判断网络的连接

[[AFNetworkReachabilityManager sharedManager] startMonitoring];
[[AFNetworkReachabilityManager sharedManager] setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
NSString *netStatus;
if (status==-1) {
NSLog(@"未知");
netStatus=@"未知";
}else if (status==0){
NSLog(@"无连接");
netStatus=@"无连接";
}else if (status==1){
NSLog(@"2/3G");
netStatus=@"2/3G";
}else if (status==2){
NSLog(@"Wifi");
netStatus=@"Wifi";
}
//[self LoadAllData];
[[NSUserDefaults standardUserDefaults] setObject:netStatus forKey:@"netStatus"];
}];