UITapGestureRecognizer 静态方法崩溃

Posted 2023-02-27

【中文标题】UITapGestureRecognizer 静态方法崩溃

【英文标题】：UITapGestureRecognizer static method crashes

【发布时间】：2018-07-05 14:19:08

【问题描述】：

我有一个带有多个自定义UICollectionViewCells 的快速应用程序。所有单元格都有多个用户可以点击的对象（UIImageView 或 UILabel）（因此，我使用多个UITapGestureRecognizers 来调用相应的操作。现在，为了减轻我的工作并减少代码重复，我想创建一个 UITapGestureRecognizer 的 extension 和 static 方法，我可以直接在类上调用。

我做到了，但应用程序崩溃的事实意味着我做的不好。这是我的代码：

extension UITapGestureRecognizer 
    static func addNewTapGuestureRecognizer(for imageView: UIImageView, selectorName: Selector) 
        let tap = UITapGestureRecognizer(target: self, action: selectorName)
        imageView.addGestureRecognizer(tap)
        imageView.isUserInteractionEnabled = true
    

    static func addNewTapGuestureRecognizer(for label: UILabel, selectorName: Selector) 
        let tap = UITapGestureRecognizer(target: self, action: selectorName)
        label.addGestureRecognizer(tap)
        label.isUserInteractionEnabled = true
    


class TextCVC: UICollectionViewCell 

    override func awakeFromNib() 
        super.awakeFromNib()
        addTapGuesturesForImagesAndLabels()
    

    func addTapGuesturesForImagesAndLabels() 
        UITapGestureRecognizer.addNewTapGuestureRecognizer(for: postActionShareImageVIew, selectorName: #selector(self.shareImageTapped))
        UITapGestureRecognizer.addNewTapGuestureRecognizer(for: postActionLikeImageVIew, selectorName: #selector(self.likeImageTapped))
    

    @objc func shareImageTapped() 
        print("share")
    

    @objc func likeImageTapped() 
    

控制台错误提示：

由于未捕获的异常而终止应用程序 'NSInvalidArgumentException'，原因：'+[UITapGestureRecognizer likeImageTapped]: 无法识别的选择器发送到类 0x1b52e4c50'

【参考方案1】：

问题似乎在这里： let tap = UITapGestureRecognizer(target: self, action: selectorName)

目标不是self，是UICollectionViewCell的实例。

将您的代码更改为：

static func addNewTapGuestureRecognizer(for imageView: UIImageView, target: Any, selectorName: Selector) 
    let tap = UITapGestureRecognizer(target: target, action: selectorName)
    imageView.addGestureRecognizer(tap)
    imageView.isUserInteractionEnabled = true

【参考方案2】：

问题出在目标所以替换这个

 static func addNewTapGuestureRecognizer(for imageView: UIImageView, selectorName: Selector) 

与

static func addNewTapGuestureRecognizer(for imageView: UIImageView, selectorName: Selector , myTarget:UICollectionViewCell) 

     let tap = UITapGestureRecognizer(target: myTarget, action: selectorName)