使用之前请从Apple网站下载示例：点此下载https://github.com/tonymillion/Reachability然后将Reachability.h 和 Reachability.m 加到自己的项目中，并引用 SystemConfiguration.framework，就可以使用了。Reachability 中定义了3种网络状态:// the network s

#import "Reachability.h"@property (nonatomic,strong) Reachability* reach;- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOp