从详细信息视图返回后，UISearchBar文本字段无法编辑

Question

UISearchBar文本字段在从详细信息视图返回后无法编辑，但是选项选项也可以在交叉按钮工作时可见。

使用以下代码

@property (weak, nonatomic) IBOutlet UISearchBar *searchBar;

- (void) viewWillAppear:(BOOL)animated {
    [super viewWillAppear:YES];
    [self performSelector:@selector(showKeyboard) withObject:nil afterDelay:0.1];
}
- (void)showKeyboard {
    [self.searchBar becomeFirstResponder];
}

哪个是第一次工作但回来时却无法正常工作。但showKeyboard方法的断点正在运行。

此搜索用于两个不同的部分，代码就是这样 -

UINavigationController *navController =self.navigationController;
    TPTabBarController *tabbar = nil;

    if([navController.presentingViewController isKindOfClass:[TPTabBarController class]]){
        tabbar = (TPTabBarController *)navController.presentingViewController;
    }else{
        NSLog(@"Failed to get tabbar in TPBookViewController. It is nil.");
    }

    if(tabbar != nil && tabbar.searchNavigationController != nil){
        if(tabbar.searchNavigationController.viewControllers.count == 2){
            //current view is SearchResultViewController
            SearchResultViewController *searchResultViewController = (SearchResultViewController*)tabbar.searchNavigationController.viewControllers[1];
            [searchResultViewController reloadDataAndLocateToPage:self.currentPage manual:_currentManual];
        }
        [self presentViewController:tabbar.searchNavigationController animated:YES completion:nil];
    }

在一个部分正在工作，但在另一个视图控制器中它无法正常工作