ios - UIAlertView 在 Swift 中不工作

Question

当我快速运行这段代码时，我不知道为什么应用程序会在“alertView.show()”部分显示一个断点而终止，请有人帮助我。

var alertView = UIAlertView(
    title: "Hey",
    message: "Hello",
    delegate: self,
    cancelButtonTitle: "Cancel"
)
alertView.show()

Answer 1

来自 Xcode 6.0 UIAlertView 类:

UIAlertView is deprecated. Use UIAlertController with a preferredStyle of UIAlertControllerStyleAlert instead.

在 swift(iOS 8 和 OS X 10.10)上，你可以这样做:

var alert = UIAlertController(title: "Alert Title", message: "Alert Message", preferredStyle: UIAlertControllerStyle.Alert)
        alert.addAction(UIAlertAction(title: "Close", style: UIAlertActionStyle.Cancel, handler:handleCancel))
        alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default, handler:{ (ACTION :UIAlertAction!)in
                println("User click Ok button")
            }))
        self.presentViewController(alert, animated: true, completion: nil)

func handleCancel(alertView: UIAlertAction!)
        {
            println("User click cancel button")
        }

如果您想在“ActionSheet”中使用而不是“Alert”，您只需更改 UIAlertControllerStyle，例如:

var alert = UIAlertController(title: "Alert Title", message: "Alert Message", preferredStyle: UIAlertControllerStyle.ActionSheet)