UISlider is flickering - ios

Question

we are using UISlider in our project, we are using that older in order to play audio.for specific audio, when we are playing that, UISlider is flickering for first 13 seconds. for another audio, that UISlider is flickering for first 8 seconds. what can be the solution for this? Thanks in advance.
I have assigned right value to the slider.
- (void)setSliderValue
{
if(self.jwAudioPlayer == nil)
return;
if(self.slider && self.slider.maximumValue == 1.0)
{
self.slider.minimumValue = 0.0;
self.slider.maximumValue = self.jwAudioPlayer.duration;
self.slider.value = 0;
}
}
- (void)setPlayerCurrentPlayingTime
{
if(self.jwAudioPlayer == nil)
return;
if(self.slider.maximumValue <= 0 && self.jwAudioPlayer.duration > 0){
self.slider.maximumValue = self.jwAudioPlayer.duration;
}
CGFloat durationInSeconds = self.jwAudioPlayer.duration;
CGFloat currentTimeInSeconds = self.jwAudioPlayer.position;
if(currentTimeInSeconds >= durationInSeconds)
{
currentTimeInSeconds = durationInSeconds;
[self pause];
}
if(self.durationTime)
{
self.durationTime.text = [self timeFormatted:durationInSeconds];
}
if(self.currentPlayingTime)
{
self.currentPlayingTime.text = [self timeFormatted:currentTimeInSeconds];
}
if(self.slider && self.slider.tag == 0)
{
[self setSliderValue];
[self.slider setValue:currentTimeInSeconds animated:YES];
}
if(self.playerController)
[self.playerController enableDisableSkipImage:currentTimeInSeconds];