iOS中使用Reachability 檢測網絡
如果你想在iOS程序中提供一僅在wifi網絡下使用(Reeder),或者在沒有網絡狀態下提供離線模式(Evernote)。那么你會使用到Reachability來實現網絡檢測。
寫本文的目的
了解Reachability都能做什么
檢測3中網絡環境
2G/3G
wifi
無網絡
如何使用通知
單個controller
多個controller
簡單的功能:
僅在wifi下使用
Reachability簡介
Reachablity 是一個iOS下檢測,iOS設備網絡環境用的庫。
監視目標網絡是否可用
監視當前網絡的連接方式
監測連接方式的變更
安裝
創建 network 工程(network是我創建的demo工程,附件中可以下載到)
使用Cocoaspod安裝依賴
在項目中添加 SystemConfiguration.framework 庫
由于Reachability非常常用。直接將其加入到Supporting Files/networ-Prefix.pch中:
#import <Reachability/Reachability.h>
#import <Reachability/Reachability.h>
如果你還不知道cocoaspod是什么,看這里:
http://witcheryne.iteye.com/blog/1873221
使用
stackoverflow上有一篇回答,很好的解釋了reachability的用法
http://stackoverflow.com/questions/11177066/how-to-use-ios-reachability
一般情況一個Reachability實例就ok了。
一個Controller只需要一個Reachability
Block方式使用
- (void)viewDidLoad { [super viewDidLoad]; DLog(@"開啟 www.apple.com 的網絡檢測"); 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 = @"網絡可用"; self.blockLabel.backgroundColor = [UIColor greenColor]; }); }; reach.unreachableBlock = ^(Reachability * reachability) { dispatch_async(dispatch_get_main_queue(), ^{ self.blockLabel.text = @"網絡不可用"; self.blockLabel.backgroundColor = [UIColor redColor]; }); }; [reach startNotifier]; } - (void)viewDidLoad { [super viewDidLoad]; DLog(@"開啟 www.apple.com 的網絡檢測"); 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 = @"網絡可用"; self.blockLabel.backgroundColor = [UIColor greenColor]; }); }; reach.unreachableBlock = ^(Reachability * reachability) { dispatch_async(dispatch_get_main_queue(), ^{ self.blockLabel.text = @"網絡不可用"; self.blockLabel.backgroundColor = [UIColor redColor]; }); }; [reach startNotifier]; } |
使用notification的方式
- (void)viewDidLoad { [super viewDidLoad]; DLog(@"開啟 www.apple.com 的網絡檢測"); 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 = @"網絡不可用"; self.notificationLabel.backgroundColor = [UIColor redColor]; self.wifiOnlyLabel.backgroundColor = [UIColor redColor]; self.wwanOnlyLabel.backgroundColor = [UIColor redColor]; return; } self.notificationLabel.text = @"網絡可用"; self.notificationLabel.backgroundColor = [UIColor greenColor]; if (reach.isReachableViaWiFi) { self.wifiOnlyLabel.backgroundColor = [UIColor greenColor]; self.wifiOnlyLabel.text = @"當前通過wifi連接"; } else { self.wifiOnlyLabel.backgroundColor = [UIColor redColor]; self.wifiOnlyLabel.text = @"wifi未開啟,不能用"; } if (reach.isReachableViaWWAN) { self.wwanOnlyLabel.backgroundColor = [UIColor greenColor]; self.wwanOnlyLabel.text = @"當前通過2g or 3g連接"; } else { self.wwanOnlyLabel.backgroundColor = [UIColor redColor]; self.wwanOnlyLabel.text = @"2g or 3g網絡未使用"; } } - (void)viewDidLoad { [super viewDidLoad]; DLog(@"開啟 www.apple.com 的網絡檢測"); 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 = @"網絡不可用"; self.notificationLabel.backgroundColor = [UIColor redColor]; self.wifiOnlyLabel.backgroundColor = [UIColor redColor]; self.wwanOnlyLabel.backgroundColor = [UIColor redColor]; return; } self.notificationLabel.text = @"網絡可用"; self.notificationLabel.backgroundColor = [UIColor greenColor]; if (reach.isReachableViaWiFi) { self.wifiOnlyLabel.backgroundColor = [UIColor greenColor]; self.wifiOnlyLabel.text = @"當前通過wifi連接"; } else { self.wifiOnlyLabel.backgroundColor = [UIColor redColor]; self.wifiOnlyLabel.text = @"wifi未開啟,不能用"; } if (reach.isReachableViaWWAN) { self.wwanOnlyLabel.backgroundColor = [UIColor greenColor]; self.wwanOnlyLabel.text = @"當前通過2g or 3g連接"; } else { self.wwanOnlyLabel.backgroundColor = [UIColor redColor]; self.wwanOnlyLabel.text = @"2g or 3g網絡未使用"; } } |
附件demo說明
開啟wifi狀態
關閉wifi的狀態
遺留問題
如何在多個controller之前共用一個Reachability(附件demo中是一個controller一個Reachability實例)
應該在什么使用停止Reachability的檢測.
posted on 2014-12-03 13:31 順其自然EVO 閱讀(203) 評論(0) 編輯 收藏 所屬分類: android