1、首先下载Reachability这个类
1.1、修改Reachability.h的枚举类型为
typedef enum : NSInteger {
kNotReachable = 0, //无网络
kReachableViaWiFi, // wifi
kReachableViaWWAN, // 手机网络
kReachableVia2G, // 2g
kReachableVia3G, // 3g
kReachableVia4G //4g
} NetworkStatus;
1.2、在Reachability.h 中导入
#import <CoreTelephony/CTTelephonyNetworkInfo.h>
#import <UIKit/UIKit.h>
1.3、修改- (NetworkStatus) networkStatusForFlags: (SCNetworkReachabilityFlags) flags 方法
- (NetworkStatus) networkStatusForFlags: (SCNetworkReachabilityFlags) flags {
if (flags & kSCNetworkReachabilityFlagsReachable) {
// Local WiFi -- Test derived from Apple's code: -localWiFiStatusForFlags:.
if (self.key == kLocalWiFiConnection) {
// Reachability Flag Status: xR xxxxxxd Reachable.
return (flags & kSCNetworkReachabilityFlagsIsDirect) ? kReachableViaWiFi : kNotReachable;
}
// Observed WWAN Values:
// WWAN Active: Reachability Flag Status: WR -t-----
// WWAN Connection required: Reachability Flag Status: WR ct-----
//
// Test Value: Reachability Flag Status: WR xxxxxxx
/**
* 当前网络为手机网络，在区分2g、3g、4g
*/
if (flags & kSCNetworkReachabilityFlagsIsWWAN) {
/**
* 如果系统大于7.0
*/
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0)
{
CTTelephonyNetworkInfo * info = [[CTTelephonyNetworkInfo alloc] init];
NSString *currentRadioAccessTechnology = info.currentRadioAccessTechnology;
if (currentRadioAccessTechnology)
{
if ([currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyLTE])
{
return kReachableVia4G;
}
else if ([currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyEdge] || [currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyGPRS])
{
return kReachableVia2G;
}
else
{
return kReachableVia3G;
}
}
}
if ((flags & kSCNetworkReachabilityFlagsTransientConnection) == kSCNetworkReachabilityFlagsTransientConnection)
{
if((flags & kSCNetworkReachabilityFlagsConnectionRequired) == kSCNetworkReachabilityFlagsConnectionRequired)
{
return kReachableVia2G;
}
return kReachableVia3G;
}
return kReachableViaWWAN; }
// Clear moot bits.
flags &= ~(uint32_t)kSCNetworkReachabilityFlagsReachable;
flags &= ~(uint32_t)kSCNetworkReachabilityFlagsIsDirect;
flags &= ~(uint32_t)kSCNetworkReachabilityFlagsIsLocalAddress; // kInternetConnection is local.
// Reachability Flag Status: -R ct---xx Connection down.
if (flags == kConnectionDown) { return kNotReachable; }
// Reachability Flag Status: -R -t---xx Reachable. WiFi + VPN(is up) (Thank you Ling Wang)
if (flags & kSCNetworkReachabilityFlagsTransientConnection) { return kReachableViaWiFi; }
// Reachability Flag Status: -R -----xx Reachable.
if (flags == 0) { return kReachableViaWiFi; }
// Apple's code tests for dynamic connection types here. I don't.
// If a connection is required, regardless of whether it is on demand or not, it is a WiFi connection.
// If you care whether a connection needs to be brought up, use -isConnectionRequired.
// If you care about whether user intervention is necessary, use -isInterventionRequired.
// If you care about dynamically establishing the connection, use -isConnectionIsOnDemand.
// Reachability Flag Status: -R cxxxxxx Reachable.
if (flags & kSCNetworkReachabilityFlagsConnectionRequired) { return kReachableViaWiFi; }
// Required by the compiler. Should never get here. Default to not connected.
#if (defined DEBUG && defined CLASS_DEBUG)
NSAssert1(NO, @"Uncaught reachability test. Flags: %@", reachabilityFlags_(flags));
#endif
return kNotReachable;
}
// Reachability Flag Status: x- xxxxxxx
return kNotReachable;
} // networkStatusForFlags:
2、使用
2.1在AppDelegate中声明一个变量
@property (nonatomic,strong) Reachability *reachability;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// 监听网络状态
[self reachTheNetState];
return YES;
}
实现
- (void)reachTheNetState {
//1、监听网络变化的通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(netStateChange:) name:kReachabilityChangedNotification object:nil];
//2、实例化对象
self.reachability = [Reachability reachabilityForInternetConnection];
//3、开始监听
[self.reachability startNotifier];
}
网络改变的收到的通知
- (void)netStateChange:(NSNotification*)notice {
Reachability* curReach = [notice object];
NSParameterAssert([curReach isKindOfClass: [Reachability class]]);
NetworkStatus status = [curReach currentReachabilityStatus];
switch (status)
{
case kNotReachable:
[self showMessage:@"网络连接不可用"];
break;
case kReachableViaWiFi:
case kReachableViaWWAN:
[self showMessage:@"wifi网络"];
break;
case kReachableVia2G:
[self showMessage:@"2G网络"];
break;
case kReachableVia3G:
[self showMessage:@"3G网络"];
break;
case kReachableVia4G:
[self showMessage:@"4G网络"];
break;
}
}
移除通知
- (void)dealloc
{
[self.reachability stopNotifier];
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
搞定收工！！！
