ios中判断当前手机的网络状态

typedef enum {
    NETWORK_TYPE_NONE= 0,
    NETWORK_TYPE_2G= 1,
    NETWORK_TYPE_3G= 2,
    NETWORK_TYPE_4G= 3,
    NETWORK_TYPE_5G= 4,//  5G目前为猜测结果
    NETWORK_TYPE_WIFI= 5,
    
}NETWORK_TYPE;

//方法可以声明成静态方法或者类方法，定义的枚举最好在.h文件中

+(NETWORK_TYPE)getNetworkTypeFromStatusBar {
    UIApplication *app = [UIApplication sharedApplication];
    NSArray *subviews = [[[app valueForKey:@”statusBar”] valueForKey:@”foregroundView”] subviews];
    NSNumber *dataNetworkItemView = nil;
    for (id subview in subviews) {

if([subview isKindOfClass:[NSClassFromString(@”UIStatusBarDataNetworkItemView”) class]])     {
            dataNetworkItemView = subview;
            break;
        }
        
    }
    
    NETWORK_TYPE nettype = NETWORK_TYPE_NONE;
    NSNumber * num = [dataNetworkItemView valueForKey:@”dataNetworkType”];
    nettype = [num intValue];
    return nettype;
}