AirDrop 是 iOS7 中新增的一个近距离分享功能，两个相邻的 iOS 设备可以通过 AirDrop 实现传递图片、文件等功能，有了 AirDrop 基本上可抛弃类似 Dropbox 的 ShareLink 和 PublicFolder 功能。
iOS7 的 SDK 中已经在 UIActivityViewController 中内置了 AirDrop 功能，使用时与分享到 twitter 和 facebook 的方式基本一致，只需要将需要传递的文件 URL 设置给 UIActivityViewController 对象的 ActivityItems 对象即可，区别在于：如果传递文件，那么 URL 应该是 “file://” 开头，而不是常见的 “http://” 开头 参考代码:
NSString *filePath = "Documents/aaa.png"
NSURL *url = [NSURL fileURLWithPath];
NSArray *items = [NSArray ArrayWithObjects,nil];
UIActivityViewController *activityViewController =
[[UIActivityViewController alloc] initWithActivityItems applicationActivities];
[self presentViewController animated completion];
如果只想使用 AirDrop 而不使用其他分享功能，只需要设置 UIActivityViewController 的 excludedActivityTypes 属性即可。 以下是可以隐藏的对象
#6.0 开始支持
UIKIT_EXTERN NSString *const UIActivityTypePostToFacebook
UIKIT_EXTERN NSString *const UIActivityTypePostToTwitter
UIKIT_EXTERN NSString *const UIActivityTypePostToWeibo
UIKIT_EXTERN NSString *const UIActivityTypeMessage
UIKIT_EXTERN NSString *const UIActivityTypeMail
UIKIT_EXTERN NSString *const UIActivityTypePrint
UIKIT_EXTERN NSString *const UIActivityTypeCopyToPasteboard
UIKIT_EXTERN NSString *const UIActivityTypeAssignToContact
UIKIT_EXTERN NSString *const UIActivityTypeSaveToCameraRoll
#7.0 以后新增
UIKIT_EXTERN NSString *const UIActivityTypeAddToReadingList
UIKIT_EXTERN NSString *const UIActivityTypePostToFlickr
UIKIT_EXTERN NSString *const UIActivityTypePostToVimeo
UIKIT_EXTERN NSString *const UIActivityTypePostToTencentWeibo
UIKIT_EXTERN NSString *const UIActivityTypeAirDrop
具体用法如下，这里只保留 AirDrop：
NSArray *excludedActivities = @[UIActivityTypePostToFacebook,
UIActivityTypePostToTwitter,
UIActivityTypePostToWeibo,
UIActivityTypeMessage,
UIActivityTypeMail,
UIActivityTypePrint,
UIActivityTypeCopyToPasteboard,
UIActivityTypeAssignToContact,
UIActivityTypeSaveToCameraRoll,
UIActivityTypeAddToReadingList,
UIActivityTypePostToFlickr,
UIActivityTypePostToVimeo,
UIActivityTypePostToTencentWeibo];
activityViewController.excludedActivityTypes = excludedActivities;
完整的代码：
NSString *filePath = "Documents/aaa.png"
NSURL *url = [NSURL fileURLWithPath];
NSArray *items = [NSArray ArrayWithObjects,nil];
UIActivityViewController *activityViewController =
[[UIActivityViewController alloc] initWithActivityItems applicationActivities];
NSArray *excludedActivities = @[UIActivityTypePostToFacebook,
UIActivityTypePostToTwitter,
UIActivityTypePostToWeibo,
UIActivityTypeMessage,
UIActivityTypeMail,
UIActivityTypePrint,
UIActivityTypeCopyToPasteboard,
UIActivityTypeAssignToContact,
UIActivityTypeSaveToCameraRoll,
UIActivityTypeAddToReadingList,
UIActivityTypePostToFlickr,
UIActivityTypePostToVimeo,
UIActivityTypePostToTencentWeibo];
activityViewController.excludedActivityTypes = excludedActivities;
[self presentViewController animated completion];
关于文件路径 URL，一般 APP 的用户数据都在 APP 的 Documents 目录下，使用 "Documents/aaa.png" 的方式即可取得 如果需要使用 Bundle 路径下的文件可以使用以下方式
NSString *fileName=@"aaa.png"
NSArray *fileComponents = [filename componentsSeparatedByString:@"."];
NSString *filePath = nil;
if([fileComponents count] == 0) {
}else if([fileComponents count] == 1) {
filePath = [[NSBundle mainBundle] pathForResource:[fileComponents objectAtIndex:0]
ofType];
}else if([fileComponents count] == 2) {
filePath = [[NSBundle mainBundle] pathForResource:[fileComponents objectAtIndex:0]
ofType:[fileComponents objectAtIndex:1]];
}
NSURL *url = [NSURL fileURLWithPath];