本文转载至 http://blog.csdn.net/wangzi11322/article/details/45580917
检测网络状态
在网络应用中，需要对用户设备的网络状态进行实时监控，目的是
让用户了解自己的网络状态，防止一些误会（比如怪应用无能）
根据用户的网络状态进行智能处理，节省用户流量，提高用户体验
WIFI\3G网络：自动下载高清图片
低速网络：只下载缩略图
没有网络：只显示离线的缓存数据
苹果官方提供了一个叫Reachability的示例程序，便于开发者检测网络状态
https://developer.apple.com/library/ios/samplecode/Reachability/Reachability.zip
Reachability的使用步骤
添加框架SystemConfiguration.framework 
添加源代码 
包含头文件
#import "Reachability.h"- 1
抽取工具类
常见用法
// 是否WIFI
+ (BOOL) IsEnableWIFI {
return ([[Reachability reachabilityForLocalWiFi] currentReachabilityStatus] != NotReachable);
}// 是否3G
+ (BOOL) IsEnable3G {
return ([[Reachability reachabilityForInternetConnectionen] currentReachabilityStatus] != NotReachable);
}
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网络监控
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(reachabilityChanged:) name: kReachabilityChangedNotification object: nil];
self.netReachability = [Reachability reachabilityForInternetConnection];
[self.netReachability startNotifier];- (void)dealloc
{
[self.netReachability stopNotifier];
[[NSNotificationCenter defaultCenter] removeObserver:self name:kReachabilityChangedNotification object:nil];
}
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检测网络状态实例
NetWorkTool工具类
#import <Foundation/Foundation.h>@interface NetworkTool : NSObject
/**
* 是否WIFI
*/
+ (BOOL)isEnableWIFI;/**
* 是否3G
*/
+ (BOOL)isEnable3G;
@end
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#import "NetWorkTool.h"
#import "Reachability.h"@implementation NetworkTool
// 是否WIFI
+ (BOOL)isEnableWIFI {
return ([[Reachability reachabilityForLocalWiFi] currentReachabilityStatus] != NotReachable);
}// 是否3G
+ (BOOL)isEnable3G {
return ([[Reachability reachabilityForInternetConnection] currentReachabilityStatus] != NotReachable);
}
@end- 1
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实现类
#import "ViewController.h"
#import "Reachability.h"
#import "NetworkTool.h"@interface ViewController ()
@property (nonatomic, strong) Reachability *reachability;
@end@implementation ViewController- (void)viewDidLoad
{
[super viewDidLoad]; // 监听网络状态发生改变的通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(networkStateChange) name:kReachabilityChangedNotification object:nil]; // 获得Reachability对象
self.reachability = [Reachability reachabilityForInternetConnection];
// 开始监控网络
[self.reachability startNotifier];}- (void)dealloc
{
[self.reachability stopNotifier];
[[NSNotificationCenter defaultCenter] removeObserver:self];
}- (void)networkStateChange
{
NSLog(@"网络状态改变了");
[self checkNetworkState];
}- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[self checkNetworkState];
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#pragma mark - App应用程序网络类型改变就会调用
- (void)networkStateChange
{
if ([NetWorkTool isEnableWIFI]) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"温馨提示您" message:@"您现在网络环境为wifi！开始畅享吧！" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
[alert show];
} else if ([NetWorkTool isEnable3G]) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"温馨提示您" message:@"您现在网络环境为3G/4G网络！" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
[alert show];
} else {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"温馨提示您" message:@"您当前没有可连的网络或已经掉线！" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
[alert show];
}
}
