iOS開發 - 檢測網路狀態(WIFI、2G/3G/4G)

iOS開發 - 檢測網路狀態(WIFI、2G/3G/4G)
檢測網路狀態

在網路應用中，需要對使用者裝置的網路狀態進行即時監控，目的是
讓使用者瞭解自己的網路狀態，防止一些誤會（比如怪應用無能）
根據使用者的網路狀態進行智能處理，節省使用者流量，提高使用者體驗
WIFI\3G網路：自動下載高清圖片
低速網路：只下載縮圖
沒有網路：只顯示離線的快取資料

蘋果官方提供了一個叫Reachability的樣本程式，便於開發人員檢測網路狀態
https://developer.apple.com/library/ios/samplecode/Reachability/Reachability.zip

Reachability的使用步驟
添加架構SystemConfiguration.framework

添加原始碼

包含標頭檔

#import "Reachability.h"

抽取工具類

常見用法// 是否WIFI+ (BOOL) IsEnableWIFI {    return ([[Reachability reachabilityForLocalWiFi] currentReachabilityStatus] != NotReachable);}// 是否3G+ (BOOL) IsEnable3G {    return ([[Reachability reachabilityForInternetConnectionen] currentReachabilityStatus] != NotReachable);}

網路監控

[[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];}

檢測網路狀態執行個體

NetWorkTool工具類

#import @interface NetworkTool : NSObject/** *  是否WIFI */+ (BOOL)isEnableWIFI;/** *  是否3G */+ (BOOL)isEnable3G;@end

#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

實作類別

#import "ViewController.h"#import "Reachability.h"#import "NetworkTool.h"@interface ViewController ()@property (nonatomic, strong) Reachability *reachability;@end@implementation ViewController- (void)viewDidLoad{    [super viewDidLoad];    // 監聽網路狀態發生改變的通知    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(networkStateChange) name:kReachabilityChangedNotification object:nil];    // 獲得Reachability對象    self.reachability = [Reachability reachabilityForInternetConnection];    // 開始監控網路    [self.reachability startNotifier];}- (void)dealloc{    [self.reachability stopNotifier];    [[NSNotificationCenter defaultCenter] removeObserver:self];}- (void)networkStateChange{    NSLog(@"網路狀態改變了");    [self checkNetworkState];}- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{    [self checkNetworkState];}

#pragma mark - App應用程式網路類型改變就會調用- (void)networkStateChange{    if ([NetWorkTool isEnableWIFI]) {        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"溫馨提示您" message:@"您現在網路環境為wifi！開始暢享吧！" delegate:self cancelButtonTitle:@"確定" otherButtonTitles:nil, nil];        [alert show];    } else if ([NetWorkTool isEnable3G]) {        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"溫馨提示您"  message:@"您現在網路環境為3G/4G網路！" delegate:self cancelButtonTitle:@"確定" otherButtonTitles:nil, nil];        [alert show];    } else {        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"溫馨提示您" message:@"您當前沒有可連的網路或已經掉線！" delegate:self cancelButtonTitle:@"確定" otherButtonTitles:nil, nil];        [alert show];    }}