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[英]How do I read a pdf file in my iCloud Drive Desktop folder from within an iOS Swift app?
[英]How to access files in iCloud Drive from within my iOS app?
有沒有辦法從 iCloud Drive 中選擇文件,類似於UIImagePickerController()
?
您可以通過以下方式呈現控制器:
import MobileCoreServices
let documentPickerController = UIDocumentPickerViewController(documentTypes: [String(kUTTypePDF), String(kUTTypeImage), String(kUTTypeMovie), String(kUTTypeVideo), String(kUTTypePlainText), String(kUTTypeMP3)], inMode: .Import)
documentPickerController.delegate = self
presentViewController(documentPickerController, animated: true, completion: nil)
在您的委托中實現該方法:
func documentPicker(controller: UIDocumentPickerViewController, didPickDocumentAtURL url: NSURL)
請注意,您無需設置 iCloud 授權即可使用UIDocumentPickerViewController
。 Apple在此處提供了演示如何使用此控制器的示例代碼
當用戶選擇應用程序沙箱之外的目的地時,文檔選擇器會調用委托的 documentPicker:didPickDocumentAtURL: 方法。 系統將您的文檔副本保存到指定的目的地。 文檔選擇器提供副本的 URL 以指示成功; 但是,您的應用程序無權訪問此 URL 引用的文件。 關聯
這段代碼對我有用:
func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) {
let url = urls[0]
let isSecuredURL = url.startAccessingSecurityScopedResource() == true
let coordinator = NSFileCoordinator()
var error: NSError? = nil
coordinator.coordinate(readingItemAt: url, options: [], error: &error) { (url) -> Void in
_ = urls.compactMap { (url: URL) -> URL? in
// Create file URL to temporary folder
var tempURL = URL(fileURLWithPath: NSTemporaryDirectory())
// Apend filename (name+extension) to URL
tempURL.appendPathComponent(url.lastPathComponent)
do {
// If file with same name exists remove it (replace file with new one)
if FileManager.default.fileExists(atPath: tempURL.path) {
try FileManager.default.removeItem(atPath: tempURL.path)
}
// Move file from app_id-Inbox to tmp/filename
try FileManager.default.moveItem(atPath: url.path, toPath: tempURL.path)
YourFunction(tempURL)
return tempURL
} catch {
print(error.localizedDescription)
return nil
}
}
}
if (isSecuredURL) {
url.stopAccessingSecurityScopedResource()
}
navigationController?.dismiss(animated: true, completion: nil)
}
斯威夫特 4.X
您需要在 XCode 功能中啟用iCloud
權利。 此外,您必須在 Apple 的開發者帳戶中的應用程序包中打開iCloud
。 完成此操作后,您可以通過以下方式呈現文檔選擇器控制器:
使用UIDocumentPickerDelegate
方法
extension YourViewController : UIDocumentMenuDelegate, UIDocumentPickerDelegate,UINavigationControllerDelegate {
func documentMenu(_ documentMenu: UIDocumentMenuViewController, didPickDocumentPicker documentPicker: UIDocumentPickerViewController) {
documentPicker.delegate = self
self.present(documentPicker, animated: true, completion: nil)
}
func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentAt url: URL) {
print("url = \(url)")
}
func documentPickerWasCancelled(_ controller: UIDocumentPickerViewController) {
dismiss(animated: true, completion: nil)
}
}
為按鈕操作添加以下代碼
@IBAction func didPressAttachment(_ sender: UIButton) {
let importMenu = UIDocumentMenuViewController(documentTypes: [String(kUTTypePDF)], in: .import)
importMenu.delegate = self
importMenu.modalPresentationStyle = .formSheet
if let popoverPresentationController = importMenu.popoverPresentationController {
popoverPresentationController.sourceView = sender
// popoverPresentationController.sourceRect = sender.bounds
}
self.present(importMenu, animated: true, completion: nil)
}
這對我來說很好用。 希望對你也有幫助。
快樂編碼:)
這在iOS 14 中再次改變了!!
