獲取網絡狀態，區分2G3G4GWIFI等，非reachability

前言：
轉載自：http://www.cocoachina.com/bbs/read.php?tid=227757

+(NSString *)getNetWorkStates{
    UIApplication *app = [UIApplication sharedApplication];
    NSArray *children = [[[app valueForKeyPath:@"statusBar"]valueForKeyPath:@"foregroundView"]subviews];
    NSString *state = [[NSString alloc]init];
    int netType = 0;
    //獲取到網絡返回碼
    for (id child in children) {
        if ([child isKindOfClass:NSClassFromString(@"UIStatusBarDataNetworkItemView")]) {
            //獲取到狀態欄
            netType = [[child valueForKeyPath:@"dataNetworkType"]intValue];

            switch (netType) {
                case 0:
                    state = @"無網絡";
                    //無網模式
                    break;
                case 1:
                    state = @"2G";
                    break;
                case 2:
                    state = @"3G";
                    break;
                case 3:
                    state = @"4G";
                    break;
                case 5:
                {
                    state = @"WIFI";
                }
                    break;
                default:
                    break;
            }
        }
    }
    //根據狀態選擇
    return state;
}

根據狀態欄獲取網絡狀態，可以區分2G、3G、4G、WIFI，系統的方法，比較快捷。稍微蛋疼的是萬一連接的WIFI沒有聯網的話···你懂得