iOS - 跳至下個輸入框

若一個畫面中有多個輸入框, 當輸入完之後, 想要自動跳至下個輸入框,

就算Storyboard中設置為Next, 依舊是無法自動跳轉的, 此時需要使用程式來控制.

Step 1: Reference TextFields and 註冊UITextFieldDelegate

import UIKit

class ViewController: UIViewController {
    @IBOutlet weak var nameField: UITextField!
    @IBOutlet weak var bdField: UITextField!
    @IBOutlet weak var heightField: UITextField!
    @IBOutlet weak var weightField: UITextField!
    @IBOutlet weak var idField: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()
        nameField.delegate = self;
        bdField.delegate = self;
        heightField.delegate = self;
        weightField.delegate = self;
        idField.delegate = self;
    }
}

Step 2: 監聽Return Key

extension ViewController : UITextFieldDelegate {
    func textFieldShouldReturn(textField: UITextField) -> Bool {
        return true
    }
}

Step 3: 跳轉控制

extension ViewController : UITextFieldDelegate {
    func textFieldShouldReturn(textField: UITextField) -> Bool {
        if textField == self.nameField {
            self.bdField.becomeFirstResponder()
        } else if textField == self.bdField {
            self.heightField.becomeFirstResponder()
        } else if textField == self.heightField {
            self.weightField.becomeFirstResponder()
        } else if textField == self.weightField {
            self.idField.becomeFirstResponder()
        } else {
            //nothing else
        }
        return true
    }
}

Source Code

import UIKit

class ViewController: UIViewController {
    @IBOutlet weak var nameField: UITextField!
    @IBOutlet weak var bdField: UITextField!
    @IBOutlet weak var heightField: UITextField!
    @IBOutlet weak var weightField: UITextField!
    @IBOutlet weak var idField: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()
        nameField.delegate = self;
        bdField.delegate = self;
        heightField.delegate = self;
        weightField.delegate = self;
        idField.delegate = self;
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}

extension ViewController : UITextFieldDelegate {
    func textFieldShouldReturn(textField: UITextField) -> Bool {
        if textField == self.nameField {
            self.bdField.becomeFirstResponder()
        } else if textField == self.bdField {
            self.heightField.becomeFirstResponder()
        } else if textField == self.heightField {
            self.weightField.becomeFirstResponder()
        } else if textField == self.weightField {
            self.idField.becomeFirstResponder()
        } else {
            //nothing else
        }

        return true
    }
}