Swift - UIPasteboard剪贴板的使用详解（复制、粘贴文字和图片）

UITextField、UITextView组件系统原生就支持文字的复制，但有时我们需要让其他的一些组件也能实现复制功能，比如点击复制UILabel上的文字、UIImageView中的图片、UITableView里单元格的内容、或者点击按钮把文字或图片自动复制到粘贴板中等等。

UIPasteboard.general.string = "欢迎访问 hangge.com"

2，复制字符串数组

UIPasteboard.general.strings = ["hellow", "hangge.com"]

3，复制图片

let image = UIImage(named: "logo.png")
UIPasteboard.general.image = image

4，复制二进制数据（Data）

let path = Bundle.main.path(forResource: "logo", ofType: "png")!
let url = URL(fileURLWithPath: path)
let fileData = try! Data(contentsOf: url)
UIPasteboard.general.setData(fileData, forPasteboardType: "public.png")

注：从剪贴板获取二进制数据（Data）

let myData = UIPasteboard.general.data(forPasteboardType: "public.png")

import UIKit

class UICopyLabel: UILabel {
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        sharedInit()
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        sharedInit()
    }
    
    func sharedInit() {
        isUserInteractionEnabled = true
        
        addGestureRecognizer(UILongPressGestureRecognizer(target: self,
                                                          action: #selector(showMenu(_:))))
    }
    
    func showMenu(_ sender: UILongPressGestureRecognizer) {
        becomeFirstResponder()
        let menu = UIMenuController.shared
        if !menu.isMenuVisible {
            menu.setTargetRect(bounds, in: self)
            menu.setMenuVisible(true, animated: true)
        }
    }
    
    //复制
    override func copy(_ sender: Any?) {
        let board = UIPasteboard.general
        board.string = text
        let menu = UIMenuController.shared
        menu.setMenuVisible(false, animated: true)
    }
    
    override var canBecomeFirstResponder: Bool {
        return true
    }
    
    override func canPerformAction(_ action: Selector, withSender sender: Any?)
        -> Bool {
            if action == #selector(UIResponderStandardEditActions.copy(_:)) {
                return true
            }
            return false
    }
}

在这个文本标签上长按后便可以复制其内容： 我们自定义一个图片控件类 UICPImageView（继承UIImageView），内部同样添加Touch事件响应。该控件不仅支持复制，还支持粘贴。

import UIKit

class UICPImageView: UIImageView {
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        sharedInit()
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        sharedInit()
    }
    
    func sharedInit() {
        isUserInteractionEnabled = true
        addGestureRecognizer(UILongPressGestureRecognizer(target: self,
                                                          action: #selector(showMenu(_:))))
    }
    
    func showMenu(_ sender: UILongPressGestureRecognizer) {
        becomeFirstResponder()
        let menu = UIMenuController.shared
        if !menu.isMenuVisible {
            menu.setTargetRect(bounds, in: self)
            menu.setMenuVisible(true, animated: true)
        }
    }
    
    //复制
    override func copy(_ sender: Any?) {
        let board = UIPasteboard.general
        board.image = self.image
        let menu = UIMenuController.shared
        menu.setMenuVisible(false, animated: true)
    }
    
    //粘贴
    override func paste(_ sender: Any?)  {
        let board = UIPasteboard.general
        self.image = board.image
        let menu = UIMenuController.shared
        menu.setMenuVisible(false, animated: true)
    }
    
    override var canBecomeFirstResponder: Bool {
        return true
    }
    
    override func canPerformAction(_ action: Selector, withSender sender: Any?)
        -> Bool {
            if action == #selector(UIResponderStandardEditActions.copy(_:)) {
                return true
            }else if action == #selector(UIResponderStandardEditActions.paste(_:)) {
                return true
            }
            return false
    }
}

下面我们在界面上添加两个 UICPImageView，我们可以把左边控件里的图片复制到右边控件中来，效果图如下： 3，让表格（UITableView）支持复制功能

import UIKit

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
    
    var tableView:UITableView?
    var tableData = ["条目1", "条目2", "条目3", "条目4", "条目5", "条目6", "条目7"]
    
    override func loadView() {
        super.loadView()
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        //创建表视图
        self.tableView = UITableView(frame: self.view.frame, style:.plain)
        self.tableView!.delegate = self
        self.tableView!.dataSource = self
        //创建一个重用的单元格
        self.tableView!.register(UITableViewCell.self,
                                      forCellReuseIdentifier: "SwiftCell")
        self.view.addSubview(self.tableView!)
    }
    
    func tableView(_ tableView: UITableView, performAction action: Selector,
                   forRowAt indexPath: IndexPath, withSender sender: Any?) {
        let board = UIPasteboard.general
        board.string = tableData[indexPath.row]
    }
    
    func tableView(_ tableView: UITableView, canPerformAction action: Selector,
                   forRowAt indexPath: IndexPath, withSender sender: Any?) -> Bool {
        if action == #selector(UIResponderStandardEditActions.copy(_:)) {
            return true
        }
        return false
    }
    
    func tableView(_ tableView: UITableView,
                   shouldShowMenuForRowAt indexPath: IndexPath) -> Bool {
        return true
    }
    
    //在本例中，只有一个分区
    func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }
    
    //返回表格行数（也就是返回控件数）
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return tableData.count
    }
    
    //创建各单元显示内容(创建参数indexPath指定的单元）
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath)
        -> UITableViewCell {
        //为了提供表格显示性能，已创建完成的单元需重复使用
        let identify:String = "SwiftCell"
        //同一形式的单元格重复使用，在声明时已注册
            let cell = tableView.dequeueReusableCell(withIdentifier: identify,
                                                     for: indexPath) as UITableViewCell
        cell.accessoryType = UITableViewCellAccessoryType.disclosureIndicator
        cell.textLabel?.text = tableData[indexPath.row]
        return cell
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}

长按某个单元格即可复制这个单元格内容：