如何使用 Swift iOS 向 UIAlertView 按钮添加操作答案

【问题标题】：How to add an action to a UIAlertView button using Swift iOS如何使用 Swift iOS 向 UIAlertView 按钮添加操作
【发布时间】：2014-08-03 10:08:09
【问题描述】：

我想添加另一个按钮，而不是“确定”按钮，它应该只是关闭警报。我想让另一个按钮调用某个函数。

var logInErrorAlert: UIAlertView = UIAlertView()
logInErrorAlert.title = "Ooops"
logInErrorAlert.message = "Unable to log in."
logInErrorAlert.addButtonWithTitle("Ok")

如何向此警报添加另一个按钮，然后允许它在单击后调用一个函数，因此假设我们希望调用新按钮：

 retry()

【问题讨论】：

标签： ios uialertview swift

【解决方案1】：

Swifty 的方式是使用新的 UIAlertController 和闭包：

    // Create the alert controller
    let alertController = UIAlertController(title: "Title", message: "Message", preferredStyle: .Alert)

    // Create the actions
    let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default) {
        UIAlertAction in
        NSLog("OK Pressed")
    }
    let cancelAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel) {
        UIAlertAction in
        NSLog("Cancel Pressed")
    }

    // Add the actions
    alertController.addAction(okAction)
    alertController.addAction(cancelAction)

    // Present the controller
    self.presentViewController(alertController, animated: true, completion: nil)

斯威夫特 3：

    // Create the alert controller
    let alertController = UIAlertController(title: "Title", message: "Message", preferredStyle: .alert)

    // Create the actions
    let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default) {
        UIAlertAction in
        NSLog("OK Pressed")
    }
    let cancelAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.cancel) {
        UIAlertAction in
        NSLog("Cancel Pressed")
    }

    // Add the actions
    alertController.addAction(okAction)
    alertController.addAction(cancelAction)

    // Present the controller
    self.present(alertController, animated: true, completion: nil)

【讨论】：

不幸的是，我目前正在使用 iOS 7.1，而 UIAlertController 仅在 iOS 8.0 + 中可用。所以我必须使用 UIAlertView
我做的和你一模一样，但错误没有出现，而是在日志中显示“警告，尝试在 <_ttc13nsalert_swift14viewcontroller:> 上显示，其视图不在窗口层次结构！”知道是什么问题吗？
在我的情况下，出现警报但按钮没有响应触摸。也就是说，“OK Pressed”和“Cancel Pressed”都没有出现。

【解决方案2】：

func showAlertAction(title: String, message: String){
    let alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertController.Style.alert)
    alert.addAction(UIAlertAction(title: "Ok", style: UIAlertAction.Style.default, handler: {(action:UIAlertAction!) in
        print("Action")
    }))
    alert.addAction(UIAlertAction(title: "Cancel", style: UIAlertAction.Style.default, handler: nil))
    self.present(alert, animated: true, completion: nil)
}

【讨论】：

【解决方案3】：

UIAlertViews 使用代理与您（客户）进行通信。

您添加第二个按钮，并创建一个对象来接收来自视图的委托消息：

class LogInErrorDelegate : UIAlertViewDelegate {

    init {}

    // not sure of the prototype of this, you should look it up
    func alertView(view :UIAlertView, clickedButtonAtIndex :Integer) -> Void {
        switch clickedButtonAtIndex {
            case 0: 
               userClickedOK() // er something
            case 1:
               userClickedRetry()
              /* Don't use "retry" as a function name, it's a reserved word */

            default:
               userClickedRetry()
        }
    }

    /* implement rest of the delegate */
}
logInErrorAlert.addButtonWithTitle("Retry")

var myErrorDelegate = LogInErrorDelegate()
logInErrorAlert.delegate = myErrorDelegate

【讨论】：

【解决方案4】：

Swift 4 更新

        // Create the alert controller
        let alertController = UIAlertController(title: "Title", message: "Message", preferredStyle: .alert)

        // Create the actions
        let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default) {
            UIAlertAction in
            NSLog("OK Pressed")
        }
        let cancelAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.cancel) {
            UIAlertAction in
            NSLog("Cancel Pressed")
        }

