Objective c UIScrollView仅显示旋转后UIView的一部分
这是我第一篇关于堆栈溢出的帖子,我是一个iOS初学者,所以请耐心听我说 我有一个示例应用程序,其中父UIView(topView)中有三个UIView(headerView、scrollViewContainer和bodyView),所有这些视图都是用代码创建的。topView将添加到在情节提要中创建的UIScrollView(页面滚动视图) pageScrollView占据了iPhone的全屏,我使用了Autolayout。该应用程序仅包含下面所示的ViewController.h和companing.m文件,以及Appdelegate.x。我想我首先使用了单视图应用程序模板。我使用的是iOS 6和Xcode 4.6,但我也尝试了4.5 我已经尝试删除尽可能多的与此问题无关的其他代码 问题是: 当应用程序启动时,它会正确显示所有视图,scrollView允许按预期查看所有三个视图。但在旋转到横向后,scrollView以某种方式抵消了内容。例如:停留在顶部并旋转=内容看起来正常,但向下滚动一点并旋转会使内容顶部不显示 我尝试过的:我搜索过网络寻求帮助,但我没有找到任何似乎对我有帮助的东西。我添加了各种数据的日志记录,如origin和contentSize,并尝试设置其中一些数据,但没有成功。我还使用了'po[[UIWindow keyWindow]\u autolayoutTrace]'来确保约束是正确的 我看不出我做错了什么。我的代码中是否缺少任何明显的东西 提前谢谢 这是ViewController.m:Objective c UIScrollView仅显示旋转后UIView的一部分,objective-c,ios6,autolayout,Objective C,Ios6,Autolayout,这是我第一篇关于堆栈溢出的帖子,我是一个iOS初学者,所以请耐心听我说 我有一个示例应用程序,其中父UIView(topView)中有三个UIView(headerView、scrollViewContainer和bodyView),所有这些视图都是用代码创建的。topView将添加到在情节提要中创建的UIScrollView(页面滚动视图) pageScrollView占据了iPhone的全屏,我使用了Autolayout。该应用程序仅包含下面所示的ViewController.h和compa
#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
检查自动调整大小的遮罩
[self.pageScrollView setAutoresizingMask:UIViewAutoresizingFlexibleHeight];
看起来你没有在willRotateToInterfaceOrientation中对新手做任何事情。在获得新边界后,不应该调用updateView方法。首先,不需要在-updateViewConstraints方法中重新创建所有约束。你只需要在这里更新它们。 要实现您的目标,请执行以下操作:
#import "ViewController.h"
@interface ViewController ()
@property (nonatomic, strong) IBOutlet UIScrollView* pageScrollView;
@property (nonatomic, strong) NSLayoutConstraint* pictureHeightConstraint;
@property (nonatomic, strong) NSLayoutConstraint* topViewWidthConstraint;
@property (nonatomic, strong) NSLayoutConstraint* topViewHeightConstraint;
@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 setupConstraints];
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
}
- (void)setupConstraints {
// 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);
// 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]-0-|" options:0 metrics:nil views:viewsDict]];
[self.pageScrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[topView]-0-|" options:0 metrics:nil views:viewsDict]];
NSLayoutConstraint* topViewWidthConstraint = [NSLayoutConstraint constraintWithItem:topView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:newBounds.width];
self.topViewWidthConstraint = topViewWidthConstraint;
[topView addConstraint:self.topViewWidthConstraint];
NSLayoutConstraint* topViewHeightConstraint = [NSLayoutConstraint constraintWithItem:topView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:topViewHeight];
self.topViewHeightConstraint = topViewHeightConstraint;
[topView addConstraint:self.topViewHeightConstraint];
// 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]" options:0 metrics:nil views:viewsDict]];
NSLayoutConstraint* pictureHeightConstraint = [NSLayoutConstraint constraintWithItem:scrollViewContainer attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:pictureScrollHeight];
self.pictureHeightConstraint = pictureHeightConstraint;
[scrollViewContainer addConstraint:self.pictureHeightConstraint];
// 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]-0-|" options:0 metrics:nil views:viewsDict]];
}
- (void)updateViewConstraints
{
[super updateViewConstraints];
if ((newOrientation == UIDeviceOrientationLandscapeLeft) || (newOrientation == UIDeviceOrientationLandscapeRight)) {
pictureScrollHeight = 300;
} else {
pictureScrollHeight = 203;
}
CGFloat topViewHeight = bodyViewHeight + 55 + pictureScrollHeight;
self.pictureHeightConstraint.constant = pictureScrollHeight;
self.topViewHeightConstraint.constant = topViewHeight;
self.topViewWidthConstraint.constant = newBounds.width;
[self.pageScrollView setNeedsUpdateConstraints];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
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
ScrollView根据添加到其中的子视图约束自动计算其内容大小。当然,它只在自动布局环境下工作。自动重新设置屏幕不是只针对非自动布局吗?无论如何,我在viewDidLoad中添加了它,但没有任何区别。在清理代码时,我不小心删除了'newOrientation=toInterfaceOrientation;'从willRotateTointerfaceOrientation,所以我更新了我的帖子以反映这一点。但是,代码仍然不起作用。马克,谢谢你花时间来帮助我-你的例子非常有效!没有检查你的代码,仅仅依靠你在这里的帖子,你的意思是问题在于我每次都重新创建了约束吗?非常感谢!可能是的。滚动视图有点棘手。我没有确切的答案。我刚搬走了不必要的东西。