UIProgressView not animating progress on iOS 13

Question

I am not seeing the animation of a UIProgressView with Xcode 11.0/Swift 5/iOS 13:

private let timerProgressView: UIProgressView = {
    let timerProgressView = UIProgressView()
    timerProgressView.progressTintColor = white
    timerProgressView.trackTintColor = .black
    timerProgressView.setProgress(1.0, animated: false)
    return timerProgressView
}()

private func triggerProgressView() {
    UIView.animate(withDuration: viewModel.timeLimit, delay: 0.0, options: .curveLinear, animations: { [weak self] in
        self?.timerProgressView.setProgress(0.0, animated: true)
    }, completion: nil)
}

This code works on iOS <12 but not on iOS 13. Am I missing something?

Thanks, but this is ridiculous, I abandoned the ProgressView for a sensible alternative, feel free to take a look https://github.com/ueen/SensibleProgressView :) — ueen, Sep 23 '19 at 20:54

score 5 · Accepted Answer · answered Sep 23 '19 at 13:58

we've faced it too and after about an hour of hair pulling we came up with a workaround, it looks like that is a bug. it ridiculous, but setting the progress to 0.0001 instead of 0.0 will do the job.

progressView.progress = 0.0001
UIView.animate(withDuration: duration,
                   delay: 0.0, options: [.curveLinear, .beginFromCurrentState, .preferredFramesPerSecond60],
                   animations: { progressView.layoutIfNeeded() },
                   completion: nil)

score 1 · Answer 2 · answered Sep 18 '19 at 07:11

Did you try doing something like this? :

self?.timerProgressView.setProgress(0.0) 
UIView.animate(withDuration: viewModel.timeLimit, delay: 0.0, options: .curveLinear, animations: { [weak self] in
    self?.timerProgressView.layoutIfNeeded() 
}, completion: nil)

UIProgressView not animating progress on iOS 13

2 Answers2