code like below...
[progressView setMaximumTrackImage:[UIImage imageNamed:@"yourimage"] forState:UIControlStateNormal];
[progressView setMinimumTrackImage:[UIImage imageNamed:@"yourimage"] forState:UIControlStateNormal];
[progressView setThumbImage:[UIImage imageNamed:@"yourimage"] forState:UIControlStateNormal];
//intial progress
progressview.progress=0.0;
Increase your progress
progressview.progress=progress here;
let me know it is working or not!!!!
Happy Coding!!!