Question

当我在swift中使用此代码时，我不知道为什么应用程序通过在“alertView.show（）”部分中显示断点来终止，有人请帮帮我。

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

Answer 1

来自Xcode 6.0 UIAlertView类：

UIAlertView已弃用。将UIAlertController与preferredStyle一起使用取而代之的是UIAlertControllerStyleAlert。

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")
        }

如果你想在'ActionSheet'中使用'Alert'，你只需要更改UIAlertControllerStyle，例如：

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

Answer 2

UIAlertView在iOS 8中已弃用，但Swift支持iOS7，您无法在iOS 7上使用UIAlertController。添加以下方法来解决问题：

func showAlert(title:NSString, message:NSString,owner:UIViewController) {
    if let gotModernAlert: AnyClass = NSClassFromString("UIAlertController") {
        var alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.Alert)
        alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
        owner.presentViewController(alert, animated: true, completion: nil)
    }
    else {
        let alertView = UIAlertView(title: title, message: message, delegate: self, cancelButtonTitle: "Cancel", otherButtonTitles: "OK")
        alertView.alertViewStyle = .Default
        alertView.show()
    }
}

并从代码中调用该方法，如下所示：

showAlert(APP_NAME,message: "Add your alert message here" ,owner: self)

Answer 3

对我来说最好的方式是......

class ViewController: UIViewController, UIAlertViewDelegate {
var allarme = UIAlertView(title: "Warning", message: "This is a best way to create a alarm message", delegate: self, cancelButtonTitle: "OK")
        allarme.show()

记得在UIAlertViewDelegate类上导入

Answer 4

使用以下方式：

var altMessage = UIAlertController(title: "Warning", message: "This is Alert Message", preferredStyle: UIAlertControllerStyle.Alert)
altMessage.addAction(UIAlertAction(title: "Done", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(altMessage, animated: true, completion: nil)

UIAlertView在Swift中不起作用

4 个答案: