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ios - 如何从 navigationItem 添加和删除 searchBar

问题描述

我在向 UINavigationBar 添加和删除 UISearchControllers searchBar 时遇到问题。

这是我正在做的事情：

将 searchBar 添加到视图

searchController = [[UISearchController alloc]initWithSearchResultsController:nil];

searchController.searchResultsUpdater = self;
searchController.searchBar.delegate = self;

searchController.dimsBackgroundDuringPresentation = NO;
searchController.hidesNavigationBarDuringPresentation = NO;
searchController.searchBar.searchBarStyle = UISearchBarStyleProminent;
searchController.searchBar.barTintColor = [UIColor blackColor];
searchController.searchBar.tintColor = [UIColor darkGrayColor];

[searchController.searchBar setFrame:CGRectMake(0, 200, 320, searchController.searchBar.frame.size.height)];
[self.view addSubview:searchController.searchBar];

在按钮上单击将 searchBar 添加到 navigationItem 这按预期工作

[self.navigationController setNavigationBarHidden:false];
self.navigationItem.titleView = searchController.searchBar;
self.navigationItem.hidesBackButton = true;

这是我得到奇怪行为的地方：

在另一个按钮上单击从导航栏中删除 searchBar 并将其添加回视图

[searchController.searchBar removeFromSuperview];
[self.navigationController setNavigationBarHidden:YES animated:true];
[self.view addSubview:searchController.searchBar];

[searchController.searchBar setFrame:CGRectMake(0, 200, 320, searchController.searchBar.frame.size.height)];

searchBar 按预期从导航栏中删除，但不会返回到主视图。（好吧，我在任何地方都看不到它）

我记录了搜索栏的值，我可以看到它有我给它的框架。

在这里的任何帮助将不胜感激，

谢谢

标签： iosobjective-cuinavigationcontroller

解决方案

您应该设置navigationItem .titleView为nil第一个并setFrame:在主线程中。

- (IBAction)addBar:(id)sender {
    self.navigationItem.titleView = nil;
    [searchController.searchBar removeFromSuperview];
    [self.navigationController setNavigationBarHidden:NO animated:YES];
    self.navigationItem.titleView = searchController.searchBar;
    self.navigationItem.hidesBackButton = YES;
}

- (IBAction)removeBar:(id)sender {
    self.navigationItem.titleView = nil;
    [searchController.searchBar removeFromSuperview];
    [self.view addSubview:searchController.searchBar];
    [self.navigationController setNavigationBarHidden:YES animated:YES];
    dispatch_async(dispatch_get_main_queue(), ^{
        [self->searchController.searchBar setFrame:CGRectMake(0, 200, 320, self->searchController.searchBar.frame.size.height)];
    });
}

顺便说一句，我认为UIView在添加到navigationItem.titleView.

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