How to interface this no nc c switch with arduino

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I tried other code to control servo sweep without delay and a led with a switch but when i click the switch the led turns on only when the servo is rotating.. any help ?

#include <Servo.h> 
int buttonState = 0;

class Sweeper
{
 Servo servo;              // the servo
 int pos;              // current servo position 
 int increment;        // increment to move for each interval
 int  updateInterval;      // interval between updates
 unsigned long lastUpdate; // last update of position

public: 
 Sweeper(int interval)
 {
   updateInterval = interval;
   increment = 1;
 }
 
 void Attach(int pin)
 {
   servo.attach(pin);
 }
 
 void Detach()
 {
   servo.detach();
 }
 
 void Update()
 {
   if((millis() - lastUpdate) > updateInterval)  // time to update
   {
     lastUpdate = millis();
     pos += increment;
     servo.write(pos);
     Serial.println(pos);
     if ((pos >= 180) || (pos <= 0)) // end of sweep
     {
      delay(5000);
       // reverse direction
       increment = -increment;
     }
   }
 }
};




Sweeper sweeper1(20);

void setup() 
{ 
 Serial.begin(9600);
 sweeper1.Attach(9);
   pinMode(7, INPUT_PULLUP);
  pinMode(12, OUTPUT);
} 


void loop() 
{ 
 sweeper1.Update();
   buttonState = digitalRead(7);
  if (buttonState == HIGH) {
      digitalWrite(12, HIGH);
 
  } else {
    digitalWrite(12, LOW);
  }
 
}