如果你想在iOS程序中提供一仅在wifi网络下使用(Reeder),或者在没有网络状态下提供离线模式(Evernote)。那么你会使用到Reachability来实现网络检测。
Reachablity 是一个iOS下检测,iOS设备网络环境用的库。
苹果官方提供的Doc
http://developer.apple.com/library/ios/#samplecode/Reachability/Introduction/Intro.html
Github上的文档
https://github.com/tonymillion/Reachability
由于Reachability非常常用。直接将其加入到Supporting Files/networ-Prefix.pch中:
C代码 class="star" src="/Upload/Images/2014110516/40B102E0EF997EA6.png" alt="收藏代码" />spinner" style="display: none;" src="/Upload/Images/2014110516/4E072B8B8C20032D.gif" alt="" />
#import <Reachability/Reachability.h>
如果你还不知道cocoaspod是什么,看这里:
http://witcheryne.iteye.com/blog/1873221
stackoverflow上有一篇回答,很好的解释了reachability的用法
http://stackoverflow.com/questions/11177066/how-to-use-ios-reachability
C代码
- (void)viewDidLoad { [super viewDidLoad]; DLog(@"开启 www.apple.com 的网络检测"); Reachability* reach = [Reachability reachabilityWithHostname:@"www.apple.com"]; DLog(@"-- current status: %@", reach.currentReachabilityString); // start the notifier which will cause the reachability object to retain itself! [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name:kReachabilityChangedNotification object:nil]; reach.reachableBlock = ^(Reachability * reachability) { dispatch_async(dispatch_get_main_queue(), ^{ self.blockLabel.text = @"网络可用"; self.blockLabel.backgroundColor = [UIColor greenColor]; }); }; reach.unreachableBlock = ^(Reachability * reachability) { dispatch_async(dispatch_get_main_queue(), ^{ self.blockLabel.text = @"网络不可用"; self.blockLabel.backgroundColor = [UIColor redColor]; }); }; [reach startNotifier]; }
C代码
- (void)viewDidLoad { [super viewDidLoad]; DLog(@"开启 www.apple.com 的网络检测"); Reachability* reach = [Reachability reachabilityWithHostname:@"www.apple.com"]; DLog(@"-- current status: %@", reach.currentReachabilityString); // start the notifier which will cause the reachability object to retain itself! [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name:kReachabilityChangedNotification object:nil]; [reach startNotifier]; } - (void) reachabilityChanged: (NSNotification*)note { Reachability * reach = [note object]; if(![reach isReachable]) { self.notificationLabel.text = @"网络不可用"; self.notificationLabel.backgroundColor = [UIColor redColor]; self.wifiOnlyLabel.backgroundColor = [UIColor redColor]; self.wwanOnlyLabel.backgroundColor = [UIColor redColor]; return; } self.notificationLabel.text = @"网络可用"; self.notificationLabel.backgroundColor = [UIColor greenColor]; if (reach.isReachableViaWiFi) { self.wifiOnlyLabel.backgroundColor = [UIColor greenColor]; self.wifiOnlyLabel.text = @"当前通过wifi连接"; } else { self.wifiOnlyLabel.backgroundColor = [UIColor redColor]; self.wifiOnlyLabel.text = @"wifi未开启,不能用"; } if (reach.isReachableViaWWAN) { self.wwanOnlyLabel.backgroundColor = [UIColor greenColor]; self.wwanOnlyLabel.text = @"当前通过2g or 3g连接"; } else { self.wwanOnlyLabel.backgroundColor = [UIColor redColor]; self.wwanOnlyLabel.text = @"2g or 3g网络未使用"; } }