ios - 在 iphone sdk 中使用 UIDocumentInteraction 在微信中共享文本

Question

我们如何在微信中与 UIDocumentInteraction 控制器或 UIActivityViewController 共享文本？我正在使用它但没有成功：

UIDocumentInteraction *docController = [UIDocumentInteractionController interactionControllerWithURL:fileURL]; self.docController.delegate = self;

docController.UTI = @"公共文本";

    NSString * msg = @"Hello WEChat";
    NSString * urlWhats = [NSString stringWithFormat:@"%@",msg];
    //controller.UTI = urlWhats;

    docController.annotation = [NSDictionary dictionaryWithObject:@"This is testing" forKey:@"Public Text"];