未调用 UITextFieldDelegate 方法 [英] UITextFieldDelegate method not called

问题描述

我正在关注 Big Nerd Ranch iOS 编程书籍(Swift 版)并且我有这个文件.

I'm following the Big Nerd Ranch iOS Programming book (Swift version) and I have this file.

import UIKit

class ConversionViewController: UIViewController, UITextFieldDelegate {

    @IBOutlet var celsiusLabel: UILabel!
    @IBOutlet var textField: UITextField!

    func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
        print("here")
        return true
    }

    //rest of the code here
}

由于某种原因，没有调用 textField 委托方法.我在控制台中看不到此处"日志.我已经多次检查命名和语法.有什么想法吗?

For some reason, the textField delegate method is not called. I can't see the "here" log in my console. I have double checked the naming and syntax a lot of times. Any ideas?

推荐答案

您需要将文本字段的委托设置为 self.

You need set delegate of your text field to self.

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

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