我在弹出窗口中嵌入了一个 UIViewController。这个控制器有两个子视图，一个 UINavigationBar 和一个 UITableView。我尝试实现新的搜索 API（因为 SearchDisplayControlled 在 iOS8 中已被弃用）。
当我点击搜索栏（显示两个范围）时，一切正常，导航栏仍然可见。但是当我开始在搜索栏中输入时，导航栏消失了，取而代之的是一个空白区域。我尝试添加self.searchController.hidesNavigationBarDuringPresentation = NO;该updateSearchResultsForSearchController:方法，但没有得到任何结果。（注意控制器viewDidLoad defines self.definesPresentationContext = YES;）
有什么想法可以随时显示导航吗？
I was seeing the same effect - in my case setting the property in viewDidLoad in my view controller made the navigation bar stick around:
- (void)viewDidLoad {
...
self.definesPresentationContext = YES;
...
}
When I'd previously set the same property from a class that was managing the search (initialized after -viewDidLoad had already been called on the VC), I saw the same behaviour of a blank nav bar that you describe.
这对我有用
self.navigationController.navigationBar.translucent = true;