类似于一个网络状况的探针。　　[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(reachabilityChanged:)name:kReachabilityChangedNotificationobject:nil];&nbs...

先看Reachability.h发现#import<Foundation/Foundation.h>#import<SystemConfiguration/SystemConfiguration.h>#import<netinet/in.h>所以如果我们在项目中需要用到此类的话，需要...