I am using Xcode 9.4 and I am getting:

"file:///Users/shane/data/src/vssl/vssl_ios/VSSL/Base.lproj/Main.storyboard: error: IB Designables: Failed to render and update auto layout status for AdvancedEqViewController (GAS-CK-jHf): dlopen(VerticalSlider.framework, 1): no suitable image found. Did find: VerticalSlider.framework: required code signature missing for 'VerticalSlider.framework'"

when using multiple VerticalSlider and hooking them all to a single IBAction method, the attempt to identify the sender using tag or isEqual will fail.

The reason is that the sender is not the VerticalSlider instance but the internal UISlider, please fix it.

    fileprivate func updateSlider() {
        if !ascending {
//            slider.transform = CGAffineTransform(rotationAngle: CGFloat(M_PI) * -0.5)
            slider.transform = CGAffineTransform(rotationAngle: CGFloat(Double.pi) * -0.5)
        } else {
//            slider.transform = CGAffineTransform(rotationAngle: CGFloat(M_PI) * 0.5).scaledBy(x: 1, y: -1)
            slider.transform = CGAffineTransform(rotationAngle: CGFloat(Double.pi) * 0.5).scaledBy(x: 1, y: -1)
        }
        
        slider.minimumValue = minimumValue
        slider.maximumValue = maximumValue
        slider.value = value
        slider.thumbTintColor = thumbTintColor
        slider.minimumTrackTintColor = minimumTrackTintColor
        slider.maximumTrackTintColor = maximumTrackTintColor
        slider.isContinuous = isContinuous
    }

Thank you for your interest in VerticalSlider!

I have received a surprising amount of questions about VerticalSlider since putting it up here. A few people in the community have identified some problems and helped contribute to VerticalSlider to make it better for everyone and I'm truly grateful for the support! Keep them coming!

I have also received a number of questions about people having issues implementing VerticalSlider, mostly from beginners learning how to code. As much as I would love to help all of you, I simply do not have the time to teach you. That's why I spent a lot of time putting together a detailed README, adding comments about usage in code, and providing a demo project. These will give you all the information you need to work through any problem and also save me the time it takes to personally respond. It is faster for you to figure it out for yourself instead of waiting for me to respond to you.

If your question starts with "How do I...", that's not a bug. Stay persistent, try a few different things, and you will figure it out! I also recommend searching and posting your questions on stackoverflow.com. Or, if you're interested in hiring me to teach you, please email me using the email address listed at the bottom of my README.

Again, please do not email me or open any issues if you want to know how to use VerticalSlider or are having trouble getting it to work. However, if you think you found a bug, please open an issue and I will respond to it as quickly as I can. Ideally, you can demonstrate the bug in the demo project which has a minimal amount of code.

Thanks again for your support and for being respectful of my time.

Thanks for this nice class. Do you have any idea how to make the thumb images shadow also appear below the thumb image as it does on the horizontal version of the UISlider?