1.通过AFNetworking的AFNetworkReachabilityManager对象
监听网络方法
- (void)netWorkMonitor{
manager = [AFNetworkReachabilityManager sharedManager];
[manager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
switch (status) {
case AFNetworkReachabilityStatusUnknown:
[ProgressHUD showSuccess:@"未识别的网络" Interaction:YES];
break;
case AFNetworkReachabilityStatusNotReachable:
[ProgressHUD showSuccess:@"网络不可用，请打开WiFi或者移动蜂窝网络" Interaction:YES];
break;
case AFNetworkReachabilityStatusReachableViaWWAN:
[ProgressHUD showError:@"2G,3G,4G...的网络" Interaction:YES];
break;
case AFNetworkReachabilityStatusReachableViaWiFi:
[ProgressHUD showSuccess:@"wifi的网络" Interaction:YES];
break;
default:
break;
}
}];
[manager startMonitoring];
}
调用
[self performSelector:@selector(netWorkMonitor) withObject:nil afterDelay:0.2];
2.Reachability对象
- 必须将 Reachability.h 和 Reachability.m 拷贝到工程中。
- 导入#import "Reachability.h"
//监听部分
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name:kReachabilityChangedNotification object:nil];
self.reach = [Reachability reachabilityWithHostName:@"www.baidu.com"];
// 让Reachability对象开启被监听状态
[self.reach startNotifier];
//网络状态改变，弹出alertview提示框。
- (void)reachabilityChanged:(NSNotification *)note
{
// 通过通知对象获取被监听的Reachability对象
Reachability *curReach = [note object];
// 获取Reachability对象的网络状态
NetworkStatus status = [curReach currentReachabilityStatus];
if (status == NotReachable)
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提醒" message:@"不能访问网络，请检查网络" delegate:nil cancelButtonTitle:@"YES" otherButtonTitles:nil];
[alert show];
}
}
注意：使用Reachability发通知的时候，在模拟器中网络状态改变reachabilityChanged一直会被调用两次，查了好久不知道什么原因。这种情况不知道只有我碰到了还是？
- Reachability写法2
-(void)checkInternet
{
self.internetReachability = [Reachability reachabilityForInternetConnection];
if (self.internetReachability.currentReachabilityStatus==NotReachable)
{
NSLog(@"网络不可用...");
[self internetAlertView];
} else{
NSLog(@"网络可用...");
}
[self.internetReachability startNotifier];
}
-(void)internetAlertView
{
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"提示" message:@"不能访问网络，请检查网络!" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alertView show];
}
3.使用netdb.h
- 必须导入如下头文件
include<unistd.h>
include<netdb.h>
+ 在Appdelegate.h文件中
-(BOOL)checkInternetConnection;
+ 在Appdelegate.m文件中
-(BOOL)checkInternetConnection {
char *hostname;
struct hostent *hostinfo;
hostname = "baidu.com";
hostinfo = gethostbyname (hostname);
if (hostinfo == NULL)
{
NSLog(@"-> no connection!\n");
return NO;
}
else{
NSLog(@"-> connection established!\n");
return YES;
}
}
