在iOS13上强制QLPreviewController进入编辑模式

import UIKit
import QuickLook

class PreviewController: QLPreviewController, QLPreviewControllerDataSource, QLPreviewControllerDelegate {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        dataSource = self
        delegate = self
    }
    
    // MARK: - QLPreviewControllerDataSource
    
    override func numberOfPreviewItems(in controller: QLPreviewController) -> Int {
        return 1
    }
    
    override func previewItem(at index: Int) -> QLPreviewItem {
        // 返回要预览的文件路径或URL
        let fileURL = URL(fileURLWithPath: "path_to_file")
        return fileURL as QLPreviewItem
    }
    
    // MARK: - QLPreviewControllerDelegate
    
    func previewController(_ controller: QLPreviewController, editingModeFor previewItem: QLPreviewItem) -> QLPreviewItemEditingMode {
        // 返回编辑模式状态
        return QLPreviewItemEditingMode.enabled
    }
    
    func previewController(_ controller: QLPreviewController, didChangeEditing editingMode: QLPreviewItemEditingMode, for previewItem: QLPreviewItem) {
        // 处理编辑模式变化
        if editingMode == QLPreviewItemEditingMode.enabled {
            // 进入编辑模式
            setEditing(true, animated: true)
        } else {
            // 退出编辑模式
            setEditing(false, animated: true)
        }
    }
}