iOS：在屏幕上镜像内容

iOS上的镜像功能允许用户将屏幕上的内容以实时的方式进行显示和分享。无论是进行演示、教学、还是与他人分享内容，镜像功能都能提供便利。在本文中，我们将详细介绍如何在iOS设备上使用镜像功能，并提供一个案例代码来帮助读者更好地理解。

swift
import UIKit
import ReplayKit
class MirrorViewController: UIViewController, RPPreviewViewControllerDelegate {
    
    let recorder = RPScreenRecorder.shared()
    var isRecording = false
    
    @IBAction func startRecording(_ sender: UIButton) {
        if !isRecording {
            recorder.startRecording { [unowned self] (error) in
                if let error = error {
                    print("启动录制失败：\(error.localizedDescription)")
                } else {
                    self.isRecording = true
                    sender.setTitle("停止录制", for: .normal)
                }
            }
        } else {
            recorder.stopRecording { [unowned self] (previewViewController, error) in
                if let previewViewController = previewViewController {
                    previewViewController.previewControllerDelegate = self
                    self.present(previewViewController, animated: true, completion: nil)
                }
                self.isRecording = false
                sender.setTitle("开始录制", for: .normal)
            }
        }
    }
    
    func previewControllerDidFinish(_ previewController: RPPreviewViewController) {
        dismiss(animated: true, completion: nil)
    }
}