Reachability 通知多次

之前代码：

[[NSNotificationCenter defaultCenter] addObserver:self

selector:@selector(reachabilityChanged:)

name: kReachabilityChangedNotification

object: nil];

Reachability    *hostReach =[Reachability reachabilityWithHostname:@"haosou.com"]; 

[hostReach startNotifier];

修改后的代码：

[[NSNotificationCenter defaultCenter] addObserver:self

selector:@selector(reachabilityChanged:)

name: kReachabilityChangedNotification

object: nil];

Reachability    *hostReach =[Reachability reachabilityForInternetConnection];

[hostReach startNotifier];