ios - UIViewController 中的 UISearchBar

Question

我正在尝试以编程方式将搜索栏添加到 UIView(不是 UITableView)。目前，我只是尝试正确设置代表，以便当我单击“输入”按钮时，会打印一条消息:

- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar {
    NSLog(@"enter button clicked");
    [searchBar resignFirstResponder];
}

我已经有一些代码适用于 UITableViewController我正在努力适应。它看起来像这样(我跳过了与当前讨论无关的所有代码部分):

@property (nonatomic, strong) UISearchController *searchController;
@property (nonatomic, strong) UITableViewController *resultsTableController;


- (void)viewDidLoad {
    [super viewDidLoad];
    self.resultsTableController = [[SearchResultsController alloc] init];
    self.searchController = [[UISearchController alloc] initWithSearchResultsController:self.resultsTableController];
    self.searchController.searchResultsUpdater = self;
    [self.searchController.searchBar sizeToFit];
    self.searchController.delegate = self;
    self.searchController.searchBar.delegate = self;
    self.definesPresentationContext = YES;

    self.tableView.tableHeaderView = self.searchController.searchBar;
}

现在唯一没有转置为 UIViewController 的行案例是最后一个

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

我的 UIViewController使用包含 UIView 的 xib 定义调用 myView和 UISearchBar调用 searchBar .所以我试着做

self.myView = self.searchController.searchBar;

或者

self.searchBar = self.searchController.searchBar;

但在第一种情况下 searchBar甚至没有显示，在第二种情况下，委托(delegate) self似乎丢失了(当我单击输入时没有任何 react )。

我究竟做错了什么 ？

Answer 1

这是您以编程方式将 UISearchBar 添加到 UIViewController 的方式:

self.searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0.0, 0.0, kScreenWidth, 40.0)];
self.searchBar.autocorrectionType = UITextAutocorrectionTypeNo;
self.searchBar.autocapitalizationType = UITextAutocapitalizationTypeNone;
self.searchBar.autoresizingMask = UIViewAutoresizingFlexibleWidth;
self.searchBar.tintColor = kRunnerSearchBarTintColor;

if ([RunnerUtilities isIOS7orAbove]) {
    self.searchBar.searchBarStyle = UISearchBarStyleProminent;
    [self.searchBar setBarTintColor:[UIColor colorWithRed:185.0/255.0 green:195.0/255.0 blue:202.2/255.0 alpha:0]];
}

self.searchBar.delegate = self;
[self.view addSubview:self.searchBar];

好吧，这与从 XIB 文件中添加它没有什么不同。首先，搜索栏是作为 View Controller View 的 subview 添加的，应该连接到 ViewController 中定义的搜索栏导出。其次，UIViewController 必须设置为搜索栏的委托(delegate)。请确保您遵循这一点，这应该有效。

编辑::

如果您尝试在 UIViewController 中使用 UISearchController，请尝试以下代码:

- (void)viewDidLoad
{        
    [super viewDidLoad];
    // Do any custom init from here...

    // Create a UITableViewController to present search results since the actual view controller is not a subclass of UITableViewController in this case
    UITableViewController *searchResultsController = [[UITableViewController alloc] init];

    // Init UISearchController with the search results controller
    self.searchController = [[UISearchController alloc] initWithSearchResultsController:searchResultsController];

    // Link the search controller
    self.searchController.searchResultsUpdater = self;

    // This is obviously needed because the search bar will be contained in the navigation bar
    self.searchController.hidesNavigationBarDuringPresentation = NO;

    // Required (?) to set place a search bar in a navigation bar
    self.searchController.searchBar.searchBarStyle = UISearchBarStyleMinimal;

    // This is where you set the search bar in the navigation bar, instead of using table view's header ...
    self.navigationItem.titleView = self.searchController.searchBar;

    // To ensure search results controller is presented in the current view controller
    self.definesPresentationContext = YES;

    // Setting delegates and other stuff
    searchResultsController.tableView.dataSource = self;
    searchResultsController.tableView.delegate = self;
    self.searchController.delegate = self;
    self.searchController.dimsBackgroundDuringPresentation = NO;
    self.searchController.searchBar.delegate = self;        
}