http://www.cocoachina.com/ios/20171103/21039.html
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:
1. Reachability
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下载Demo(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
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:
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typedef enum : NSInteger { NotReachable = 0 , ReachableViaWiFi, ReachableViaWWAN } NetworkStatus; |
(1)获取网络状态:
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
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-(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; } |
(2)当用户为手机自带网络时,判断具体网络类型
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、
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- (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" ; } } |
用此方法判断的蜂窝网络类型有如下类型:
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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 |
2. 通过系统statusBar判断
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
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//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; } |
3. 通过AFNetworking
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
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#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" ); } }]; } |