ios - 关于自定义全局UIButton的问题

Question

我自定义了一个分享按钮，放在UINavigationbar中作为右栏按钮项，我想点击这个按钮呈现一个UIActivityViewController，代码可以构建成功并运行，但是无法点击分享按钮，没有任何反应(甚至错误)，就像分享按钮被禁用一样。

演示图片:

谁能帮我解决这个问题吗？预先感谢您。

代码:

import UIKit

import Font_Awesome_Swift

class shareButton:UIButton{

var button:UIButton = UIButton()

init(button_frame: CGRect, connected: [UIButton]?){
    super.init(frame:CGRect(x: 0, y: 0, width: 20, height: 20))
    self.button.frame = button_frame
    self.button.setFAIcon(icon: FAType.FAShareAlt, iconSize: 22, forState: .normal)
    self.button.setFATitleColor(color: .darkGray)
    self.button.addTarget(self, action:#selector(self.buttonPressed), for: .touchUpInside)
}

required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

func construct() -> UIButton {
    return self.button
}

@objc func buttonPressed() {
    let url = NSURL.init(string: "http://www.probe-lab.com")
    let items:[Any] = [url!]
    let activityViewController = UIActivityViewController(activityItems: items, applicationActivities: nil)
    activityViewController.excludedActivityTypes = [.print,
                                                    .assignToContact,.saveToCameraRoll,.addToReadingList,.openInIBooks]
    let appDelegate = UIApplication.shared.delegate as! AppDelegate
    appDelegate.window?.rootViewController?.present(activityViewController, animated: true, completion: nil)
 }
}

在 View Controller 中我使用了这样的按钮:

override func viewDidLoad() {
    super.viewDidLoad()

    let btn = shareButton(button_frame: CGRect(x:0, y:0, width: 30, height:30), connected:nil ).construct()
    let item = UIBarButtonItem(customView: btn)
    self.navigationItem.rightBarButtonItem = item
}

Answer 1

首先，请确保类名大写。这是 Swift 的约定。现在，继续讨论解决方案:

您不需要子类化 UIButton 即可获得所需的结果。

只需添加“buttonPressed”代码作为 barbuttonitem 的操作即可。

尝试创建一个 UIButton 子类，在内部实例化另一个 UIButton 并将该按钮发送到 ViewController，然后将其转换为 UIBarButtonItem，这是一种非常复杂的方法。

您可以从此存储库下载我的解决方案: https://github.com/asabzposh/StackOverFlow-48554026.git

如果你想创建一个 UIButton 子类，那么这样做:

import UIKit

class ShareButton: UIButton {

    override init(frame: CGRect) {            
        super.init(frame: frame)
        // Set title, background color, etc.
        let imageView = UIImageView(frame: frame)
        let image = UIImage(named: "p.jpeg")
        imageView.image = image
        imageView.contentMode = .scaleAspectFill
        self.addSubview(imageView)
        self.addTarget(self, action: #selector(internalButtonPressed), for: .touchUpInside)
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

    @objc func internalButtonPressed() {
        let url = NSURL.init(string: "http://www.probe-lab.com")
        let items:[Any] = [url!]
        let activityViewController = UIActivityViewController(activityItems: items, applicationActivities: nil)
        activityViewController.excludedActivityTypes = [.print, .assignToContact,.saveToCameraRoll,.addToReadingList,.openInIBooks]
        let appDelegate = UIApplication.shared.delegate as! AppDelegate
    appDelegate.window?.rootViewController?.present(activityViewController, animated: true, completion: nil)
    }
}

然后在 ViewController 中使用它:

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

       // 1. Solution A
       // let item = UIBarButtonItem(title: "Share", style: .plain, target: self, action: #selector(buttonPressed))

      // 2. Solution B
        let button = ShareButton(frame: CGRect(x: 0, y: 0, width: 20, height: 20))
        let item = UIBarButtonItem()
        item.customView = button

     // 3. Finally Add barbutton item
        self.navigationItem.rightBarButtonItem = item
    }

    @objc func buttonPressed() {
        let url = NSURL.init(string: "http://www.probe-lab.com")
        let items:[Any] = [url!]
        let activityViewController = UIActivityViewController(activityItems: items, applicationActivities: nil)
        activityViewController.excludedActivityTypes = [.print, .assignToContact,.saveToCameraRoll,.addToReadingList,.openInIBooks]
        let appDelegate = UIApplication.shared.delegate as! AppDelegate
    appDelegate.window?.rootViewController?.present(activityViewController, animated: true, completion: nil)
    }
}