[IOS]如何判断网络状态

[IOS]如何判断网络状态

1.先复制Reachability代码：

.h：

#import #import #import typedef enum : NSInteger { NotReachable = 0, ReachableViaWiFi, ReachableViaWWAN} NetworkStatus;#pragma mark IPv6 协议支持// Reachability完全支持IPv6协议.extern NSString *kReachabilityChangedNotification;@interface Reachability : NSObject/*! * 用来检测hostName的连接状态. */+ (instancetype)reachabilityWithHostName:(NSString *)hostName;/*! * 用来检测IP地址的连接状态. */+(instancetype)reachabilityWithAddress:(const struct sockaddr *)hostAddress;/*! * 用来检测默认的连接是否可用, 被用在没有特定连接的主机. */+ (instancetype)reachabilityForInternetConnection;/*! *开始在当前时间循环中监听Reachability通知. */- (BOOL)startNotifier; - (void)stopNotifier;- (NetworkStatus)currentReachabilityStatus;/*! * 除非连接已经建立,WWAN可用,但是却没有激活. WiFi 连结也许需要一个VPN来进行连接. */- (BOOL)connectionRequired;@end

.m:

#import "Reachability.h"#import #import #import #import #import #import #import "Reachability.h"#pragma mark IPv6 协议支持// Reachability完全支持IPv6协议.NSString *kReachabilityChangedNotification = @"kNetworkReachabilityChangedNotification";#pragma mark - 支持Reachability的方法#define kShouldPrintReachabilityFlags 1static void PrintReachabilityFlags(SCNetworkReachabilityFlags flags, const char* comment) {#if kShouldPrintReachabilityFlags NSLog(@"Reachability Flag Status: %c%c %c%c%c%c%c%c%c %s\n", (flags & kSCNetworkReachabilityFlagsIsWWAN) ? 'W' : '-', (flags & kSCNetworkReachabilityFlagsReachable) ? 'R' : '-', (flags & kSCNetworkReachabilityFlagsTransientConnection) ? 't' : '-', (flags & kSCNetworkReachabilityFlagsConnectionRequired) ? 'c' : '-', (flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) ? 'C' : '-', (flags & kSCNetworkReachabilityFlagsInterventionRequired) ? 'i' : '-', (flags & kSCNetworkReachabilityFlagsConnectionOnDemand) ? 'D' : '-', (flags & kSCNetworkReachabilityFlagsIsLocalAddress) ? 'l' : '-', (flags & kSCNetworkReachabilityFlagsIsDirect) ? 'd' : '-', comment );#endif}static void ReachabilityCallback(SCNetworkReachabilityRef target, SCNetworkReachabilityFlags flags, void* info) {#pragma 没有用的(target, flags) NSCAssert(info != NULL, @"info was NULL in ReachabilityCallback"); NSCAssert([(__bridge NSObject*) info isKindOfClass: [Reachability class]], @"info was wrong class in ReachabilityCallback"); Reachability* noteObject = (__bridge Reachability *)info; // Post a notification to notify the client that the network reachability changed. [[NSNotificationCenter defaultCenter] postNotificationName: kReachabilityChangedNotification object: noteObject]; }#pragma mark - Reachability的实现@implementation Reachability{ SCNetworkReachabilityRef _reachabilityRef; }+ (instancetype)reachabilityWithHostName:(NSString *)hostName { Reachability* returnValue = NULL; SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithName(NULL, [hostName UTF8String]); if (reachability != NULL) { returnValue= [[self alloc] init]; if (returnValue != NULL) { returnValue->_reachabilityRef = reachability; } else { CFRelease(reachability); } } return returnValue;}+ (instancetype)reachabilityWithAddress:(const struct sockaddr *)hostAddress { SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithAddress(kCFAllocatorDefault, hostAddress); Reachability* returnValue = NULL; if (reachability != NULL) { returnValue = [[self alloc] init]; if (returnValue != NULL) { returnValue->_reachabilityRef = reachability; } else { CFRelease(reachability); } } return returnValue;}+ (instancetype)reachabilityForInternetConnection { struct sockaddr_in zeroAddress; bzero(&zeroAddress, sizeof(zeroAddress)); zeroAddress.sin_len = sizeof(zeroAddress); zeroAddress.sin_family = AF_INET; return [self reachabilityWithAddress: (const struct sockaddr *) &zeroAddress];}#pragma mark - 开始和结束监听通知- (BOOL)startNotifier { BOOL returnValue = NO; SCNetworkReachabilityContext context = {0, (__bridge void *)(self), NULL, NULL, NULL}; if (SCNetworkReachabilitySetCallback(_reachabilityRef, ReachabilityCallback, &context)){ if (SCNetworkReachabilityScheduleWithRunLoop(_reachabilityRef, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode)){ returnValue = YES; } } return returnValue;}- (void)stopNotifier { if (_reachabilityRef != NULL) { SCNetworkReachabilityUnscheduleFromRunLoop(_reachabilityRef, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode); }}- (void)dealloc { [self stopNotifier]; if (_reachabilityRef != NULL) { CFRelease(_reachabilityRef); } }#pragma mark - Network Flag Handling- (NetworkStatus)networkStatusForFlags:(SCNetworkReachabilityFlags)flags { PrintReachabilityFlags(flags, "networkStatusForFlags"); if ((flags & kSCNetworkReachabilityFlagsReachable) == 0){ // The target host is not reachable. return NotReachable; } NetworkStatus returnValue = NotReachable; if ((flags & kSCNetworkReachabilityFlagsConnectionRequired) == 0) { /* If the target host is reachable and no connection is required then we'll assume (for now) that you're on Wi-Fi... */ returnValue = ReachableViaWiFi; } if ((((flags & kSCNetworkReachabilityFlagsConnectionOnDemand ) != 0) || (flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) != 0)) { /* ... and the connection is on-demand (or on-traffic) if the calling application is using the CFSocketStream or higher APIs... */ if ((flags & kSCNetworkReachabilityFlagsInterventionRequired) == 0) { /* ... and no [user] intervention is needed... */ returnValue = ReachableViaWiFi; } } if ((flags & kSCNetworkReachabilityFlagsIsWWAN) == kSCNetworkReachabilityFlagsIsWWAN) { /* ... but WWAN connections are OK if the calling application is using the CFNetwork APIs. */ returnValue = ReachableViaWWAN; } return returnValue;}- (BOOL)connectionRequired { NSAssert(_reachabilityRef != NULL, @"connectionRequired called with NULL reachabilityRef"); SCNetworkReachabilityFlags flags; if (SCNetworkReachabilityGetFlags(_reachabilityRef, &flags)) { return (flags & kSCNetworkReachabilityFlagsConnectionRequired); } return NO;}- (NetworkStatus)currentReachabilityStatus { NSAssert(_reachabilityRef != NULL, @"currentNetworkStatus called with NULL SCNetworkReachabilityRef"); NetworkStatus returnValue = NotReachable; SCNetworkReachabilityFlags flags; if (SCNetworkReachabilityGetFlags(_reachabilityRef, &flags)){ returnValue = [self networkStatusForFlags:flags]; } return returnValue;}@end

2.使用:

#import "AppDelegate.h"#import "Reachability.h"@interface AppDelegate ()//定义属性@property(nonatomic,strong)Reachability *reachability;@end@implementation AppDelegate- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { //创建通知 [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(internetConnection) name:kReachabilityChangedNotification object:nil]; //初始化可达性 self.reachability =[Reachability reachabilityForInternetConnection]; //开始监听 [self.reachability startNotifier]; [self internetConnection]; return YES;}-(void)internetConnection{ //网络连接现状 NetworkStatus status =[self.reachability currentReachabilityStatus]; switch (status) { case NotReachable: NSLog(@"没有网络"); break; case ReachableViaWiFi: NSLog(@"wifi连接"); break; case ReachableViaWWAN: NSLog(@"移动蜂窝网络"); break; default: break; }}

可以放在Appdelegate中，作为全局使用。也可以放在需要检测网络连接状态的地方使用。

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