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
  无网络
  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
  安装
  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
  使用
  *上有一篇回答,很好的解释了reachability的用法
  http://*.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
- (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];
}
- (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
- (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";
}
}
- (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";
}
}
  附件demo说明
  开启wifi状态
iOS中使用Reachability 检测网络
  关闭wifi的状态
iOS中使用Reachability 检测网络
  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/
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