My app is getting crashed on UIDocumentPickerViewC

问题:

I am working on file sharing on my iOS App, I am new to UIDocumentPickerViewController. I do not know why my app is crashing.

UIDocumentPickerViewController *documentPicker = [[UIDocumentPickerViewController alloc] initWithDocumentTypes:@[@"public.image"] inMode:UIDocumentPickerModeImport];
documentPicker.delegate = self;
documentPicker.modalPresentationStyle = UIModalPresentationFormSheet;
[self presentViewController:documentPicker animated:YES completion:nil];

App is crashing on the highlighted lines.

Has anyone done this previously? I want to do the same like the attachment below

回答1:

See Prerequisite section on Apple Documentation:

Before your app can use the document picker, you must turn on the iCloud Documents capabilities in Xcode

Let me know if this solve your problem!

回答2:

Even with all entitlements set up, this still happens every now and then, when running on a device (not simulator).
The best solution I've found so far is:

1. Stop the app from Xcode.
2. Launch the app from the device (tap the app icon on the home screen...)
3. Navigate in your app, in order to open the UIDocumentPickerViewController.
4. Once open, you can launch the app again in Xcode and UIDocumentPickerViewController will init as intended.

From my experience, it will work until you install a TestFlight build. Sometimes you'll need to do this again after restarting Xcode.
This certainly looks like a bug with installing entitlements on the device.

(Xcode 7.2, iOS 9.2)

回答3:

swift 3.0 you can select all document.

let documentPicker = UIDocumentPickerViewController(documentTypes: ["com.apple.iwork.pages.pages", "com.apple.iwork.numbers.numbers", "com.apple.iwork.keynote.key","public.image", "com.apple.application", "public.item","public.data", "public.content", "public.audiovisual-content", "public.movie", "public.audiovisual-content", "public.video", "public.audio", "public.text", "public.data", "public.zip-archive", "com.pkware.zip-archive", "public.composite-content", "public.text"], in: .import)

    documentPicker.delegate = self
    present(documentPicker, animated: true, completion: nil)

回答4:

UIDocumentPickerViewController *documentPicker = [[UIDocumentPickerViewController alloc] initWithDocumentTypes:@[@"com.apple.iwork.pages.pages", @"com.apple.iwork.numbers.numbers", @"com.apple.iwork.keynote.key"] inMode:UIDocumentPickerModeImport];