搜索栏 - 导航栏中的取消按钮

Question

我正在导航栏中做搜索栏。当我编辑时，导航栏右侧没有取消按钮。

尝试过：

func searchBarTextDidBeginEditing(searchBar: UISearchBar) {

    var barButton = UIBarButtonItem(title: "Cancel", style: UIBarButtonItemStyle.Done, target: self, action: "")
    self.navigationItem.rightBarButtonItem = barButton
}

编辑：

我像这样将搜索栏添加到导航栏：

lazy var searchBar:UISearchBar = UISearchBar(frame: CGRectMake(0, 0, 300, 20))

        searchBar.placeholder = "Hľadať"
        searchBar.barStyle = UIBarStyle.BlackTranslucent
        var leftNavBarButton = UIBarButtonItem(customView:searchBar)
        self.navigationItem.leftBarButtonItem = leftNavBarButton

Answer 1

这样做：

func searchBarShouldBeginEditing(searchBar: UISearchBar) -> Bool {
    var cancelSearchBarButtonItem = UIBarButtonItem(title: "Cancel", style: UIBarButtonItemStyle.Plain, target: self, action: "cancelBarButtonItemClicked")
    self.navigationItem.setRightBarButtonItem(cancelSearchBarButtonItem, animated: true)
    return true
}

并且在 "Cancel" 处理程序中：

func searchBarCancelButtonClicked(searchBar: UISearchBar) {
    // closes the keyboard
    searchBar.resignFirstResponder()

    // If you are using a search controller
    // self.searchDisplayControllerCustom.setActive(false, animated: true)

    // remove the cancel button
    self.navigationItem.setRightBarButtonItem(nil, animated: true)
}

func cancelBarButtonItemClicked() {
    self.searchBarCancelButtonClicked(self.searchBar)
}

并为导航栏标题文本设置正确的颜色：

// This sets the textcolor for all navigation bars in the app
// Do this in the app delegate on startup
UINavigationBar.appearance().titleTextAttributes = [NSForegroundColorAttributeName : UIColor.whiteColor()]

并添加代表：

searchBar.delegate = self

Answer 2

如果这是 Objective-C 答案：

- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar
{
    [searchBar setShowsCancelButton:YES];
}

那么这可能是 Swift 答案：（不是 100% 确定）

func searchBarTextDidBeginEditing(searchBar: UISearchBar) {
    searchBar.showsCancelButton = true
}

记得link你的代理人。

来源：UISearchBar Class Reference

搜索栏 - 导航栏中的取消按钮

Search Bar - Cancel Button in Navigation Bar

button

ios

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swift