選擇文件的類型設(shè)置參考：設(shè)置選擇文件支持類型。這里設(shè)置用顯示所有@"public.item"

<UIDocumentPickerDelegate>

UIDocumentPickerViewController *documentPickerViewController = [[UIDocumentPickerViewController alloc] initWithDocumentTypes:@[@"public.item"] inMode:UIDocumentPickerModeOpen];

? ? ? ? ? ? documentPickerViewController.delegate=self;

? ? [selfpresentViewController:documentPickerViewControlleranimated:YEScompletion:nil];

- (void)documentPicker:(UIDocumentPickerViewController *)controller didPickDocumentAtURL:(NSURL *)url {}