        // Add the actions
        alertController.addAction(okAction)
        alertController.addAction(cancelAction)

        // Present the controller
        self.present(alertController, animated: true, completion: nil)

【讨论】：

UIAlertActionStyle.default 重命名为 UIAlertAction.Style.default

【解决方案5】：

基于 swift：

let alertCtr = UIAlertController(title:"Title", message:"Message", preferredStyle: .Alert)
let Cancel = AlertAction(title:"remove", style: .Default, handler: {(UIAlertAction) -> Void in })
let Remove = UIAlertAction(title:"remove", style: .Destructive, handler:{(UIAlertAction)-> Void 
    inself.colorLabel.hidden = true    
})
alertCtr.addAction(Cancel)
alertCtr.addAction(Remove)

self.presentViewController(alertCtr, animated:true, completion:nil)}

【讨论】：

【解决方案6】：

Jake 答案的 Swift 3.0 版本

// 创建警报控制器

let alertController = UIAlertController(title: "Alert!", message: "There is no items for the current user", preferredStyle: .alert)

            // Create the actions
            let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default) {
                UIAlertAction in
                NSLog("OK Pressed")
            }
            let cancelAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.cancel) {
                UIAlertAction in
                NSLog("Cancel Pressed")
            }

            // Add the actions
            alertController.addAction(okAction)
            alertController.addAction(cancelAction)

            // Present the controller
            self.present(alertController, animated: true, completion: nil)

【讨论】：

【解决方案7】：

斯威夫特 5+

let alert = UIAlertController(title: "Cart!", message: "Are you sure want to remove order details?", preferredStyle: .alert)
        // Create the actions
let okAction = UIAlertAction(title: "YES", style: 
    UIAlertAction.Style.default) {
       UIAlertAction in
       print("Yes Pressed")
}
let cancelAction = UIAlertAction(title: "CANCEL", style: 
    UIAlertAction.Style.cancel) {
       UIAlertAction in
       print("Cancel Pressed")
    }
// Add the actions
alert.addAction(okAction)
alert.addAction(cancelAction)

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

或

let alert = UIAlertController(title: "Alert!", message: "Are you sure want to remove your request?", preferredStyle: .alert)
                // Create the actions
        let okAction = UIAlertAction(title: "YES", style: .destructive) {
               _ in
               print("Yes Pressed")
            self.funRemoveRequest(requestID: (self.requestStatusModel?.data?[sender.tag].id)!)
        }
        let cancelAction = UIAlertAction(title: "CANCEL", style: .cancel) {
               _ in
               print("Cancel Pressed")
            }
        // Add the actions
        alert.addAction(okAction)
        alert.addAction(cancelAction)

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

【讨论】：

【解决方案8】：

查看我的代码：

 @IBAction func foundclicked(sender: AnyObject) {

            if (amountTF.text.isEmpty)
            {
                let alert = UIAlertView(title: "Oops! Empty Field", message: "Please enter the amount", delegate: nil, cancelButtonTitle: "OK")

                alert.show()
            }

            else {

            var alertController = UIAlertController(title: "Confirm Bid Amount", message: "Final Bid Amount : "+amountTF.text , preferredStyle: .Alert)
            var okAction = UIAlertAction(title: "Confirm", style: UIAlertActionStyle.Default) {
                UIAlertAction in

                JHProgressHUD.sharedHUD.loaderColor = UIColor.redColor()
                        JHProgressHUD.sharedHUD.showInView(self.view, withHeader: "Amount registering" , andFooter: "Loading")
                }
            var cancelAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel) {
                UIAlertAction in

                alertController .removeFromParentViewController()
            }
                            alertController.addAction(okAction)
                            alertController.addAction(cancelAction)

                self.presentViewController(alertController, animated: true, completion: nil)

            }

        }

【讨论】：

【解决方案9】：

这适用于 swift 4.2、5 和 5+

let alert = UIAlertController(title: "ooops!", message: "Unable to login", preferredStyle: .alert)

alert.addAction(UIAlertAction(title: "Ok", style: .default, handler: nil))

self.present(alert, animated: true)

【讨论】：