UIActivityViewController中缺少Airdrop选项

Question

由于某种原因，当我从我的应用程序使用ActivityViewController时，我没有得到使用Airdrop共享的选项。如果我在Chrome中使用它，我会选择：

这是我正在使用的代码：

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:^{
  .....
}];

但我只能得到这个：

如何添加Airdrop选项？

Answer 1

为了能够通过AirDrop发送内容，该项目需要是一个URL。我找不到官方文档，但是在Apple AirDrop Example中它说明了：

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.