带有 OK 和 Cancel 的 Swift 警报视图：点击了哪个按钮？答案

【问题标题】：Swift alert view with OK and Cancel: which button tapped?带有 OK 和 Cancel 的 Swift 警报视图：点击了哪个按钮？
【发布时间】：2014-10-20 03:22:07
【问题描述】：

我在 Xcode 中有一个用 Swift 编写的警报视图，我想确定用户选择了哪个按钮（它是一个确认对话框）什么都不做或执行什么。

目前我有：

@IBAction func pushedRefresh(sender: AnyObject) {
    var refreshAlert = UIAlertView()
    refreshAlert.title = "Refresh?"
    refreshAlert.message = "All data will be lost."
    refreshAlert.addButtonWithTitle("Cancel")
    refreshAlert.addButtonWithTitle("OK")
    refreshAlert.show()
}

我可能用错了按钮，请纠正我，因为这对我来说是全新的。

【问题讨论】：

复制到stackoverflow.com/questions/24195310/…

标签： xcode dialog swift alert confirmation

【解决方案1】：

如果您使用的是 iOS8，则应该使用 UIAlertController — UIAlertView 是 deprecated。

以下是如何使用它的示例：

var refreshAlert = UIAlertController(title: "Refresh", message: "All data will be lost.", preferredStyle: UIAlertControllerStyle.Alert)

refreshAlert.addAction(UIAlertAction(title: "Ok", style: .Default, handler: { (action: UIAlertAction!) in
  print("Handle Ok logic here")
  }))

refreshAlert.addAction(UIAlertAction(title: "Cancel", style: .Cancel, handler: { (action: UIAlertAction!) in
  print("Handle Cancel Logic here")
  }))

presentViewController(refreshAlert, animated: true, completion: nil)

您可以看到 UIAlertAction 的块处理程序处理按钮按下。一个很棒的教程在这里（尽管本教程不是使用 swift 编写的）： http://hayageek.com/uialertcontroller-example-ios/

Swift 3 更新：

let refreshAlert = UIAlertController(title: "Refresh", message: "All data will be lost.", preferredStyle: UIAlertControllerStyle.alert)

refreshAlert.addAction(UIAlertAction(title: "Ok", style: .default, handler: { (action: UIAlertAction!) in
    print("Handle Ok logic here")
}))

refreshAlert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: { (action: UIAlertAction!) in
    print("Handle Cancel Logic here")
}))

present(refreshAlert, animated: true, completion: nil)

Swift 5 更新：

let refreshAlert = UIAlertController(title: "Refresh", message: "All data will be lost.", preferredStyle: UIAlertControllerStyle.alert)

refreshAlert.addAction(UIAlertAction(title: "Ok", style: .default, handler: { (action: UIAlertAction!) in
      print("Handle Ok logic here")
}))

refreshAlert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: { (action: UIAlertAction!) in
      print("Handle Cancel Logic here")
}))

present(refreshAlert, animated: true, completion: nil)

Swift 5.3 更新：

let refreshAlert = UIAlertController(title: "Refresh", message: "All data will be lost.", preferredStyle: UIAlertController.Style.alert)

refreshAlert.addAction(UIAlertAction(title: "Ok", style: .default, handler: { (action: UIAlertAction!) in
      print("Handle Ok logic here")
}))

refreshAlert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: { (action: UIAlertAction!) in
      print("Handle Cancel Logic here")
}))

present(refreshAlert, animated: true, completion: nil)

【讨论】：

您可以在示例中使用UIAlertActionStyle.Cancel 而不是.Default。
如果我想在取消操作中什么都不做，我可以什么都不返回？
当然，从技术上讲，我在示例中除了记录之外什么也没做。但是，如果我删除了日志，我将什么也不做。
为较新的 Swift 版本更新答案真是太棒了
任何人都知道如何将辅助功能 ID 添加到“确定”和“取消”操作

【解决方案2】：

var refreshAlert = UIAlertController(title: "Log Out", message: "Are You Sure to Log Out ? ", preferredStyle: UIAlertControllerStyle.Alert)

refreshAlert.addAction(UIAlertAction(title: "Confirm", style: .Default, handler: { (action: UIAlertAction!) in
    self.navigationController?.popToRootViewControllerAnimated(true)
}))

refreshAlert.addAction(UIAlertAction(title: "Cancel", style: .Default, handler: { (action: UIAlertAction!) in

    refreshAlert .dismissViewControllerAnimated(true, completion: nil)


}))

presentViewController(refreshAlert, animated: true, completion: nil)

【讨论】：

更新 Swift 5.3：refreshAlert.dismiss(animated: true, completion: nil)

