Offset UISlider Min/Max value images

I'm trying to offset the x/y position of a UISlider's min and max value images. Currently, I'm sublcassing UISlider and am setting the maximum value image like this:

[self setMaximumValueImage:[UIImage imageNamed:@"circle_with_plus"]];

However, I need this image to be closer to the actual UISlider 开发者_JS百科and have little control over visual assets on this project. I've tried using

- (CGRect)maximumValueImageRectForBounds:(CGRect)bounds

However, I'm my min/max value images may change size dynamically so I'm not sure how to properly implement it in this case. Is there a different way to move the asset? Thanks

No, there is no other way to reposition the minimum or maximum value images. maximumValueImageRectForBounds: gets invoked every time the slider lays out its subviews, and laying out the subviews happens whenever you change the maximumValueImage, so it is sufficient to do:

@implementation MyCustomSlider

- (CGRect)maximumValueImageRectForBounds:(CGRect)bounds {
  CGRect r = [super maximumValueImageRectForBounds:bounds];
  r.origin.x -= 3;
  return r;
}

@end