iOS文本字段不辞职第一响应者 [英] iOS text field not resigning first responder

问题描述

我似乎无法为文本字段辞去第一响应者的职务.请帮忙，我在stackoverflow上查看了其他解决方案，但找不到解决方案.这是抛出的错误unrecognized selector sent to instance

I can't seem to resign first responder for text field. Please help and I have looked at other solutions on stackoverflow but can't find the solution. Here is the error thrown unrecognized selector sent to instance

 class ViewController: UIViewController, UITextFieldDelegate {

    @IBOutlet var textInputScreen: UITextField!

    override func viewDidLoad() {
       super.viewDidLoad()
       textInputScreen.delegate = self
    }

    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
       // textField.canResignFirstResponder is true 
       textField.resignFirstResponder() // throws error
       // view.endEditing(true) // throws same error
       // textInputScreen.resignFirstResponder() // throws same error
       return true
    }

推荐答案

最常见的情况是您的 TextField 至少有一个不链接到任何内容的引用出口.如果您可以再次查看您的故事板，您可能会看到类似这样的内容.

The most common case is your TextField has at least one referencing outlet which does not link to anything. If you can take a look again at your storyboard, you might see something like this.

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