Increment UISlider by 1 in range 1 to 100

//Only generate update events on release
slider.continuous = NO;

//Round the value and set the slider
- (IBAction)sliderChange:(id)sender
{
    int rounded = sender.value;  //Casting to an int will truncate, round down
    [sender setValue:rounded animated:NO];

    NSLog(@"%f", sender.value);
}

you could try this:

float RoundValue(UISlider * slider) {
  return roundf(slider.value * 2.0) * 1;
}