UISlider behaviour in iOS7 versus iOS6

Question

I noticed that UISlider in iOS7 behaves differently than it did in iOS 6 and iOS 5:

Say you have a slider with min=0 and max=10, current value is 0. When you first t

Answer 1

On iOS 9 you need to set for .Normal, .Selected and .Highlighted states to work. I found this after 5h of struggling. Way to go Apple!

[_sliderView setThumbImage:[UIImage imageNamed:@"knob"] forState:UIControlStateNormal];
[_sliderView setThumbImage:[UIImage imageNamed:@"knob"] forState:UIControlStateSelected];
[_sliderView setThumbImage:[UIImage imageNamed:@"knob"] forState:UIControlStateHighlighted];