Question

我正在使用UIActivityViewController在我的应用中分享一些文字。我已经将UIActivityItemProvider子类化，以便我可以根据所选的共享应用程序处理文本。在我呈现视图控制器之前，我创建了一个可以附加到邮件消息的文本文件。（我将文件写入URL并将其添加到共享项目数组。）如果用户点击“邮件”图标，则文本文档文件将附加到邮件中，并且一切都在世界范围内。这是我使用的代码：

- (IBAction)shareBarButtonPressed:(UIBarButtonItem *)sender

NSString *docPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0];
NSString *resultsFile = [docPath stringByAppendingString:@"/results.txt"];

[self createResultFile];

NSURL *fileUrl = [NSURL fileURLWithPath:resultsFile];
NSData *fileData = [[NSData alloc]initWithContentsOfFile:resultsFile];

[fileData writeToURL:fileUrl atomically:YES];

NSString *testString = @"This is my string";

PRActivityProvider *activityProvider = [[PRActivityProvider alloc] initWithPlaceholderItem:[self fillResultFromView]];
NSArray *items = @[activityProvider, testString];

UIActivityViewController *activityViewController =
[[UIActivityViewController alloc] initWithActivityItems:items
                                  applicationActivities:nil];

NSString *subject = [NSString stringWithFormat:@"Results: %@",self.result.eventName];
[activityViewController setValue:subject forKey:@"subject"];

[activityViewController setExcludedActivityTypes:
    @[UIActivityTypeSaveToCameraRoll,
      UIActivityTypeAssignToContact,
      UIActivityTypePostToTencentWeibo,
      UIActivityTypeCopyToPasteboard]];

[self presentViewController:activityViewController animated:YES completion:nil];

[activityViewController setCompletionHandler:^(NSString *act, BOOL done)
 {
     NSString *ServiceMsg = nil;
     if ( [act isEqualToString:UIActivityTypeMail] )           ServiceMsg = @"Results sent!";
     if ( [act isEqualToString:UIActivityTypePostToTwitter] )  ServiceMsg = @"Results posted on Twitter!";
     if ( [act isEqualToString:UIActivityTypePostToFacebook] ) ServiceMsg = @"Results posted on FaceBook!";
     if ( [act isEqualToString:UIActivityTypeMessage] )        ServiceMsg = @"SMS sent!";
     if ( done )
     {
         UIAlertView *Alert = [[UIAlertView alloc] initWithTitle:ServiceMsg message:@"" delegate:nil cancelButtonTitle:@"ok" otherButtonTitles:nil];
         [Alert show];
     }
 }];

但是，我有两个问题：

首先，当用户点击SMS图标以在文本中发送NSString时，先前创建的文件也会附加（或嵌入）在消息文本中。有没有办法选择性地选择＆＃39;根据选择的共享服务附加文件？或者也许是一种在用户点击短信图标时删除文件的方法？我是否需要在活动提供程序子类中进行一些清理以清理文本消息？

其次，在真实设备上，SMS消息无法到达其目标。完成处理程序触发并显示SMS消息完成，但我从未收到它。不确定这里是否存在竞争条件 - 它实际上在我收到带有字符串的短信的情况下工作了一次。

这是activityController代码：

- (id) activityViewController:(UIActivityViewController *)activityViewController
      itemForActivityType:(NSString *)activityType

// the number of item to share
static UIActivityViewController *shareController;
static int itemNo;
if (shareController == activityViewController && itemNo < numberOfSharedItems - 1)
    itemNo++;
else {
    itemNo = 0;
    shareController = activityViewController;
}

PRResults *result = [[PRResults alloc]init];
result = self.placeholderItem;

// twitter
if ([activityType isEqualToString: UIActivityTypePostToTwitter]) {
    return [self makeTweetFromResult:result];
}

// SMS text message
else if ([activityType isEqualToString: UIActivityTypeMessage]) {
    return [self makeTweetFromResult:result];
}

// email
else if ([activityType isEqualToString: UIActivityTypeMail]) {
    return @"Open the attached results file in a notepad app to view.";
}

// Facebook
else if ([activityType isEqualToString:UIActivityTypePostToFacebook]) {
    return [self makeFacebookPostFromResult:result];
}

return nil;

使用UIActivityViewController

0 个答案: