iOS how to make slider stop at discrete points

Question

I would like to make a slider stop at discrete points that represent integers on a timeline. What\'s the best way to do this? I don\'t want any values in between. It woul

Answer 1

I did as Nathan suggested, but I also want to update an associated UILabel displaying the current value in real time, so here is what I did:

- (IBAction) countdownSliderChanged:(id)sender
{
    // Action Hooked to 'Value Changed' (continuous)

    // Update label (to rounded value)

    CGFloat value = [_countdownSlider value];

    CGFloat roundValue = roundf(value);

    [_countdownLabel setText:[NSString stringWithFormat:@" %2.0f 秒", roundValue]];
}


- (IBAction) countdownSliderFinishedEditing:(id)sender
{
    // Action Hooked to 'Touch Up Inside' (when user releases knob)

    // Adjust knob (to rounded value)

    CGFloat value = [_countdownSlider value];

    CGFloat roundValue = roundf(value);

    if (value != roundValue) {
        // Almost 100% of the time - Adjust:

        [_countdownSlider setValue:roundValue];
    }
}

The drawback, of course, is that it takes two actions (methods) per slider.