title: Thumb image does not move to the edge of UISlider
body: <p>Thumb image does not move to the edge even when it's value is max or min.</p>
  
  <p>Does anyone know how to make it move all the way to the edge of the slider?</p>
  
  <p><img src="https://i.stack.imgur.com/TBP5l.png" alt="enter image description here"></p>
  
  <pre><code>@interface ViewController ()
  @property (weak, nonatomic) IBOutlet UISlider *slider;
  @end
  
  @implementation ViewController
  - (void)viewDidAppear:(BOOL)animated
  {
  [super viewDidAppear:animated];
  UIImage* sliderBarMinImage = [[UIImage imageNamed:@"slider_bar_3_min"] stretchableImageWithLeftCapWidth:8.0 topCapHeight:0.0];
  UIImage* sliderBarImage = [[UIImage imageNamed:@"slider_bar_3_max"] stretchableImageWithLeftCapWidth:8.0 topCapHeight:0.0];
  UIImage* sliderThumbImage= [[UIImage imageNamed:@"slider_thumb_3"] stretchableImageWithLeftCapWidth:8.0 topCapHeight:0.0];
  
  [self.slider setMinimumTrackImage:sliderBarMinImage forState:UIControlStateNormal];
  [self.slider setMaximumTrackImage:sliderBarImage forState:UIControlStateNormal];
  [self.slider setThumbImage:sliderThumbImage forState:UIControlStateNormal];
  }
  @end
  </code></pre>