自定义UISlider ios - Touch无效

Question

我使用PanAesture为我的音频播放器使用AVAudioPlayer制作了自定义滑块。我使用NSTimer来跟踪我的音频的当前时间，在这种情况下，某些时候触摸无法移动Slider。它变得不可拖拽了。之后，如果我尝试或更多时间移动，那么它也可以很好地工作。

编辑：

-(void)setData{
    minPoint=totalSeekBar.frame.origin;
    maxPoint=CGPointMake(totalSeekBar.frame.size.width+minPoint.x, minPoint.y);
    knob.userInteractionEnabled=YES;
    UIPanGestureRecognizer *panGesture=[[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(knobPanned:)];
    [knob addGestureRecognizer:panGesture];
    [self setSliderForPosition:_currentPosition WithAnimation:YES];


}

-(void)setSliderForPosition:(CGFloat)position WithAnimation:(BOOL)shouldAnimate{
    CGFloat totalWidth=totalSeekBar.frame.size.width+totalSeekBar.frame.origin.x;

    if(position<_maxValue){
        CGFloat newX=(position*totalWidth)/_maxValue;
        [self setKnobToPoint:CGPointMake(newX,0) animated:shouldAnimate delegateCall:NO];

    }


}

-(void)knobPanned:(UIPanGestureRecognizer*)sender{
    [_delegate sliderIsMoving];
    _isUpdating=YES;
    [self setKnobToPoint:[sender locationInView:self] animated:NO delegateCall:YES];

    if(sender.state==UIGestureRecognizerStateEnded){
        _currentPosition=[self getNewCurrentValueForPoint:[sender locationInView:self]];
        [_delegate sliderDidEndMoving];
    }
    _isUpdating=NO;
 }