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- (void) sliderChanged: (UISlider *) sender
{
    // Fade the text as the slider moves to the right. This code makes the
    // text totally dissapear when the slider is 35% of the way to the right.
    label.alpha = MAX(0.0, 1.0 - (slider.value * 3.5));

    // Stop the animation if the slider moved off the zero point
    if (slider.value != 0) {
        [self stopTimer];
        [label.layer setNeedsDisplay];
    }
}

// Fade the text as the slider moves to the right. This code makes the
// text totally dissapear when the slider is 35% of the way to the right.
label.alpha = MAX(0.0, 1.0 - (slider.value * 3.5));

label.alpha = MAX(0.0, 1.0 - (slider.value / 0.35));