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Using UISlider as UISwitch (Two state object)
UISlider *slider;
[UIView animateWithDuration:0.2 // seconds
                 animations:^{
                   slider.value = (YES) ? 1.0 : 0.0; // modify this line as appropriate
                 }];

UISlider* slider = [[UISlider alloc] init];
slider.minimumValue = -3.0f;
slider.maximumValue = 3.0f;

-(IBAction)valueChanged:(id)sender {
    // This determines which "step" the slider should be on. Here we're taking
    //   the current position of the slider and dividing by the `self.stepValue`
    //   to determine approximately which step we are on. Then we round to get to
    //   find which step we are closest to.
    float newStep = roundf((questionSlider.value) / self.stepValue);

    // Convert "steps" back to the context of the sliders values.
    self.questionSlider.value = newStep * self.stepValue;
}