iOS中使用Reachability 检测网络

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。 写本文的目的 了解Reachability都能做什么 检测3中网络环境 2G/3G wifi 如何使用通知 单个controller 多个controller 简单的功能: 仅在wifi下使用 Reachability简介 Reachablity 是一个iOS下检测,iOS设备网络环境用的库。 监视目标网络是否可用 监视当前网络的连接方式 监测连接方式的变更 创建 network 工程（network是我创建的demo工程，附件中可以下载到） 使用Cocoaspod安装依赖 在项目中添加 SystemConfiguration.framework 库 由于Reachability非常常用。直接将其加入到Supporting Files/networ-Prefix.pch中: #import Reachability/Reachability.h #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 一般情况一个Reachability实例就ok了。 一个Controller只需要一个Reachability Block方式使用
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]; - (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]; 使用notification的方式
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"; - (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";
开启wifi状态 关闭wifi的状态 遗留问题 如何在多个controller之前共用一个Reachability(附件demo中是一个controller一个Reachability实例) 应该在什么使用停止Reachability的检测. 最新内容请见作者的GitHub页：http://qaseven.github.io/

快速上手！实现经典检测网络 Mask R-CNN 的推理 简单来说，用 OpenMMLab 开发的模型，可以通过 OpenPPL 高效可靠地运行在现有的 CPU、GPU 等计算平台上，为云端场景提供人工智能推理服务。