ios檢測網路狀態改變
阿新 • • 發佈:2019-01-29
使用之前請從Apple網站下載示例:點此下載
然後將Reachability.h 和 Reachability.m 加到自己的專案中,並引用 SystemConfiguration.framework,就可以使用了。
Reachability 中定義了3種網路狀態:
// the network state of the device for Reachability 1.5. typedef enum { NotReachable = 0, //無連線 ReachableViaCarrierDataNetwork, //使用3G/GPRS網路 ReachableViaWiFiNetwork //使用WiFi網路 } NetworkStatus; // the network state of the device for Reachability 2.0. typedef enum { NotReachable = 0, //無連線 ReachableViaWiFi, //使用3G/GPRS網路 ReachableViaWWAN //使用WiFi網路 } NetworkStatus;
比如檢測某一特定站點的接續狀況,可以使用下面的程式碼:
Reachability *r = [Reachability reachabilityWithHostName:@“www.apple.com”];switch ([r currentReachabilityStatus]) { case NotReachable: // 沒有網路連線 break; case ReachableViaWWAN: // 使用3G網路 break; case ReachableViaWiFi: // 使用WiFi網路 break; }
檢測當前網路環境:
// 是否wifi + (BOOL) IsEnableWIFI { return ([[Reachability reachabilityForLocalWiFi] currentReachabilityStatus] != NotReachable); }// 是否3G + (BOOL) IsEnable3G { return ([[Reachability reachabilityForInternetConnection] currentReachabilityStatus] != NotReachable); }
連線狀態實時通知
網路連線狀態的實時檢查,通知在網路應用中也是十分必要的。接續狀態發生變化時,需要及時地通知使用者。由於Reachability1.5版與2.0版有一些變化,這裡分開來說明使用方法。
Reachability 1.5
// My.AppDelegate.h #import "Reachability.h" @interface MyAppDelegate : NSObject <UIApplicationDelegate> { NetworkStatus remoteHostStatus; } @property NetworkStatus remoteHostStatus; @end // My.AppDelegate.m #import "MyAppDelegate.h" @implementation MyAppDelegate @synthesize remoteHostStatus; // 更新網路狀態 - (void)updateStatus { self.remoteHostStatus = [[Reachability sharedReachability] remoteHostStatus]; } // 通知網路狀態 - (void)reachabilityChanged:(NSNotification *)note { [self updateStatus]; if (self.remoteHostStatus == NotReachable) { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"AppName", nil) message:NSLocalizedString(@"NotReachable", nil) delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil]; [alert show]; [alert release]; } } // 程式啟動器,啟動網路監視 - (void)applicationDidFinishLaunching:(UIApplication *)application { // 設定網路檢測的站點 [[Reachability sharedReachability] setHostName:@"www.apple.com"]; [[Reachability sharedReachability] setNetworkStatusNotificationsEnabled:YES]; // 設定網路狀態變化時的通知函式 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name:@"kNetworkReachabilityChangedNotification" object:nil]; [self updateStatus]; } - (void)dealloc { // 刪除通知物件 [[NSNotificationCenter defaultCenter] removeObserver:self]; [window release]; [super dealloc]; }
Reachability 2.0
// MyAppDelegate.h @class Reachability; @interface MyAppDelegate : NSObject <UIApplicationDelegate> { Reachability *hostReach; } @end // MyAppDelegate.m - (void)reachabilityChanged:(NSNotification *)note { Reachability* curReach = [note object]; NSParameterAssert([curReach isKindOfClass: [Reachability class]]); NetworkStatus status = [curReach currentReachabilityStatus]; if (status == NotReachable) { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"AppName"" message:@"NotReachable" delegate:nil cancelButtonTitle:@"YES" otherButtonTitles:nil]; [alert show]; [alert release]; } } - (void)applicationDidFinishLaunching:(UIApplication *)application { // ... // 監測網路情況 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name: kReachabilityChangedNotification object: nil]; hostReach = [[Reachability reachabilityWithHostName:@"www.google.com"] retain]; [hostReach startNotifer]; // ... }