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Align UISlider thumb image - objective-c

Image
By User



I've customized my UISlider but my thumb image looks strange, I mean it's position not aligned by center:





enter image description here





But should be like this:





enter image description here





And here is code:







UIImage *leftTrack = [[UIImage imageNamed:@"blueTrack.png"] stretchableImageWithLeftCapWidth:3 topCapHeight:0];

UIImage *rightTrack = [[UIImage imageNamed:@"whiteTrack.png"] stretchableImageWithLeftCapWidth:3 topCapHeight:0];

[slider setThumbImage:[UIImage imageNamed:@"thumbButton.png"] forState:UIControlStateNormal];

[slider setMinimumTrackImage:leftTrack forState:UIControlStateNormal];

[slider setMaximumTrackImage:rightTrack forState:UIControlStateNormal];







Where could be the problem?





EDIT: I found solution of this problem. Thumb image background was transparent, and I've not seen that thumb image was not aligned by center:





enter image description here


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