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我有一些代码显示 UIAcvityViewController 用于从我的应用程序导出自定义对象，格式为 JSON。此代码在以前的 iOS 版本中运行良好，但现在在 iOS 11 中失败。问题是当 Activity View Controller 显示时，它根本不显示 Airdrop 面板或可用的接收设备。该文档是一个 NSDictionary，它被编码并写入 NSData 对象，然后写入磁盘并由 NSURL 引用。正如我所说，这段代码运行良好，并且在以前的 iOS 版本中仍然运行良好。我还有另一个地方使用 UIActivityViewController 导出图像文件，Airdrop 在 iOS 11 中继续正常工作。我假设这个问题与我在 ActivityProvider 的 url 键中引用的 URL 导出和引用的文件的格式有关，但我已经尝试了所有有意义的输出和编码这个对象的方法。这是我正在使用的代码：

NSString *textToShare = @"I am sharing this record with you!";
NSURL* url = [self.record exportNoteToURL];

NSMutableArray* activityProviders = [[NSMutableArray alloc]initWithCapacity:0];
NoteRecordActivityProvider *provider = [[NoteRecordActivityProvider alloc] initWithPlaceholderItem:@{@"body":textToShare, @"url":url}];
[activityProviders addObject:provider];

//Initialize the ActivityViewController
UIActivityViewController *activityController = [[UIActivityViewController alloc] initWithActivityItems:activityProviders applicationActivities:applicationActivities];

NSArray *excludeActivities = @[UIActivityTypePostToFacebook,
                               UIActivityTypePostToTwitter,
                               UIActivityTypePostToWeibo,
                               //UIActivityTypeMessage,
                               //UIActivityTypeMail,
                              //UIActivityTypePrint,
                               UIActivityTypeCopyToPasteboard,
                               UIActivityTypeAssignToContact,
                               UIActivityTypeSaveToCameraRoll,
                               UIActivityTypeAddToReadingList,
                               UIActivityTypePostToFlickr,
                               UIActivityTypePostToVimeo,
                               UIActivityTypePostToTencentWeibo,
                               //UIActivityTypeAirDrop,
                               UIActivityTypeOpenInIBooks];

activityController.excludedActivityTypes = excludeActivities;
[activityController setValue:[NSString stringWithFormat:@"Record:  %@", self.record.title] forKey:@"subject"];
activityController.popoverPresentationController.barButtonItem = (UIBarButtonItem*)sender;
activityController.completionWithItemsHandler = ^(NSString *activityType, BOOL completed, NSArray *returnedItems, NSError *activityError) {
    if (completed)
    {
        NSLog(@"The Activity: %@ was completed", activityType);
    }
    else
    {
        NSLog(@"The Activity: %@ was NOT completed", activityType);
    }
    [FileSystemProvider clearExportsDirectory];
};
[self presentViewController:activityController animated:YES completion:nil];

以下是将字典导出到 URL 的代码，它似乎工作正常。

#pragma mark Document Export
-(NSURL*) exportNoteToURL
{
    NSMutableDictionary* dict =[[NSMutableDictionary alloc]initWithCapacity:0];

    // 1 Create Dictionary
    NSDictionary* noteDict = [self getSettingsDictionary];
    [dict setValue:noteDict forKey:@"Note"];

    // 2 Get File Name and create file path
    NSString* fullFilePath = [[FileSystemProvider documentPath]stringByAppendingPathComponent:@"Exports"];
    NSLog(@"Export Path:  %@", fullFilePath);
    [MiscUtilities createDirectory:fullFilePath];

    NSString* fileName = @"ExportedNoteRecord.lgz";
    fileName = self.title;
    fileName = [fileName stringByReplacingOccurrencesOfString:@" " withString:@""];
    fileName = [MiscUtilities SanitizeFileNameString:fileName];
    fileName = [NSString stringWithFormat:@"%@%@", fileName, @".lgz"];

    fullFilePath = [fullFilePath stringByAppendingPathComponent:fileName];

    // 3 Write dictionary to FileSystem
    NSURL* url = [[NSURL alloc]initFileURLWithPath:fullFilePath];
    BOOL res = [dict writeToURL:url error:&error];

    if (res)
    {
        return url;
    }
    else
    {
        return nil;
    }
}
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1 回答 1

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问题是您activityViewControllerPlaceholderItem返回字典。您在此处返回的类型用于指示您要出售的对象类型。Airdrop 不想收到神秘的字典，所以它没有响应。如果出售的是一个文件 URL，那么您应该返回一个 URL。

于 2017-11-06T18:27:41.750 回答