title: progress bar showing tick animation instead of smooth animation when used with NSTimer
body: <p>I am using NSTimer and circular progress bar for the countdown timer i.e 15seconds </p>
  
  <p>Its working with the following code but I am getting tick animation for the progress bar and not the smooth one, how to make it smooth animation </p>
  
  <pre><code>- (void)viewDidLoad
          {
              [super viewDidLoad];
             self.labeledLargeProgressView.roundedCorners = NO;
              self.labeledLargeProgressView.trackTintColor =[UIColor colorWithRed:0.0f/255.0f       green:173.0f/255.0f blue:255.0f/255.0f alpha:1.0f];
              self.labeledLargeProgressView.progressTintColor =[UIColor colorWithRed:255.0f/255.0f    green:96.0f/255.0f blue:88.0f/255.0f alpha:1.0f];
              self.labeledLargeProgressView.thicknessRatio = 1.0f;
              self.labeledLargeProgressView.clockwiseProgress = YES;
              [self.view addSubview:self.labeledLargeProgressView];
              seconds = 15.0;
              [self startAnimation];
          }
  
  - (void)progressChange
  {
  
      CGFloat progress ;
      DALabeledCircularProgressView *labeledProgressView = self.labeledLargeProgressView;
      if(labeledProgressView.progress &gt;=1.0f &amp;&amp; [self.timer isValid]){
          [self stopAnimation];
           seconds = 15.0f;
      }
      else{
          progress=labeledProgressView.progress + 0.06666667f;
          [labeledProgressView setProgress:progress animated:YES];
          seconds --;
          labeledProgressView.progressLabel.text = [NSString stringWithFormat:@"%i", seconds];
      }
  
  
  }
  
  - (void)startAnimation
  {
      self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0
                                                    target:self
                                                  selector:@selector(progressChange)
                                                  userInfo:nil
                                                   repeats:YES];
      self.continuousSwitch.on = YES;
  }
  
  - (void)stopAnimation
  {
      [self.timer invalidate];
      self.timer = nil;
      self.continuousSwitch.on = NO;
  }
  </code></pre>