iOS 判断当前网络状态的三种方法

FriedaForwo 2年前
   <p>在项目中,为了好的用户体验,有些场景必须线判断网络状态,然后才能决定改干嘛。比如视频播放,需要线判断是Wifi还是4G,Wifi直接播放,4G先提示用户。获取网络状态的方法大概有三种:</p>    <p>1. Reachability</p>    <p>这是苹果的官方演示demo中使用到的方法,我们可以到苹果官方文档里 <a href="/misc/goto?guid=4959755182788897748" rel="nofollow,noindex">下载Demo</a> (点击左上角Download Sample Code 即可下载),然后把Demo里的Reachability.h和.m考到自己项目中,并在Build Phases 的 Link Binary 添加SystemConfiguration.framework框架,然后在需要使用的地方导入Reachability头文件</p>    <p>在 Reachability头文件中我们可以看到无网络,wifi和蜂窝网三个网络状态的枚举值,如下:</p>    <pre>  <code class="language-objectivec">typedef enum : NSInteger {      NotReachable = 0,      ReachableViaWiFi,      ReachableViaWWAN  } NetworkStatus;</code></pre>    <p>(1)获取网络状态:</p>    <p>在iOS 7之前,当用户网络为蜂窝网络时,是没法判断3G、4G等网络类型的,iOS 7 后是可以判断的</p>    <pre>  <code class="language-objectivec">-(NSString *)internetStatus {            Reachability *reachability   = [Reachability reachabilityWithHostName:@"www.apple.com"];      NetworkStatus internetStatus = [reachability currentReachabilityStatus];      NSString *net = @"WIFI";      switch (internetStatus) {          case ReachableViaWiFi:              net = @"WIFI";              break;                        case ReachableViaWWAN:              net = @"蜂窝数据";              //net = [self getNetType ];   //判断具体类型              break;                        case NotReachable:              net = @"当前无网路连接";                        default:              break;      }         return net;  }</code></pre>    <p>(2)当用户为手机自带网络时,判断具体网络类型</p>    <p>这时可以使用系统自带的API来判断是2G、3G还是4G,这就要使用到CTTelephonyNetworkInfo这类,记得在工程添加CoreTelephony.framework,并导入头文件 、</p>    <pre>  <code class="language-objectivec">- (NSString *)getNetType  {         CTTelephonyNetworkInfo *info = [[CTTelephonyNetworkInfo alloc] init];              NSString *currentStatus = info.currentRadioAccessTechnology;              if ([currentStatus isEqualToString:@"CTRadioAccessTechnologyGPRS"]) {                  netconnType = @"GPRS";              }else if ([currentStatus isEqualToString:@"CTRadioAccessTechnologyEdge"]) {                  netconnType = @"2.75G EDGE";              }else if ([currentStatus isEqualToString:@"CTRadioAccessTechnologyWCDMA"]){                  netconnType = @"3G";              }else if ([currentStatus isEqualToString:@"CTRadioAccessTechnologyHSDPA"]){                  netconnType = @"3.5G HSDPA";              }else if ([currentStatus isEqualToString:@"CTRadioAccessTechnologyHSUPA"]){                  netconnType = @"3.5G HSUPA";              }else if ([currentStatus isEqualToString:@"CTRadioAccessTechnologyCDMA1x"]){                  netconnType = @"2G";              }else if ([currentStatus isEqualToString:@"CTRadioAccessTechnologyCDMAEVDORev0"]){                  netconnType = @"3G";              }else if ([currentStatus isEqualToString:@"CTRadioAccessTechnologyCDMAEVDORevA"]){                  netconnType = @"3G";              }else if ([currentStatus isEqualToString:@"CTRadioAccessTechnologyCDMAEVDORevB"]){                  netconnType = @"3G";              }else if ([currentStatus isEqualToString:@"CTRadioAccessTechnologyeHRPD"]){                  netconnType = @"HRPD";              }else if ([currentStatus isEqualToString:@"CTRadioAccessTechnologyLTE"]){                  netconnType = @"4G";              }  }</code></pre>    <p>用此方法判断的蜂窝网络类型有如下类型:</p>    <pre>  <code class="language-objectivec">CTRadioAccessTechnologyGPRS         //介于2G和3G之间,也叫2.5G ,过度技术      CTRadioAccessTechnologyEdge         //EDGE为GPRS到第三代移动通信的过渡,EDGE俗称2.75G     CTRadioAccessTechnologyWCDMA             CTRadioAccessTechnologyHSDPA            //亦称为3.5G(3?G)    CTRadioAccessTechnologyHSUPA            //3G到4G的过度技术    CTRadioAccessTechnologyCDMA1x       //3G        CTRadioAccessTechnologyCDMAEVDORev0    //3G标准    CTRadioAccessTechnologyCDMAEVDORevA      CTRadioAccessTechnologyCDMAEVDORevB      CTRadioAccessTechnologyeHRPD        //电信使用的一种3G到4G的演进技术, 3.75G         CTRadioAccessTechnologyLTE          //接近4G</code></pre>    <p>2. 通过系统statusBar判断</p>    <p>这种方法在iPhone X 上可能引起奔溃,可能是苹果修改了statusBar的keyPath,所以拿到的东西为nil,导致崩溃</p>    <pre>  <code class="language-objectivec">//获取当前网络状态  (iPhone X 上可能引发崩溃)  + (NSString *)networkingStatesFromStatebar {        // 状态栏是由当前app控制的,首先获取当前app        UIApplication *app = [UIApplication sharedApplication];        //iphone X 会在这里崩溃      NSArray *children = [[[app valueForKeyPath:@"statusBar"] valueForKeyPath:@"foregroundView"] subviews];                  int type = 0;        for (id child in children) {            if ([child isKindOfClass:[NSClassFromString(@"UIStatusBarDataNetworkItemView") class]]) {                type = [[child valueForKeyPath:@"dataNetworkType"] intValue];            }        }                NSString *stateString = @"wifi";                switch (type) {            case 0:                stateString = @"notReachable";                break;                            case 1:                stateString = @"2G";                break;                            case 2:                stateString = @"3G";                break;                            case 3:                stateString = @"4G";                break;                            case 4:                stateString = @"LTE";                break;                            case 5:                stateString = @"wifi";                break;                            default:                break;        }                return stateString;    }</code></pre>    <p>3. 通过AFNetworking</p>    <p>此方法可以写在AppDelegate中,每当网络状态发生变化时,就可以发通知,实时监测网络变化,然后做相应的处理</p>    <pre>  <code class="language-objectivec">#pragma mark - ------------- 监测网络状态 -------------  - (void)monitorNetworking  {      [[AFNetworkReachabilityManager sharedManager] startMonitoring];      [[AFNetworkReachabilityManager sharedManager] setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {          switch (status) {              case -1:                  NSLog(@"未知网络");                  break;              case 0:                  NSLog(@"网络不可达");                  break;              case 1:              {                  NSLog(@"GPRS网络");                  //发通知,带头搞事                  [[NSNotificationCenter defaultCenter] postNotificationName:@"monitorNetworking" object:@"1" userInfo:nil];              }                  break;              case 2:              {                  NSLog(@"wifi网络");                  //发通知,搞事情                  [[NSNotificationCenter defaultCenter] postNotificationName:@"monitorNetworking" object:@"2" userInfo:nil];              }                  break;              default:                  break;          }          if (status == AFNetworkReachabilityStatusReachableViaWWAN || status == AFNetworkReachabilityStatusReachableViaWiFi) {              NSLog(@"有网");          }else{              NSLog(@"没网");          }      }];  }</code></pre>    <p> </p>    <p>来自:http://www.cocoachina.com/ios/20171103/21039.html</p>    <p> </p>