【解决方案3】：

您可以使用 UIAlertController 轻松做到这一点

let alertController = UIAlertController(
       title: "Your title", message: "Your message", preferredStyle: .alert)
let defaultAction = UIAlertAction(
       title: "Close Alert", style: .default, handler: nil)
//you can add custom actions as well 
alertController.addAction(defaultAction)

present(alertController, animated: true, completion: nil)

。

参考：iOS Show Alert

【讨论】：

【解决方案4】：

为 swift 3 更新：

//函数定义：

@IBAction func showAlertDialog(_ sender: UIButton) {
        // Declare Alert
        let dialogMessage = UIAlertController(title: "Confirm", message: "Are you sure you want to Logout?", preferredStyle: .alert)

        // Create OK button with action handler
        let ok = UIAlertAction(title: "OK", style: .default, handler: { (action) -> Void in
             print("Ok button click...")
             self.logoutFun()
        })

        // Create Cancel button with action handlder
        let cancel = UIAlertAction(title: "Cancel", style: .cancel) { (action) -> Void in
            print("Cancel button click...")
        }

        //Add OK and Cancel button to dialog message
        dialogMessage.addAction(ok)
        dialogMessage.addAction(cancel)

        // Present dialog message to user
        self.present(dialogMessage, animated: true, completion: nil)
    }

// logoutFun() 函数定义：

func logoutFun()
{
    print("Logout Successfully...!")
}

【讨论】：

【解决方案5】：

您可能需要考虑使用 SCLAlertView，替代 UIAlertView 或 UIAlertController。

UIAlertController 仅适用于 iOS 8.x 或更高版本，SCLAlertView 是支持旧版本的不错选择。

github查看详情

示例：

let alertView = SCLAlertView()
alertView.addButton("First Button", target:self, selector:Selector("firstButton"))
alertView.addButton("Second Button") {
    print("Second button tapped")
}
alertView.showSuccess("Button View", subTitle: "This alert view has buttons")

【讨论】：

【解决方案6】：

非常简单
第 1 步：创建一个新类

    class AppAlert: NSObject {
    
    //Singleton class
    static let shared = AppAlert()
    
    //MARK: - Delegate
    
    var onTapAction : ((Int)->Void)?
    
    //Simple Alert view
    public func simpleAlert(view: UIViewController, title: String?, message: String?){
        ToastManager.show(title: title ?? "", state: .error)
    }
    
    //Simple Alert view with button one
    public func simpleAlert(view: UIViewController, title: String, message: String, buttonTitle: String) {
        
        let alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertController.Style.alert)
        //okButton Action
        let okButton = UIAlertAction(title: buttonTitle, style: UIAlertAction.Style.default) {
            (result : UIAlertAction) -> Void in
            self.onTapAction?(0)
        }
        alert.addAction(okButton)
        view.present(alert, animated: true, completion: nil)
    }
    
    //Simple Alert view with two button
    public func simpleAlert(view: UIViewController, title: String, message: String, buttonOneTitle: String, buttonTwoTitle: String){
        let alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertController.Style.alert)
        
        //Button One Action
        let buttonOne = UIAlertAction(title: buttonOneTitle, style: UIAlertAction.Style.default) {
            (result : UIAlertAction) -> Void in
            self.onTapAction?(0)
        }
        
        //Button Two Action
        let buttonTwo = UIAlertAction(title: buttonTwoTitle, style: UIAlertAction.Style.default) {
            (result : UIAlertAction) -> Void in
            self.onTapAction?(1)
        }
        alert.addAction(buttonOne)
        alert.addAction(buttonTwo)
        view.present(alert, animated: true, completion: nil)
    }
    
}

第 2 步：调用为

AppAlert.shared.simpleAlert(view: self, title: "Register First", message: "Please Register to Proceed", buttonOneTitle: "Cancel", buttonTwoTitle: "OK")
        AppAlert.shared.onTapAction = { [weak self] tag in
            guard let self = self else {
                return
            }
            if tag == 0 {
               
            }else if tag == 1 {
                
            }
        }

【讨论】：

【解决方案7】：

swift 5 的小更新：

let refreshAlert = UIAlertController(title: "Refresh", message: "All data will be lost.", preferredStyle: UIAlertController.Style.alert)

    refreshAlert.addAction(UIAlertAction(title: "Ok", style: .default, handler: { (action: UIAlertAction!) in
          print("Handle Ok logic here")
    }))

    refreshAlert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: { (action: UIAlertAction!) in
          print("Handle Cancel Logic here")
    }))

    self.present(refreshAlert, animated: true, completion: nil)

【讨论】：