是否可以使用UIActivityViewController为不同的社交媒体包含不同的内容？

Question

我正在使用ios 7的MobileCoreServices将应用内容发布到社交媒体上..这是我的代码..

NSArray *activityItems;

NSString *title =  _titleLabel.text;

if (_imageLabel.image != nil) {
    activityItems = @[title, _imageLabel.image];
} else {
    activityItems = @[title];
}

UIActivityViewController *activityController =
[[UIActivityViewController alloc]
 initWithActivityItems:activityItems
 applicationActivities:nil];

[self presentViewController:activityController

    animated:YES completion:nil];

现在它发送普通文本.我希望为Facebook和Twitter发布不同的标题.可能吗？

Answer 1

1. 您需要子类化UIActivityItemProvider

   @interface APCustomActivityProvider : UIActivityItemProvider <UIActivityItemSource>
   @end
   

2. 将以下内容添加到您的实现文件中

   @implementation APCustomActivityProvider
   - (id) activityViewController:(UIActivityViewController *)activityViewController
     itemForActivityType:(NSString *)activityType
   {
     if ( [activityType isEqualToString:UIActivityTypePostToTwitter] ){
       NSString *title = @"Twitter title";
       return title;
     }
     if ( [activityType isEqualToString:UIActivityTypePostToFacebook] ) {
       NSString *title = @"Facebook title";
       return title;
     }
     return nil;
   }
   
   - (id) activityViewControllerPlaceholderItem:(UIActivityViewController*)activityViewController { return @""; }
   @end
   

3. 要使用自定义ActivityProvider,请转到您演示UIActivityViewController的位置

   NSArray *activityItems;
   APCustomActivityProvider *activityProvider = [[APCustomActivityProvider alloc] init];
   if (_imageLabel.image != nil) {
       activityItems = @[activityProvider, _imageLabel.image];
   } else {
       activityItems = @[activityProvider];
   }
   
   
   UIActivityViewController *activityController = 
   [[UIActivityViewController alloc] initWithActivityItems:activityItems   
                                     applicationActivities:nil];
   
   [self presentViewController:activityController
                      animated:YES completion:nil];