如何显示和隐藏 UISearchDisplayController 的 UISearchBar

我有一个位于导航右侧的按钮搜索。 这是我的代码：

UIButton *btnSearch = [UIButton buttonWithType:UIButtonTypeCustom];
btnSearch.frame = CGRectMake(0, 0, 22, 22);
[btnSearch setImage:[UIImage imageNamed:@"search_btn.png"] forState:UIControlStateNormal];
[btnSearch addTarget:self action:@selector(showSearch:) forControlEvents:UIControlEventTouchUpInside];

UIBarButtonItem *searchItem = [[UIBarButtonItem alloc] initWithCustomView:_btnSearch];

self.navigationItem.rightBarButtonItems = searchItem ;

This is how it's look.

我想在单击搜索按钮后显示搜索栏，并在单击取消后关闭它，然后返回导航栏，但我不知道如何编码。

- (IBAction)showSearch:(id)sender{
    ???
}

This what I want.

请帮忙或提供一些示例代码。我真的很需要它。

感谢您的阅读。

添加属性UISearchBar *mySearchBar到你的 viewController 作为

@property(nonatomic, retain) UISearchBar *mySearchBar;

符合UISearchBarDelegate as

@interface HomeViewController () <UISearchBarDelegate>
...
...
@end

然后实施showSearch方法如

-(void)showSearch:(id)sender {
if(!mySearchBar) {
    mySearchBar = [[UISearchBar alloc] init];
    [mySearchBar setFrame:CGRectMake(0, 0, self.view.frame.size.width, 55)];
    [mySearchBar setShowsCancelButton:YES animated:YES];
    [self.view addSubview: mySearchBar];
    mySearchBar.delegate = self;
    self.navigationController.navigationBarHidden = YES;
}else {
    searchBar.alpha = 1.0;
    self.navigationController.navigationBarHidden = YES;
}

然后将搜索栏委托方法实现为：

 - (void)searchBarCancelButtonClicked:(UISearchBar *) searchBar {
        self.navigationController.navigationBarHidden = NO;
        [mySearchBar setAlpha:0.0];
    }

希望你通过这样做有了这个想法。如果您愿意，您也可以将其直接添加到导航控制器本身，然后使用显示/隐藏searchBar alone.

您可以将其添加到导航控制器，就像初始化一样mysearchBar并将其添加到navigationBar as :

   UIBarButtonItem *searchBarItem = [[UIBarButtonItem alloc] initWithCustomView:mySearchBar];
   self.navigationItem.rightBarButtonItem = searchBarItem;