监测网络状态
转自 http://www.cnblogs.com/wendingding/p/3950114.html#
有些许修改
#import "YYViewController.h"
#import "Reachability.h"
@interface YYViewController ()
@property (nonatomic, strong) Reachability *conn;
@end
@implementation YYViewController
- (void)viewDidLoad
{
[super viewDidLoad];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(networkStateChange)
name:kReachabilityChangedNotification object:nil];
self.conn = [Reachability reachabilityForInternetConnection];
[self.conn startNotifier];
[[NSNotificationCenter defaultCenter] postNotificationName:kReachabilityChangedNotification object:nil];//发通知（增加）
}
- (void)dealloc
{
[self.conn stopNotifier];
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
- (void)networkStateChange
{
[self checkNetworkState];
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
}
- (void)checkNetworkState
{
// 1.检测wifi状态
Reachability *wifi = [Reachability reachabilityForLocalWiFi];
// 2.检测手机是否能上网络(WIFI\3G\2.5G)
Reachability *conn = [Reachability reachabilityForInternetConnection];
// 3.判断网络状态
if ([wifi currentReachabilityStatus] != NotReachable) { // 有wifi
NSLog(@"有wifi");
} else if ([conn currentReachabilityStatus] != NotReachable) { // 没有使用wifi, 使用手机自带网络进行上网
NSLog(@"使用手机自带网络进行上网");
} else { // 没有网络
NSLog(@"没有网络");
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil
message:@"没有网络请检查网络设置"
delegate:nil
cancelButtonTitle:@"确定"
otherButtonTitles:nil];
[alert show];
alert = nil;
}
}
@end
// 用WIFI
// [wifi currentReachabilityStatus] != NotReachable
// [conn currentReachabilityStatus] != NotReachable
// 没有用WIFI, 只用了手机网络
// [wifi currentReachabilityStatus] == NotReachable
// [conn currentReachabilityStatus] != NotReachable
// 没有网络
// [wifi currentReachabilityStatus] == NotReachable
// [conn currentReachabilityStatus] == NotReachable
这只是网络状态改变时就会检测到，但一开始就没网络的状态下需要自己判断再提示信息