在 swift (iOS) 中实现文档 Select 器

Update for iOS 14:你不需要任何能力.只要用适当的类型创建一个UIDocumentPickerViewController，实现委托，你就完成了.

更多信息in this answer.代码如下:

import UIKit
import MobileCoreServices
import UniformTypeIdentifiers

func selectFiles() {
    let types = UTType.types(tag: "json", 
                             tagClass: UTTagClass.filenameExtension, 
                             conformingTo: nil)
    let documentPickerController = UIDocumentPickerViewController(
            forOpeningContentTypes: types)
    documentPickerController.delegate = self
    self.present(documentPickerController, animated: true, completion: nil)
}

从项目的功能中，启用iCloud和Key-Sharing.

在类中导入MobileCoreServices，然后在UIViewController中扩展以下三个类:

UIDocumentMenuDelegate,UIDocumentPickerDelegate,UINavigationControllerDelegate

实现以下功能:

public func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) {
    guard let myURL = urls.first else {
        return
    }
    print("import result : \(myURL)")
}
      

public func documentMenu(_ documentMenu:UIDocumentMenuViewController, didPickDocumentPicker documentPicker: UIDocumentPickerViewController) {
    documentPicker.delegate = self
    present(documentPicker, animated: true, completion: nil)
}


func documentPickerWasCancelled(_ controller: UIDocumentPickerViewController) {
    print("view was cancelled")
    dismiss(animated: true, completion: nil)
}

你怎么称呼这一切？向单击功能中添加以下代码:

func clickFunction(){

let importMenu = UIDocumentMenuViewController(documentTypes: [String(kUTTypePDF)], in: .import)
    importMenu.delegate = self
    importMenu.modalPresentationStyle = .formSheet       
    self.present(importMenu, animated: true, completion: nil)
}

点击你的按钮.将弹出以下菜单..

就Dropbox而言.点击任何一项.你将被重定向回你的应用程序，URL将被登录到你的终端.

根据需要操作文档类型.在我的应用程序中，用户只允许使用Pdf.所以，随你的便.

kUTTypePDF

如果你想定制你自己的菜单栏.添加以下代码并在处理程序中自定义自己的函数

importMenu.addOption(withTitle: "Create New Document", image: nil, order: .first, handler: { print("New Doc Requested") })

享受吧.