JSON 的工作示例:
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)
}
斯威夫特 5,iOS 13
Jhonattan 和 Ashu 的答案對於核心功能來說絕對是正確的,多文檔選擇、錯誤結果和不推薦使用的文檔選擇器 API 存在許多問題。
下面的代碼顯示了一個常見用例的現代自始至終版本:選擇一個外部 iCloud 文檔以導入應用程序並對其進行處理。
請注意,您必須將應用程序的功能設置為使用 iCloud 文檔,並在應用程序的 .plist 中設置一個無處不在的容器...參見示例: Swift write/save/move a document file to iCloud drive
class ViewController: UIViewController {
@IBAction func askForDocument(_ sender: Any) {
if FileManager.default.url(forUbiquityContainerIdentifier: nil) != nil {
let iOSPickerUI = UIDocumentPickerViewController(documentTypes: ["public.text"], in: .import)
iOSPickerUI.delegate = self
iOSPickerUI.modalPresentationStyle = .formSheet
if let popoverPresentationController = iOSPickerUI.popoverPresentationController {
popoverPresentationController.sourceView = sender as? UIView
}
self.present(iOSPickerUI, animated: true, completion: nil)
}
}
func processImportedFileAt(fileURL: URL) {
// ...
}
}
extension ViewController: UIDocumentPickerDelegate, UINavigationControllerDelegate {
func documentPickerWasCancelled(_ controller: UIDocumentPickerViewController) {
dismiss(animated: true, completion: nil)
}
func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) {
if controller.allowsMultipleSelection {
print("WARNING: controller allows multiple file selection, but coordinate-read code here assumes only one file chosen")
// If this is intentional, you need to modify the code below to do coordinator.coordinate
// on MULTIPLE items, not just the first one
if urls.count > 0 { print("Ignoring all but the first chosen file") }
}
let firstFileURL = urls[0]
let isSecuredURL = (firstFileURL.startAccessingSecurityScopedResource() == true)
print("UIDocumentPickerViewController gave url = \(firstFileURL)")
// Status monitoring for the coordinate block's outcome
var blockSuccess = false
var outputFileURL: URL? = nil
// Execute (synchronously, inline) a block of code that will copy the chosen file
// using iOS-coordinated read to cooperate on access to a file we do not own:
let coordinator = NSFileCoordinator()
var error: NSError? = nil
coordinator.coordinate(readingItemAt: firstFileURL, options: [], error: &error) { (externalFileURL) -> Void in
// WARNING: use 'externalFileURL in this block, NOT 'firstFileURL' even though they are usually the same.
// They can be different depending on coordinator .options [] specified!
// Create file URL to temp copy of file we will create:
var tempURL = URL(fileURLWithPath: NSTemporaryDirectory())
tempURL.appendPathComponent(externalFileURL.lastPathComponent)
print("Will attempt to copy file to tempURL = \(tempURL)")
// Attempt copy
do {
// If file with same name exists remove it (replace file with new one)
if FileManager.default.fileExists(atPath: tempURL.path) {
print("Deleting existing file at: \(tempURL.path) ")
try FileManager.default.removeItem(atPath: tempURL.path)
}
// Move file from app_id-Inbox to tmp/filename
print("Attempting move file to: \(tempURL.path) ")
try FileManager.default.moveItem(atPath: externalFileURL.path, toPath: tempURL.path)
blockSuccess = true
outputFileURL = tempURL
}
catch {
print("File operation error: " + error.localizedDescription)
blockSuccess = false
}
}
navigationController?.dismiss(animated: true, completion: nil)
if error != nil {
print("NSFileCoordinator() generated error while preparing, and block was never executed")
return
}
if !blockSuccess {
print("Block executed but an error was encountered while performing file operations")
return
}
print("Output URL : \(String(describing: outputFileURL))")
if (isSecuredURL) {
firstFileURL.stopAccessingSecurityScopedResource()
}
if let out = outputFileURL {
processImportedFileAt(fileURL: out)
}
}
}
iCloudUrl.startAccessingSecurityScopedResource() // 此時為我返回 true,
但是下面的代碼給出了錯誤:
試試 FileManager.default.createDirectory(atPath: iCloudUrl, withIntermediateDirectories: true, attributes: nil)
“您無法保存文件“xyz”,因為該卷是只讀的。”
這實際上有效:
嘗試 FileManager.default.createDirectory(at: iCloudUrl, withIntermediateDirectories: true, attributes: nil)
這是有道理的,因為 URL 可能帶有它的安全訪問權限,但是這個小小的疏忽讓我難住了半天……
對於我的 swiftUI 用戶:這很容易。
struct HomeView: View {
@State private var showActionSheet = false
var body: some View {
ButtonComponentView(title: "Press", handler: {
showActionSheet = true
})
.fileImporter(isPresented: $showActionSheet, allowedContentTypes: [.data]) { (res) in
print("!!!\(res)")
}
}
}
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