IOS-網絡（監聽網絡狀態）

?

//
//  BWNetWorkTool.h
//  IOS_0131_檢測網絡狀態
//
//  Created by ma c on 16/1/31.
//  Copyright ? 2016年 博文科技. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface BWNetWorkTool : NSObject
///是否是WiFi
+ (BOOL)isEnableWiFi;
///是否是3G
+ (BOOL)isEnable3G;

@end

//
//  BWNetWorkTool.m
//  IOS_0131_檢測網絡狀態
//
//  Created by ma c on 16/1/31.
//  Copyright ? 2016年 博文科技. All rights reserved.
//

#import "BWNetWorkTool.h"
#import "Reachability.h"

@implementation BWNetWorkTool

//是否是WiFi
+ (BOOL)isEnableWiFi
{
    return [[Reachability reachabilityForLocalWiFi] currentReachabilityStatus] !=NotReachable;
}
//是否是3G
+ (BOOL)isEnable3G
{
    return [[Reachability reachabilityForInternetConnection] currentReachabilityStatus] !=NotReachable;
}


@end

//
//  ViewController.m
//  IOS_0131_檢測網絡狀態
//
//  Created by ma c on 16/1/31.
//  Copyright ? 2016年 博文科技. All rights reserved.
//

#import "ViewController.h"
#import "Reachability.h"
#import "BWNetWorkTool.h"

@interface ViewController ()

@property (nonatomic, strong) Reachability *reachability;

@end

@implementation ViewController
/*
 檢測網絡狀態
 1.在網絡應用中，需要對用戶設備的網絡狀態進行實時監控，目的：
   a.讓用戶了解自己的網絡狀態，防止一些誤會（怪應用無能）
   b.根據用戶的網絡狀態進行智能處理，節省用戶流量，提高用戶體驗
     WIFI/3G/4G網絡：自動下載高清圖片
            低速網絡：只能下載縮略圖
            沒有網絡：智能顯示離線的緩存數據
   c.蘋果官方提供了一個叫Reachability的示例程序，便于開發者檢測網絡狀態
     https://developer.apple.com/library/ios/samplecode/Reachability/Reachability.zip
 
 2.Reachability的使用步驟
 1>添加框架SystemConfiguration.framework
 2>添加源代碼
 3>包含頭文件 - #import "Reachability.h"
 
 3.常見用法
 1>是否是WiFi
 + (BOOL)isEnableWiFi
 {
 return [[Reachability reachabilityForLocalWiFi] currentReachabilityStatus] !=NotReachable;
 }
 2>是否是3G
 + (BOOL)isEnable3G
 {
 return [[Reachability reachabilityForInternetConnection] currentReachabilityStatus] !=NotReachable;
 }
 */

- (void)viewDidLoad {
    [super viewDidLoad];
    
    //監聽網絡狀態發生改變通知
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(networkStateChange) name:kReachabilityChangedNotification object:nil];
    
    //獲得Reachability對象
    self.reachability = [Reachability reachabilityForInternetConnection];
    
    //開始監控
    [self.reachability startNotifier];
    
//    //獲取Reachability對象
//    Reachability *wifi = [Reachability reachabilityForLocalWiFi];
//    //獲取Reachability對象的當前網絡狀態
//    NetworkStatus wifiStatus = wifi.currentReachabilityStatus;
//    
//    if (wifiStatus !=NotReachable) {
//        NSLog(@"wifi");
//    }
    
}

- (void)networkStateChange
{
    NSLog(@"網絡狀態改變了");
    [self changeNetworkState];
}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    [self changeNetworkState];
}

- (void)changeNetworkState
{
    if ([BWNetWorkTool isEnableWiFi]) {
        NSLog(@"WiFi環境");
    }else if ([BWNetWorkTool isEnable3G]){
        NSLog(@"手機自帶網絡");
    }else{
        NSLog(@"沒有網絡");
    }
}

- (void)dealloc
{
    [self.reachability stopNotifier];
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

@end

?