iOS 调用文件、iCloud云盘。获取本地文件。

选择文件的类型设置参考：设置选择文件支持类型。这里设置用显示所有@"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 {}