搜索栏 - 导航栏中的取消按钮

Question

我正在导航栏中搜索栏。当我正在编辑时，我在导航栏的右侧没有取消按钮。

试过：

func searchBarTextDidBeginEditing(searchBar: UISearchBar) {

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

编辑：

我在搜索栏中添加了搜索栏，如下所示：

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

以这种方式做到：

// 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()]

在“取消”处理程序中：

searchBar.delegate = self

并为导航栏标题文本设置正确的颜色：

func randomInRangeScale(scale : CGFloat) -> CGFloat {
    let random = arc4random_uniform(UInt32(UInt16.max))
    let randomCGFloat = CGFloat(random)
    return randomCGFloat * 0.000015 + 0.8
}

添加委托：

{{1}}

Answer 2

如果这是Objective-C回答：

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

然后这可能是Swift的回答：（不是100％肯定）

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

请记住将您的代表与自己联系起来。

来源：UISearchBar Class Reference