UIScrollView 和 UINavigationController 交互
我刚刚注意到，如果我将 UIScrollView 作为 UIViewController 的根视图：
- (void)loadView
{
self.view = [[UIScrollView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
}
我会免费获得很多行为：如果状态栏、导航栏或工具栏存在且半透明，并且如果任何导航布局发生更改，则会更新属性：
[self.navigationController setNavigationBarHidden:YES animated:YES];
不幸的是，当更改滚动视图时，滚动视图也会自动更改其 contentOffset contentsInset，因此当导航栏消失时内容向上，当导航栏出现时内容向下。
我很喜欢这种自由行为，但我希望我的内容在导航栏来来去去时保持静止，并且我找不到在哪里可以避免 contentOffset 的更改。
编辑：
经过一些堆栈跟踪，我发现每次自动调整偏移量时都会调用一个方法：[UIScrollView(Static) _adjustContentOffsetIfNecessary];但由于我找不到有关此方法的任何文档，所以我不知所措。
I just noted that if I put a UIScrollView as the root view of a UIViewController:
- (void)loadView
{
self.view = [[UIScrollView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
}
I get a lot of behavior for free: The scrollView sets it's contentInset and scrollIndicatorInsets automatically if the status bar, navigation bar, or toolbar are present and translucent, and updates the properties if any navigation layouts change:
[self.navigationController setNavigationBarHidden:YES animated:YES];
Unfortunately the scroll view also changes it's contentOffset automatically when changing the contentsInset, so the content goes up when the navigation bar disappears and down when the navigation bar appears.
I like a lot of this free behavior, but I would like for my content to stay still when the navigation bar comes and goes, and I can't find where to avoid the change in contentOffset.
Edit:
After some stack traces, I discovered a method that is being called every time the offset is automatically adjusted: [UIScrollView(Static) _adjustContentOffsetIfNecessary]; but since I can't find any documentation on this method, I'm at a loss.
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好的，我已经找到了。 UIViewController 有一个名为“automaticallyAdjustsScrollViewInsets”的属性，该属性在显示/隐藏导航栏时更改 contentOffset。将其设置为 no 以防止 UIScrollView 发生更改。
来源（和ios6解决方案）：https://stackoverflow.com/a/20325593/936957
Ok, I have found it. UIViewController has a property called 'automaticallyAdjustsScrollViewInsets', which changes the contentOffset when showing/hiding navigationBar. Set it to no to prevent changes on the UIScrollView.
Source (and ios6 solution): https://stackoverflow.com/a/20325593/936957
您是否尝试过在隐藏/显示导航栏时设置内容插入？
隐藏时像这样：
显示时这样：
AFAIK
contentInset不应由系统更改，它会更改应用程序的布局...Have you tried setting the content insets when you hide/show the navigation bar?
Like this when hiding:
and this when showing:
AFAIK
contentInsetshouldn't be changed by the system, it would change the layout of your app...我的解决方案是在
viewDidload中添加：。
我没有使用
[UINavigationController setNavigationBarHidden:animated:]，而是使用：隐藏导航栏并避免 contentOffset 更改。
并记住在
viewDidDisappear或某个适当的地方设置隐藏状态：My solution is add:
in
viewDidload.and instead of using
[UINavigationController setNavigationBarHidden:animated:], I use:to hide the navigationbar and avoid contentOffset change.
And remember to set the hidden state back in
viewDidDisappearor some place appropriate: