检测网络

1.导入：Reachability 文件
2.导入：Reachability的头文件

3.复制代码：
+ (BOOL) isConnectionAvailable{

BOOL isExistenceNetwork = YES;

Reachability *reach = [Reachability reachabilityWithHostName:@"www.apple.com"];

switch ([reach currentReachabilityStatus]) {

case NotReachable:

isExistenceNetwork = NO;

//NSLog(@"notReachable");

break;

case ReachableViaWiFi:

isExistenceNetwork = YES;

//NSLog(@"WIFI");

break;

case ReachableViaWWAN:

isExistenceNetwork = YES;

//NSLog(@"3G");

break;

}

if (!isExistenceNetwork) {

[YZTools toastMake:@"没有网络" isPush:NO];

return NO;

}

return isExistenceNetwork;
}