我正试图围绕AutoLayout工作,我认为除了UIScrollViews我理解其中的大部分内容.当我将这些视图添加到项目时,他们拒绝扩展屏幕的尺寸.它们在iPhone垂直视图中显得很好,但在旋转时,它们不会扩展.此外,当您在iPad模拟器中启动项目时,UIScrollView屏幕将不会扩展到iPad的尺寸.实际的UIScrollView扩展但它的内容不会扩展.
我按照Apple的说明(https://developer.apple.com/library/ios/technotes/tn2154/_index.html)修复了我的动态内容高度问题,但它还没有解决UIScrollView的问题内容不会扩展以匹配屏幕的宽度.我已经读过,我需要将scrollview的内部子项固定到UIView的右边缘,但这看起来有点像黑客,这似乎与上面的Apple文档相矛盾.
这就是我所拥有的:
UI因此主视图是在笔尖中创建的.
视图是常规的UIView.不是UIScrollView
在viewDidLoad中创建并添加UIScrollView
所有动态内容都在nib中绘制,并存储在单独的UIView名称contentView中
contentView被添加到viewDidLoad中的scrollView
在viewDidLoad中添加了约束,将scrollView和contentView固定到superViews的边缘.
来自viewDidLoad的代码:
- (void)viewDidLoad { [super viewDidLoad]; UIView* contentView = self.contentView; UIScrollView * scrollView = [[UIScrollView alloc] init]; [self.view addSubview:scrollView]; [scrollView addSubview:contentView]; //remove auto contraints [scrollView setTranslatesAutoresizingMaskIntoConstraints:NO]; [contentView setTranslatesAutoresizingMaskIntoConstraints:NO]; // Set the constraints for the scroll view and the image view. NSDictionary* viewsDictionary = NSDictionaryOfVariableBindings(scrollView, contentView); [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[scrollView]|" options:0 metrics: nil views:@{@"scrollView":scrollView}]]; [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[scrollView]|" options:0 metrics: nil views:@{@"scrollView":scrollView}]]; [scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[contentView]|" options:0 metrics: nil views:viewsDictionary]]; [scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[contentView]|" options:0 metrics: nil views:viewsDictionary]]; }
您可以从此处下载示例项目:TestAutoLayout.zip
有没有人知道为什么scrollView内容不会扩展到self.view的宽度,尽管添加了约束?
正如在这个答案中所解释的:https://stackoverflow.com/a/16843937/950953,将contentView链接到主视图的宽度似乎是唯一可行的.
我用这段代码修改了上面的约束代码,现在屏幕正确显示.
UIView *mainView = self.view; // Set the constraints for the scroll view and the image view. NSDictionary* viewsDictionary = NSDictionaryOfVariableBindings(scrollView, contentView, mainView); [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[scrollView]|" options:0 metrics: 0 views:viewsDictionary]]; [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[scrollView]|" options:0 metrics: 0 views:viewsDictionary]]; [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[contentView]|" options:0 metrics: 0 views:viewsDictionary]]; [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[contentView]|" options:0 metrics: 0 views:viewsDictionary]]; //hack to tie contentView width to the width of the screen [mainView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:[contentView(==mainView)]" options:0 metrics:0 views:viewsDictionary]];
如果有人能找到合适的解决方案,请发布.