Swift：searchBar - 如何更改＆＃34;取消＆＃34;按钮标题

Question

我有UIViewController，它采用了UISearchBarDelegate。并使用以下命令将其委托设置为self：resultSearchController.searchBar.delegate = self。它运行正常我用searchBarCancelButtonClicked方法％

测试它

func searchBarCancelButtonClicked(searchBar: UISearchBar) {
        println("Сancel button tapped")
    }

我在控制台中看到“Сancel按钮轻敲”。但我想改变“取消”按钮标题，我不知道如何。我尝试过：

func searchBarTextDidBeginEditing(searchBar: UISearchBar) {      
        var barButton = UIBarButtonItem(title: "Button Title", style: UIBarButtonItemStyle.Done, target: self, action: "here")
        self.resultSearchController.searchBar.showsCancelButton = false
        self.resultSearchController.navigationItem.rightBarButtonItem = barButton
    }

但它不起作用。你能帮帮我吗？

Answer 1

尝试使用setValue访问按钮文本，如下所示：

Swift 4

searchController.searchBar.setValue("New Title", forKey: "cancelButtonText")

它对我有用:)

Answer 2

func searchDisplayControllerWillBeginSearch(controller: UISearchDisplayController) {
    self.searchDisplayController?.searchBar.showsCancelButton = true
    var cancelButton: UIButton
    var topView: UIView = self.searchDisplayController?.searchBar.subviews[0] as UIView
    for subView in topView.subviews {
        if subView.isKindOfClass(NSClassFromString("UINavigationButton")) {
            cancelButton = subView as UIButton
            cancelButton.setTitle("Vazgeç", forState: UIControlState.Normal)
        }
    }
}

Answer 3

首先，您需要在导航控制器中显示自定义搜索栏按钮，如

  

在ViewDidLoad（）

中      

self.searchDisplayController？.displaysSearchBarInNavigationBar = true

并在Delegate Method

中

func searchBarTextDidBeginEditing(searchBar: UISearchBar) {

    var barButton = UIBarButtonItem(title: "Button Title", style: UIBarButtonItemStyle.Done, target: self, action: "here")
    self.searchDisplayController?.navigationItem.rightBarButtonItem = barButton
}

Answer 4

我通过在UISearchBar对象中查找UIButton指针解决了这个问题。我的项目中有Objective-c代码，但你可以看到逻辑。

- (BOOL)searchBarShouldBeginEditing:(UISearchBar *)searchBar {

    [searchBar setShowsCancelButton:YES animated:YES];

    for (UIView *ob in ((UIView*)searchBar.subviews[0]).subviews) {
        if ([ob isKindOfClass:[UIButton class]]) {
            UIButton *btn = (UIButton*)ob;
            [btn setTitle:@"İptal" forState:UIControlStateNormal];
        }
    }
    return YES;
}

Answer 5

选中此answer。

上述答案的示例已为Swift 5更新：

if let cancelButton = searchController.searchBar.value(forKey: "cancelButton") as? UIButton {
    cancelButton.setTitle(<your_string>, for: <UIControlState>)
    cancelButton.setTitleColor(<your_uicolor>, for: <UIControlState>)
    cancelButton.setAttributedTitle(<your_nsattributedstring>, for: <UIControlState>)
}

Answer 6

在初始化搜索控制器后，将其放入视图控制器的viewDidLoad()中。

UIBarButtonItem.appearance(whenContainedInInstancesOf: [UISearchBar.self]).title = "your button title"

Answer 7

对于 Swift 5

searchBar.delegate = self

func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
     let cBtn = searchBar.value(forKey: "cancelButton") as! UIButton
     cBtn.setTitle("MyCustomText", for: .normal)
}