检测是否在Wifi环境下,写成单例判断

#import <Foundation/Foundation.h>

#import "ASIFormDataRequest.h"

#import "Reachability.h"

@interface HttpHelper : NSObject

{

    Reachability* internetReach;

NetworkStatus netStatus;

}

+ (id) sharedHttpHelper;

- (BOOL)checkIsWifi;

@end

 ///////// ///////// ///////// ///////// ///////// ///////// ///////// ///////// ///////// ///////// ///////// ///////// ///////// ///////// 

#import "HttpHelper.h"

@implementation HttpHelper

static HttpHelper *_sharedInst = nil;

//

+ (id) sharedHttpHelper

{

@synchronized(self){

if(_sharedInst == nil)

{

_sharedInst = [[self alloc] init];

}

}

return_sharedInst;

}

-(id) init

{

if (self = [super init]) {  

//通知 (网络状态变化)

[[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(reachabilityChanged:) name: kReachabilityChangedNotification object: nil];

internetReach = [[ReachabilityreachabilityForInternetConnection]retain];

[internetReachstartNotifier];

netStatus = [internetReachcurrentReachabilityStatus];

}

returnself;

}

 //检测网络是否在WiFi条件下

- (BOOL)checkIsWifi//检测是否在wifi下

{

    if (netStatus == ReachableViaWiFi) {//网络状态是否是wifi下，如果是返回YES

        return YES;

    }

    returnNO;

}

- (void) reachabilityChanged: (NSNotification* )note

{

netStatus = [internetReachcurrentReachabilityStatus];

}

@end