Change text color based on background color (e.g. in a progress bar)

Asked Sep 20 '16 at 10:45

Active Sep 20 '16 at 10:45

Viewed 888 times

I find it difficult to describe what I want to achieve. I looked for a picture to show:

(image link: https://d13yacurqjgara.cloudfront.net/users/7017/screenshots/351285/button.gif)

You see that the text color of "3/4" changes to white when the bar reaches it. How can I achieve this with swift?

My idea is to have two UIViews, with the exact same content (except for the text color) and blend one over the other by resizing a mask or something. The problem is that I would have to deal with duplicate content. If I wanted to change something, I would have to change it inside both views. Is there a more convenient way?

Thank you!

asked Sep 20 '16 at 10:45

SwiftedMind

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tried this ? http://stackoverflow.com/questions/15538163/inverse-uilabel-text-color-when-its-frame-intersects-an-uiview – Umair Afzal Sep 20 '16 at 10:49
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and this ? http://stackoverflow.com/questions/24275603/uilabel-over-uiprogressview-with-multiple-colors – Umair Afzal Sep 20 '16 at 10:49
Wow, I googled nearly the same, except for the "intersect" part. I didn't find this. Thank you! – SwiftedMind Sep 20 '16 at 10:51
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my pleasure :-) happy coding – Umair Afzal Sep 20 '16 at 10:53
@UmairAfzal can we find the same for javascript – developer Mar 30 '22 at 12:05

Change text color based on background color (e.g. in a progress bar)

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