iOS Swift 点击空白区域收起键盘代码不生效问题咨询

问题原因 #

代码中创建手势识别器时误用了抽象基类UIGestureRecognizer，该类是所有手势识别器的父类，不具备具体的事件识别能力，无法响应点击操作，因此绑定的收起键盘方法不会被触发。

修复方法 #

将手势识别器替换为可响应点击事件的具体子类UITapGestureRecognizer即可，修正后核心代码如下：

override func viewDidLoad() {
    super.viewDidLoad()
    // 替换为点击手势识别器
    let gestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(klavyeyiKapat))
    view.addGestureRecognizer(gestureRecognizer)
}

完整可运行代码：

import UIKit

class DetailsViewController: UIViewController {

    @IBOutlet weak var imageLabel: UIImageView!
    @IBOutlet weak var urunAdiLabel: UITextField!
    @IBOutlet weak var urunBedeniLabel: UITextField!
    @IBOutlet weak var urunFiyatiLabel: UITextField!
    
    override func viewDidLoad() {
        super.viewDidLoad()
    
        let gestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(klavyeyiKapat))
        // 如果后续出现手势拦截按钮、输入框点击的问题，可打开下面这行配置
        // gestureRecognizer.cancelsTouchesInView = false
        view.addGestureRecognizer(gestureRecognizer)
    }
    
    @IBAction func kaydetButonuTiklandi(_ sender: Any) {
    }
    
    @objc func klavyeyiKapat () {
        view.endEditing(true)
    }
}

运行效果参考 #

内容的提问来源于stack exchange，提问作者Umutcan Bostancı