无法识别的选择器发送到实例 Swift 3 [英] Unrecognized selector sent to instance Swift 3

问题描述

我想用 selector 实现 TapGestureRecognizer，下面是我将 tapGestureRecognizer 添加到我的 imageView

I want to implement TapGestureRecognizer with the selector, below is the code where I added tapGestureRecognizer to my imageView

let tapFirstGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(assignImage(_:)))
firstImageView.isUserInteractionEnabled = true
firstImageView.tag = 1
firstImageView.addGestureRecognizer(tapFirstGestureRecognizer)

这里是操作方法

func assignImage(_ sender: UIImageView){
    imagePicker.allowsEditing = false
    imagePicker.sourceType = .photoLibrary
    imageViewTag = sender.tag

    present(imagePicker, animated: true, completion: nil)
}

编译器一直说

[UITapGestureRecognizer tag]:无法识别的选择器发送到实例 0x6080001a7700'

[UITapGestureRecognizer tag]: unrecognized selector sent to instance 0x6080001a7700'

推荐答案

问题在于您的方法声明以及将 tag 分配给 UIGestureRecognizer 的对象.像这样更改您的方法声明.

The problem is with your method declaration and with assigning tag to the object of UIGestureRecognizer. Change your method declaration like this.

func assignImage(_ sender: UITapGestureRecognizer)

或者

func assignImage(_ sender: UIGestureRecognizer)

使用 UITapGestureRecognizer 访问 imageView 对象.

To access imageView object with UITapGestureRecognizer.

func assignImage(_ sender: UITapGestureRecognizer) {
    if let imageView = sender.view as? UIImageView {

    }
}

注意:你需要用你的imageView设置tag而不是你UITapGestureRecognizer

Note: You need to set tag with you imageView not with you UITapGestureRecognizer

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