
headerView = [[UIView alloc] init];
[headerView setBackgroundColor:[UIColor redColor]];
headerView.translatesAutoresizingMaskIntoConstraints = NO;
[topView addSubview:headerView];
scrollViewContainer = [[UIView alloc] init];
[scrollViewContainer setBackgroundColor:[UIColor blueColor]];
scrollViewContainer.translatesAutoresizingMaskIntoConstraints = NO;
[topView addSubview:scrollViewContainer];
bodyView = [[UIView alloc] init];
[bodyView setBackgroundColor:[UIColor greenColor]];
bodyView.translatesAutoresizingMaskIntoConstraints = NO;
[topView addSubview:bodyView];
[self updateViewConstraints];
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
}
- (void)updateViewConstraints
{
[super updateViewConstraints];
// Remove old constraints
[self.view removeConstraints:self.view.constraints];
[self.pageScrollView removeConstraints:self.pageScrollView.constraints];
[topView removeConstraints:topView.constraints];
[scrollViewContainer removeConstraints:scrollViewContainer.constraints];
if ((newOrientation == UIDeviceOrientationLandscapeLeft) || (newOrientation == UIDeviceOrientationLandscapeRight)) {
pictureScrollHeight = 300;
} else {
pictureScrollHeight = 203;
}
[headerView setNeedsDisplay];
[bodyView setNeedsDisplay];
CGFloat topViewHeight = bodyViewHeight + 55 + pictureScrollHeight;
//self.pageScrollView = _pageScrollView
NSDictionary *viewsDict = NSDictionaryOfVariableBindings(_pageScrollView, topView, headerView, bodyView, scrollViewContainer);
NSDictionary *metricsDict = @{@"topViewHeight": [NSNumber numberWithFloat:topViewHeight],
@"newBoundsWidth": [NSNumber numberWithFloat:newBounds.width],
@"pictureScrollHeight": [NSNumber numberWithFloat:pictureScrollHeight],
@"bodyViewHeight": [NSNumber numberWithFloat:bodyViewHeight]};
// pageScrollView - child to self.view
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[_pageScrollView]-0-|" options:0 metrics:nil views:viewsDict]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[_pageScrollView]-0-|" options:0 metrics:nil views:viewsDict]];
// topView - child to pageScrollView
[self.pageScrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[topView(newBoundsWidth)]-0-|" options:0 metrics:metricsDict views:viewsDict]];
[self.pageScrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[topView(topViewHeight)]-0-|" options:0 metrics:metricsDict views:viewsDict]];
// headerView - child to topView
[topView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[headerView]-0-|" options:0 metrics:nil views:viewsDict]];
[topView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[headerView(55.0)]" options:0 metrics:nil views:viewsDict]];
// scrollViewContainer - child to topView
[topView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[scrollViewContainer]-0-|" options:0 metrics:nil views:viewsDict]];
[topView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[headerView]-0-[scrollViewContainer(pictureScrollHeight)]" options:0 metrics:metricsDict views:viewsDict]];
// bodyView - child to topView
[topView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[bodyView]-0-|" options:0 metrics:nil views:viewsDict]];
[topView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[scrollViewContainer]-0-[bodyView(bodyViewHeight)]-0-|" options:0 metrics:metricsDict views:viewsDict]];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
newOrientation = toInterfaceOrientation;
newBounds = [self sizeInOrientation:toInterfaceOrientation];
}
-(CGSize) sizeInOrientation:(UIInterfaceOrientation)orientation
{
CGSize size = [UIScreen mainScreen].bounds.size;
UIApplication *application = [UIApplication sharedApplication];
if (UIInterfaceOrientationIsLandscape(orientation))
{
size = CGSizeMake(size.height, size.width);
}
if (application.statusBarHidden == NO)
{
size.height -= MIN(application.statusBarFrame.size.width, application.statusBarFrame.size.height);
}
return size;
}
@end
Mark，感謝您花時間幫助我 - 您的示例完美無缺！沒有檢查你的代碼，只是依靠你的帖子在這裏，你的意思是說問題是我每次都重新創建約束？非常感謝！ – mberg 2013-02-12 15:05:32
可能是的。滾動視圖有點棘手。我沒有確切的答案。我剛剛刪除了不必要的東西。 – 2013-02-12 16:59:03