Making UIProgressView Rounded corners

Question

I have created a UIProgressView with following properties

progressView.progressTintColor = UIColor.appChallengeColorWithAlpha(1.0)
progressView.trackTintColor = UIColor.clearColor()
progressView.clipsToBounds = true
progressView.layer.cornerRadius = 5

I am using a UIView for border. It appears like his progress = 1, which is exactly the way I want.

But if progress value is less then 1. Corners are not rounded as it should be.

Am I missing something ? How can I make it rounded corner ?

Answer 1

UIProgressView has two part, progress part and track part. If you use Reveal, you can see it only has two subviews. The progress view hierarchy is very simple. so...

Objective-C

- (void)layoutSubviews
{
    [super layoutSubviews];
    [self.progressView.subviews enumerateObjectsUsingBlock:^(__kindof UIView * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        obj.layer.masksToBounds = YES;
        obj.layer.cornerRadius = kProgressViewHeight / 2.0;
    }];
}

Swift (3, 4 and 5+)

override func layoutSubviews() {
    super.layoutSubviews()
    subviews.forEach { subview in
        subview.layer.masksToBounds = true
        subview.layer.cornerRadius = kProgressViewHeight / 2.0
    }
}

I admit subclass or extend progressView is the recommended way. In case of you don't want to do that for such a simple effect, this may do the trick. Keep the situation that Apple will change the view hierarchy, and something may go wrong in mind.