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
WIFI3G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
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<code class="hljs ruleslanguage">#import "Reachability.h"</code> |
抽取工具类
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<code class="hljs objectivec">常见用法// 是否WIFI+ (BOOL) IsEnableWIFI { return ([[Reachability reachabilityForLocalWiFi] currentReachabilityStatus] != NotReachable);}// 是否3G+ (BOOL) IsEnable3G { return ([[Reachability reachabilityForInternetConnectionen] currentReachabilityStatus] != NotReachable);}</code> |
网络监控
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<code class="hljs objectivec">[[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];}</code> |
检测网络状态实例
NetWorkTool工具类
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<code class="hljs java">#import <foundation foundation.h="">@interface NetworkTool : NSObject/** * 是否WIFI */+ (BOOL)isEnableWIFI;/** * 是否3G */+ (BOOL)isEnable3G;@end</foundation></code> |
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<code class="hljs objectivec">#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</code> |
实现类
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<code class="hljs objectivec">#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];}</code> |
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<code class="hljs objectivec">#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]; } |