UIActivityViewController中缺少Airdrop选项

Question

由于某些原因，当我从我的应用程序使用ActivityViewController时，我没有选择使用Airdrop进行共享。如果我用它从Chrome中，我得到的选项：

这是我使用的代码：

NSMutableArray * items = [NSMutableArray new]; 
[items addObject:@"text for share"]; 
[items addObject:[UIImage imageNamed:@"image"]]; 
NSArray *activityItems = [NSArray arrayWithArray:items]; 


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


[self presentViewController:activityViewController animated:YES completion:^{ 
    ..... 
}]; 

但我只得到这样的：

如何添加Airdrop选项？

Answer 1

为了能够通过AirDrop发送某些内容，该项目需要是URL。我找不到官方文档，但在这个Apple AirDrop Example它指出：

URLs can be used as a simple way to transfer information between devices. Apps can easily parse a received URL to determine what action to take. After an app registers a URL scheme (including custom schemes), the system will know to launch that app when a URL of that type is received.