iOS 获取网络状态

在iOS开发者，获取网络状态比较常用

-(NSString *)getNetWorkStates{

    UIApplication *app = [UIApplication sharedApplication];
    NSArray *children = [[[app valueForKeyPath:@"statusBar"]valueForKeyPath:@"foregroundView"]subviews];
    NSString *state = nil;
    int netType = ;
    //获取到网络返回码
    for (id child in children) {
        if ([child isKindOfClass:NSClassFromString(@"UIStatusBarDataNetworkItemView")]) {
            //获取到状态栏
            netType = [[child valueForKeyPath:@"dataNetworkType"]intValue];

            switch (netType) {
                case :
                    state = @"无网络";
                    //无网模式
                    break;
                case :
                    state = @"2G";
                    break;
                case :
                    state = @"3G";
                    break;
                case :
                    state = @"4G";
                    break;
                case :
                {
                    state = @"WIFI";
                }
                    break;
                default:
                    break;
            }
        }
    }
    //根据状态选择
    return state;
}