Change iPhone UISlider bar image

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You were right to use -setMinimumTrackImage:forState: and -setMaximumTrackImage:forState: methods. What you missed is that you should provide stretchable UIImage to them, the rest is taken care of automagically:

UIImage *sliderLeftTrackImage = [[UIImage imageNamed: @"SliderMin.png"] stretchableImageWithLeftCapWidth: 9 topCapHeight: 0];
UIImage *sliderRightTrackImage = [[UIImage imageNamed: @"SliderMax.png"] stretchableImageWithLeftCapWidth: 9 topCapHeight: 0];
[mySlider setMinimumTrackImage: sliderLeftTrackImage forState: UIControlStateNormal];
[mySlider setMaximumTrackImage: sliderRightTrackImage forState: UIControlStateNormal];

You can use the same image for both the min and max parts.

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