Ios 通过AirDrop发送自定义文件类型

我正在构建一个Objective-C应用程序，它使用iOS中包含的空投功能。我试图发送的文件是一个.plist文件，出于某种原因，技术上被认为是一种自定义文件类型。当从我的Mac接收到一个.plist文件时，一切都很顺利，但是当我尝试发送时，空投立即失败，并且我能够在调试器中显示一个错误

它说：

AirDrop: Invalid URL (no scheme) /var/mobile/Containers/Data/Application/AB771F7E-AFDB-4CB4-8D60-E1B62BAB8A62/Documents/Chicken.plist

后来：

Sender kSFOperationEventErrorOccured { Error = "Error Domain=SFOperation Code=-4 \"The transfer failed because there were no valid files to send.\" 

最后，错误的NSLocalizedDescription说：

UserInfo={NSLocalizedDescription=The transfer failed because there were no valid files to send.}

我不确定它为什么找不到文件，因为我在整个应用程序中使用类似的代码从该目录检索文件，而且一切正常。以下是用户按下共享按钮时调用的iAction方法中的代码：

recipeName = [[NSUserDefaults standardUserDefaults]
                        stringForKey:@"recipeName"];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *appFolderPath = [paths objectAtIndex:0];
NSString *plistName = [recipeName stringByAppendingString:@".plist"]; //add ".plist" to the end of the recipe name
NSString *fileName = [appFolderPath stringByAppendingPathComponent:plistName]; //find plist


NSURL *url = [NSURL URLWithString:fileName];
UIActivityViewController *controller = [[UIActivityViewController alloc] initWithActivityItems:@[url] applicationActivities:nil];

// Exclude all activities except AirDrop.
NSArray *excludedActivities = @[UIActivityTypePostToTwitter, UIActivityTypePostToFacebook,
                                UIActivityTypePostToWeibo,
                                UIActivityTypeMessage, UIActivityTypeMail,
                                UIActivityTypePrint, UIActivityTypeCopyToPasteboard,
                                UIActivityTypeAssignToContact, UIActivityTypeSaveToCameraRoll,
                                UIActivityTypeAddToReadingList, UIActivityTypePostToFlickr,
                                UIActivityTypePostToVimeo, UIActivityTypePostToTencentWeibo];
controller.excludedActivityTypes = excludedActivities;

// Present the controller
[self presentViewController:controller animated:YES completion:nil];

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提前感谢

您需要一个文件URL。试着改变这个

NSURL *url = [NSURL URLWithString:fileName];

到

NSURL *url = [NSURL fileURLWithPath:fileName];