如何在Swift中将TextField添加到UIAlertView

Question

我有这个代码,但我不知道如何在UIAlertView中显示文本字段.

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)

我有这个代码用于textfield,如何在UIAlerView中显示它

var my:UITextField = UITextField(frame: CGRectMake(0, 0, 10, 10))

---

我也试过这段代码:

var alert = UIAlertView()
alert.title = "Enter Input"
alert.addButtonWithTitle("Done")
alert.alertViewStyle = UIAlertViewStyle.PlainTextInput
alert.addButtonWithTitle("Cancel")
alert.show()

当我指定AlertStyle明文,它显示了默认占位符一个TextField,"登录".我想改变这种状况,我想说明小数垫的键盘.我还想处理用户输入textField的值.有人可以帮我弄这个吗？

Answer 1

您可以使用以下方式访问文本字段:

let textField = alert.textFieldAtIndex(0)

然后更改占位符文本:

textField.placeholder = "Foo!"

和键盘类型:

textField.keyboardType = ...

Answer 2

试试这个代码(快速):

func configurationTextField(textField: UITextField!)
    {
        println("configurat hire the TextField")

        if let tField = textField {

            self.textField = textField!        //Save reference to the UITextField
            self.textField.text = "Hello world"
        }
    }


 func handleCancel(alertView: UIAlertAction!)
        {
           println("User click Cancel button") 
           println(self.textField.text)
        }

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

    alert.addTextFieldWithConfigurationHandler(configurationTextField)

    alert.addAction(UIAlertAction(title: "Close", style: UIAlertActionStyle.Cancel, handler:handleCancel))
    alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default, handler:{ (UIAlertAction)in
            println("User click Ok button")
            println(self.textField.text)
        }))
    self.presentViewController(alert, animated: true, completion: {
            println("completion block")
        })

你能在这里看到我的答案吗？

Answer 3

在目标C中

 UIAlertView *alertView =  [[UIAlertView alloc]initWithTitle:@"Duplicate file" message:@"A file with the same name already exists." delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
 alertView.alertViewStyle = UIAlertViewStylePlainTextInput;

 [[alertView textFieldAtIndex:0] setText:@"Filename"];
 [[alertView textFieldAtIndex:0] setPlaceholder:@"Enter Filename"];
 [alertView show];

在Swift 2.3中

func doSomething(){
    var alert = UIAlertController(title: "Duplicate file", message: "A file with the same name already exists.", preferredStyle: UIAlertControllerStyle.Alert)

    alert.addTextFieldWithConfigurationHandler(configurationTextField)

    alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default, handler:{ (UIAlertAction)in
         print("User click Ok button")
         print(self.textField.text)
    }))

 self.presentViewController(alert, animated: true, completion: {
     print("completion block")
 })
}

 func configurationTextField(textField: UITextField!){
     textField.text = "Filename"
 }

在Swift 3中

func doSomething(){
    var alert = UIAlertController(title: "Duplicate file", message: "A file with the same name already exists.", preferredStyle: UIAlertControllerStyle.alert)

    alert.addTextField(configurationHandler: configurationTextField)

    alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler:{ (UIAlertAction)in
        print("User click Ok button")
        print(self.textField.text)
    }))

    self.present(alert, animated: true, completion: {
        print("completion block")
    })
}

func configurationTextField(textField: UITextField!){
    textField.text = "Filename"
}

Answer 4

            var inputTextField: UITextField?

            //Create the AlertController
            let actionSheetController: UIAlertController = UIAlertController(title: "Rename", message: "", preferredStyle: .Alert)

            //Create and add the Cancel action
            let cancelAction: UIAlertAction = UIAlertAction(title: "Cancel", style: .Cancel) { action -> Void in
        //Do some stuff
            }
            actionSheetController.addAction(cancelAction)
            //Create and an option action
            let nextAction: UIAlertAction = UIAlertAction(title: "OK", style: .Default) { action -> Void in
        //Do some other stuff
            }
            actionSheetController.addAction(nextAction)
            //Add a text field
            actionSheetController.addTextFieldWithConfigurationHandler { textField -> Void in
        // you can use this text field
        inputTextField = textField
            }

            //Present the AlertController
            self.presentViewController(actionSheetController, animated: true, completion: nil)

Answer 5

在Swift 3中

    let alert = UIAlertController(title: "Alert Ttitle", message: "Alert Message", preferredStyle:
        UIAlertControllerStyle.alert)

    alert.addTextField(configurationHandler: textFieldHandler)

    alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler:{ (UIAlertAction)in


    }))

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

func textFieldHandler(textField: UITextField!)
    {
        if (textField) != nil {
            textField.text = "Filename"
        }
    }

Answer 6

斯威夫特 5

public func alertWithTextField(title: String? = nil, message: String? = nil, placeholder: String? = nil, completion: @escaping ((String) -> Void) = { _ in }) {
    let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
    alert.addTextField() { newTextField in
        newTextField.placeholder = placeholder
    }
    alert.addAction(UIAlertAction(title: "Cancel", style: .cancel) { _ in completion("") })
    alert.addAction(UIAlertAction(title: "Ok", style: .default) { action in
        if
            let textFields = alert.textFields,
            let tf = textFields.first,
            let result = tf.text
        { completion(result) } 
        else
        { completion("") }
    })
    navigationController?.present(alert, animated: true)
}

用法：

alertWithTextField(title: "bork", message: "borkborkbork", placeholder: "bork?") { result in
    print(result)
}

Answer 7

斯威夫特4：

var textField: UITextField?

func configurationTextField(textField: UITextField!) {
    if (textField) != nil {
        self.textField = textField!        //Save reference to the UITextField
        self.textField?.placeholder = "Some text";
    }
}

func openAlertView() {
    let alert = UIAlertController(title: "Alert Title", message: "Alert Message", preferredStyle: UIAlertControllerStyle.alert)
    alert.addTextField(configurationHandler: configurationTextField)
    alert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler:nil))
    alert.addAction(UIAlertAction(title: "Ok", style: .default, handler:{ (UIAlertAction) in
        print("User click Ok button")
    }))
    self.present(alert, animated: true, completion: nil)
}