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• ViewController.swift中的代码

import UIKit
// 结构体
struct Book {
    var title: String?
    var tiem : String?
    var content : String?
}

//class BooK : NSObject {
//    
//}

class ViewController: UIViewController,SecViewControllerDelegate {
   
    var arr : [Book]  = [Book]()
    
    override func viewDidLoad() {
        super.viewDidLoad()
       
        for item in 0...4 {
            var book = Book()
            book.title = "\(item)"
            book.tiem = "事件\(item)"
            book.content = "内容:\(item)"
            arr.append(book)
        }
        
        let items = ["1","2","3","4","5"]
        let seg = UISegmentedControl(items: items)
        seg.frame = CGRect(x: 100, y: 100, width: 200, height: 40)
        seg.addTarget(self, action: #selector(segAction(seg: )), for: .valueChanged)
        seg.tag = 10000
        self.view.addSubview(seg)
        
    }

    func sendMsg(index: Int) {
       // 获取当前第几个item
        let seg = self.view.viewWithTag(10000) as! UISegmentedControl
        
        seg.setTitle("已阅", forSegmentAt: index)
      
    }
    
    func segAction(seg: UISegmentedControl) {
        let seconde = SecViewController()
        
        //取出当前点击第几个按钮， 我们就取出来第几本书
        let book = arr[seg.selectedSegmentIndex]
        seconde.index = seg.selectedSegmentIndex
        seconde.book = book
        seconde.delegate = self
        self.navigationController?.pushViewController(seconde, animated: true)
    }

}

• SecViewController.swift中的代码

import UIKit

protocol SecViewControllerDelegate {
    func sendMsg(index: Int)
}

class SecViewController: UIViewController {
    
    var book : Book? = nil
    var delegate :SecViewControllerDelegate! = nil
    var index : Int!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.view.backgroundColor = UIColor.white
      
        // label
        for inde in 0...2 {
            let label = UILabel(frame: CGRect(x: 30, y: 30 * (inde + 2) , width: 100, height: 40))
            self.view.addSubview(label)
            // 完成复制
                if inde == 0 {
                label.text = book?.title
                } else if inde == 1{
               label.text = book?.tiem
                } else if inde == 2 {
                label.text = book?.content
            }
        }
        
        let btn = UIButton(type: .system)
        btn.frame = CGRect(x: 100, y: 100, width: 100, height: 40)
        self.view.addSubview(btn)
        btn.setTitle("阅读", for: .normal)
        btn.addTarget(self, action: #selector(btnAction), for: .touchUpInside)
        
    }
    
    func btnAction() {
        self.delegate.sendMsg(index:self.index)
    }
}