Ios 试图用“返回”按钮关闭键盘

我正在构建一个待办事项列表应用程序，我想让它在用户键入时按return键时关闭并消失。我以为我写的函数是正确的，但它不起作用。我在最后询问的代码

import UIKit

class SecondViewController: UIViewController {

    @IBOutlet var addLabel: UILabel!


    @IBOutlet var enteredItem: UITextField!


    @IBAction func addItemButton(sender: AnyObject) {

        toDoList.append(enteredItem.text)

        enteredItem.text = ""

        NSUserDefaults.standardUserDefaults().setObject(toDoList, forKey: "toDoList")

    }


    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {

        self.view.endEditing(true)

    }

    func textFieldShouldReturn(textField: UITextField!) -> Bool {

        textField.resignFirstResponder()

        return true

    }

}

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你错过了两件事

SecondViewController必须实现UITextFieldDelegate

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是否已将textField的委托设置为此viewController？如果在textfield中放置断点，则应返回textfield:UITextField！->你打过吗？谢谢。我还是个初学者，我需要熟练掌握这个过程。我不知道你必须采取这两个步骤。 class SecondViewController: UIViewController, UITextFieldDelegate override func viewDidLoad() { super.viewDidLoad() self.enteredItem.delegate = self; }