ios - touchUpInside 事件未触发

Question

我是 IOS 编程的新手，但奇怪的是，相同的代码在不同的类中工作，所以我不知道为什么它不起作用它在 Swift 3 中

class BottomMenu : NSObject{

    //Container view
    var bottomView: UIView!    

    //Button
    var buttonContents : UIButton!


    init(bottomView : UIView) {
        super.init()
        self.bottomView = bottomView        

        buttonContents = UIButton(frame: getFrame(index: 0))    
        buttonContents.backgroundColor = UIColor.blue //To see where to click on the screen
        bottomView.addSubview(buttonContents)

        buttonContents.addTarget(self, action: #selector(onClick), for: .touchUpInside)
    }

    func getFrame(index : CGFloat!) -> CGRect{
        let screenW = UIScreen.main.bounds.width
        return CGRect(x: (screenW/3) * index,
                           y: 0,
                           width: screenW/3,
                           height: self.bottomView.frame.size.height)
    }    
    func onClick(sender: UIButton!){
        NSLog("click")
    }

}

这是这个类的实现:

let bottomMenu = BottomMenu(bottomView: bottomNavBarContainer)

因此，“点击”日志永远不会显示

Answer 1

您的代码在 Playground 中运行良好。错误必须在类的使用中。父 View 已禁用 userInteraction 等。

import UIKit
import Foundation
import PlaygroundSupport

class BottomMenu : NSObject{

//Container view
var bottomView: UIView!

//Button
var buttonContents : UIButton!


init(bottomView : UIView) {
    super.init()
    self.bottomView = bottomView

    buttonContents = UIButton(frame: getFrame(index: 0))
    buttonContents.backgroundColor = UIColor.blue //To see where to click on the screen
    bottomView.addSubview(buttonContents)

    buttonContents.addTarget(self, action: #selector(onClick), for: .touchUpInside)
}

func getFrame(index : CGFloat!) -> CGRect{
    let screenW = UIScreen.main.bounds.width
    return CGRect(x: (screenW/3) * index,
                  y: 0,
                  width: screenW/3,
                  height: self.bottomView.frame.size.height)
}
func onClick(sender: UIButton!){
    NSLog("click")
}

}

var container = UIView(frame: CGRect(x: 0.0, y: 0.0, width: 100.0, height: 100.0))
let view = UIView(frame: CGRect(x: 0.0, y: 0.0, width: 100.0, height: 100.0))
container.addSubview(view)
let buttonContents = BottomMenu(bottomView: view)

PlaygroundPage.current.liveView = container