实时监测每秒上行下行流量，一款 iOS Today Widget 监测器Demo，还可以可以监测内存大小、存储空间等信息

主要介绍每秒上行、下行流量，结尾有GitHub源码链接。

关于 Today Widget 的开发⬇️

先看效果图 ⬇️

这里介绍一下上行、下行流量的方法。

方法返回一个数组，分别为本月WIFI下的上行、下行总流量， WWAN下的上行、下行总流量，除以1024后单位是KB。

// 上行、下行流量
- (NSArray *)getDataCounters
{
    BOOL success;
    struct ifaddrs *addrs;
    struct ifaddrs *cursor;
    struct if_data *networkStatisc;
    long WiFiSent = 0;
    long WiFiReceived = 0;
    long WWANSent = 0;
    long WWANReceived = 0;
    NSString *name=[[NSString alloc]init];
    success = getifaddrs(&addrs) == 0;
    if (success)
    {
        cursor = addrs;
        while (cursor != NULL)
        {
            name=[NSString stringWithFormat:@"%s",cursor->ifa_name];
            //NSLog(@"ifa_name %s == %@\n", cursor->ifa_name,name);
            // names of interfaces: en0 is WiFi ,pdp_ip0 is WWAN
            if (cursor->ifa_addr->sa_family == AF_LINK)
            {
                if ([name hasPrefix:@"en"])
                {
                    networkStatisc = (struct if_data *) cursor->ifa_data;
                    WiFiSent+=networkStatisc->ifi_obytes;
                    WiFiReceived+=networkStatisc->ifi_ibytes;
                    //NSLog(@"WiFiSent %d ==%d",WiFiSent,networkStatisc->ifi_obytes);
                    //NSLog(@"WiFiReceived %d ==%d",WiFiReceived,networkStatisc->ifi_ibytes);
                }
                if ([name hasPrefix:@"pdp_ip"])
                {
                    networkStatisc = (struct if_data *) cursor->ifa_data;
                    WWANSent+=networkStatisc->ifi_obytes;
                    WWANReceived+=networkStatisc->ifi_ibytes;
                    //NSLog(@"WWANSent %d ==%d",WWANSent,networkStatisc->ifi_obytes);
                    //NSLog(@"WWANReceived %d ==%d",WWANReceived,networkStatisc->ifi_ibytes);
                }
            }
            cursor = cursor->ifa_next;
        }
        freeifaddrs(addrs);
    }
    return [NSArray arrayWithObjects:[NSNumber numberWithInt:WiFiSent/1024], [NSNumber numberWithInt:WiFiReceived/1024],[NSNumber numberWithInt:WWANSent/1024],[NSNumber numberWithInt:WWANReceived/1024], nil];
}

那么每秒的流量可以这样计算，先写一个定时器，用的 NSTimer，用 CADisplayLink 也可以。

NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:1.0f target:self selector:@selector(refreshV) userInfo:nil repeats:YES];
    self.timer = timer;

//    CADisplayLink* link = [CADisplayLink displayLinkWithTarget:self selector:@selector(refreshV)];

//    [link addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];

//    link.frameInterval = 60;

然后在每秒执行的方法里面，减去self.preWifi_S的值，再赋值self.preWifi_S，结果基本就是一秒的流量，注意判断WIFI与WWAN环境，还可以判断下数值大小，让单位变MB等，懒病发作没写。

- (void)refreshV {
    //    NSUserDefaults *userDefaults = [[NSUserDefaults alloc] initWithSuiteName:@"group.gsMonitorDemo"];
    //    float availableMemory = [userDefaults floatForKey:@"group.availableMemory"];
    
    // 内存、存储
    float availableMemory = [self availableMemory];
    self.menoryLab.text = [NSString stringWithFormat:@"%.0f MB", availableMemory];
    
    float allMemory = [self getTotalMemorySize];
    float memoryPre = (1-availableMemory/allMemory)*100;
    self.memoryPreLab.text = [NSString stringWithFormat:@"%.2f %%", memoryPre];
    if (self.flag) {
        self.guanGeView.value = memoryPre;
    }
    
    float availableDiskSize = [self getAvailableDiskSize];
    self.diskLab.text = [NSString stringWithFormat:@"%.2f GB", availableDiskSize / 1024.0];
    
    // 上行、下行流量
    Reachability *reachability = [Reachability reachabilityWithHostName:@"hha"];
    if (reachability.currentReachabilityStatus == ReachableViaWiFi) {
        float wifiS_preSecond = [[self getDataCounters][0] floatValue] - self.preWifi_S;
        float wifiR_preSecond = [[self getDataCounters][1] floatValue] - self.preWifi_R;
        self.topLiuLiang.text = [NSString stringWithFormat:@"%.0f KB/s", wifiS_preSecond];
        self.downLiuLiang.text = [NSString stringWithFormat:@"%.0f KB/s", wifiR_preSecond];
    }else if(reachability.currentReachabilityStatus == ReachableViaWWAN) {
        float wwanS_preSecond = [[self getDataCounters][2] floatValue] - self.preWWAN_S;
        float wwanR_preSecond = [[self getDataCounters][3] floatValue] - self.preWWAN_R;
        self.topLiuLiang.text = [NSString stringWithFormat:@"%.0f KB/s", wwanS_preSecond];
        self.downLiuLiang.text = [NSString stringWithFormat:@"%.0f KB/s", wwanR_preSecond];
    }else {
    }
    
    [self currentLiuLiang];
    
    float cpuUsage = [self cpu_usage];
    self.cpuLab.text = [NSString stringWithFormat:@"%.1f%%", cpuUsage];
}

// 赋值当前流量
- (void)currentLiuLiang {
    NSNumber *wifiSendNumber = [self getDataCounters][0];
    float wifiS = [wifiSendNumber floatValue];
    self.preWifi_S = wifiS;
    
    NSNumber *wifiReceived = [self getDataCounters][1];
    float wifiR = [wifiReceived floatValue];
    self.preWifi_R = wifiR;
    
    NSNumber *wwanSendNumber = [self getDataCounters][2];
    float wwanS = [wwanSendNumber floatValue];
    self.preWWAN_S = wwanS;
    
    NSNumber *wwanReceived = [self getDataCounters][3];
    float wwanR = [wwanReceived floatValue];
    self.preWWAN_R = wwanR;
}

右侧的表盘是用一个第三方用Quartz2D画出来的，具体可见代码。

https://github.com/alwaysDB/ZYDMonitor