導航欄消失

Question

我試圖找出爲什麼，當我開始在UISearchController.searchBar IT負載正確輸入了我的整個導航欄消失，並激活正確的，但我失去了活躍的NavBar當我開始打字。下面的代碼從viewDidLoad中加載searchController：

UITableViewController *searchResultsController = [[UITableViewController alloc] initWithStyle:UITableViewStylePlain]; 

    searchResultsController.tableView.dataSource = self; 
    searchResultsController.tableView.delegate = self; 
    searchResultsController.tableView.backgroundColor = [UIColor redColor];  

    self.searchController = [[UISearchController alloc] initWithSearchResultsController:searchResultsController]; 
    self.searchController.delegate = self; 
    self.searchController.searchResultsUpdater = self; 
    self.searchController.dimsBackgroundDuringPresentation = YES; 
    self.searchController.hidesNavigationBarDuringPresentation = NO; 

    [self.searchController.searchBar sizeToFit]; 

    self.tableView.tableHeaderView = self.searchController.searchBar; 
    self.definesPresentationContext = NO; 

而這裏的結果後，我開始打字：

通知表視圖如何是存在的，但它似乎佔據的空間的導航控制器，並向下延伸到第一部分標題。有任何想法嗎？

謝謝。

Answer 1

您需要definesPresentationContext設置爲YES。從蘋果例如：

// Search is now just presenting a view controller. As such, normal view controller 
// presentation semantics apply. Namely that presentation will walk up the view controller 
// hierarchy until it finds the root view controller or one that defines a presentation context. 

self.definesPresentationContext = YES 

Answer 2

這個工作對我來說

self.navigationController.navigationBar.translucent = true;

Answer 3

所以，我最終能與此以下的init程序來解決這個問題。但是，我不太確定我做了什麼來實現這一點。繁忙的種類，現在，所以我就複製粘貼此解決方案，將接受一個解決方案，如果有人可以找出。

- (void)loadSearchBar 
{ 

    NSLog(@"Loading SearchBar"); 

    UITableViewController *searchResultsController = [[UITableViewController alloc] initWithStyle:UITableViewStylePlain]; 
    UITableView *myTv = [[UITableView alloc] initWithFrame:[[UIScreen mainScreen] bounds] style:UITableViewStylePlain]; 
    searchResultsController.tableView = myTv; 
    searchResultsController.tableView.dataSource = self; 
    searchResultsController.tableView.delegate = self; 
    searchResultsController.tableView.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag; 
    searchResultsController.tableView.sectionIndexColor = [UIColor colorWithHexString:linkBlue]; 

    self.searchResultsController = searchResultsController; 

    self.searchController = [[UISearchController alloc] initWithSearchResultsController:searchResultsController]; 
    self.searchController.delegate = self; 
    self.searchController.searchResultsUpdater = self; 
    self.searchController.dimsBackgroundDuringPresentation = YES; 
    self.searchController.hidesNavigationBarDuringPresentation = NO; 
    self.searchController.searchBar.frame = CGRectMake(self.searchController.searchBar.frame.origin.x, self.searchController.searchBar.frame.origin.y, self.searchController.searchBar.frame.size.width, 44.0); 

    self.searchBar = self.searchController.searchBar; 
    self.searchBar.autocorrectionType = UITextAutocorrectionTypeNo; 
    self.searchBar.autocapitalizationType = UITextAutocapitalizationTypeNone; 
    self.searchBar.delegate = self; 
    self.searchBar.translucent = YES; 
    self.tableView.tableHeaderView.layer.zPosition++; 

    self.tableView.tableHeaderView = self.searchController.searchBar; 
    self.definesPresentationContext = YES; 

    //add color to search field 
    UIView *subviews = [self.searchBar.subviews lastObject]; 
    UITextField *textView = (id)[subviews.subviews objectAtIndex:1]; 

    textView.backgroundColor = [UIColor colorWithHexString:textFieldBlue]; 

}