I wanted to keep the mask image gray but the filling should be with the gradient pattern

[vicky1787]

I wanted to keep the mask image gray but the filling should be with the gradient pattern.

Can you achieve or guide how to customise.

I Tried this but didn't work :(
[_progressViewSlider setBackColor:[UIColor colorWithPatternImage:[UIImage imageNamed:@"contact_sync_color"]]];