iOS中如何判断网络连接状态

最近的项目中有的地方需要判断网络连接

参考 Reachability 文件 并进一步封装  现在把代码放到网上 大家可以做一个参考

导入 Reachability.h / .m 时记得导入  systemconfiguration.framework

这是Reachability 和 Network的下载地址：  下载文件包

JPNetwork.h

#import <Foundation/Foundation.h>

@interface JPNetwork : NSObject

/**
 * @brief           get the signalton engine object
 * @return          the engine object
 */
+ (JPNetwork *)sharedInstance;

/**
 * @brief           get the network statue
 */
- (BOOL)isNetworkReachable;

/**
 * @brief           Judgment wifi is connected
 */
- (BOOL)isEnableWIFI;

/**
 * @brief           To judge whether the 3G connection
 */
- (BOOL)isEnable3G;

+ (BOOL)isNetworkContected;

+ (void)networkBreak;

@end

JPNetwork.m

#import "JPNetwork.h"
#import "Reachability.h"

@implementation JPNetwork

static JPNetwork *g_instance = nil;


- (id)init
{
    self = [super init];
    if (self) {
        
    }
    return self;
}


/**
 * @brief           Whether there are single instance
 * @return          the result
 */
+ (BOOL)sharedInstanceExists
{
    return (nil != g_instance);
}

/**
 * @brief           get the signalton engine object
 * @return          the engine object
 */
+ (JPNetwork *)sharedInstance
{
    @synchronized(self) {
        if ( g_instance == nil ) {
            g_instance = [[[self  class] alloc] init];
            //any other specail init as required
        }
    }
    return g_instance;
}


/**
 * @brief           get the network statue
 */
- (BOOL)isNetworkReachable
{
    BOOL isReachable = NO;
    Reachability *reachability = [Reachability reachabilityWithHostName:@"www.baidu.com"];
    switch ([reachability currentReachabilityStatus]) {
        case NotReachable:{
            isReachable = NO;
        }
            break;
        case ReachableViaWWAN:{
            isReachable = YES;
        }
            break;
        case ReachableViaWiFi:{
            isReachable = YES;
        }
            break;
        default:
            isReachable = NO;
            break;
    }
    return isReachable;
}

/**
 * @brief           Judgment wifi is connected
 */
- (BOOL)isEnableWIFI
{
    return ([[Reachability reachabilityForLocalWiFi] currentReachabilityStatus] != NotReachable);
}

/**
 * @brief           To judge whether the 3G connection
 */
- (BOOL)isEnable3G
{
    return ([[Reachability reachabilityForInternetConnection] currentReachabilityStatus] != NotReachable);
}


+ (BOOL)isNetworkContected
{
    return  [[JPNetwork sharedInstance] isNetworkReachable];
}

+ (void)networkBreak
{
    UIAlertView *alter = [[UIAlertView alloc]initWithTitle:@"温馨提示" message:@"哎呦喂、网络不给力啊" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
    [alter show];
    [alter release];
}


@end

在工程中导入JPNetwork.h 之后

在需要判断网络连接状态的地方

if ([JPNetwork isNetworkContected] ) 
{
          //网络连接正常
}else{
          //无网络连接
       [JPNetwork networkBreak];
}