TabsController transition sets alpha of views to 1.0

[andrewc94]

I'm using a control which has a set of invisible labels and set of visible labels. During my first transition to a view controller which contains this control, all the labels are visible when half should be invisible. I'm not sure what's causing this but using a UITabBarController does not have this problem.

• I'm using XCode 9.2, Material 2.13.4, Motion 1.3.3.
• Subsequent transitions don't set alphas to 1.0, just the first one
• possible related issues: isMotionEnabled is true, Set a button or other failure. #853, Views alpha reseting to 1 after view disappear. Motion#16
• What I'm seeing:

- What it should look like:

[daniel-jonathan]

Thank you for sharing this issue. I am going to investigate it tonight. In the meantime, if you have a sample project that reproduces the issue, that would be great.

[andrewc94]

Here you go, switch between the tabs to see the issue.
Test.zip

[daniel-jonathan]

Thank you! @andrewc94

[andrewc94]

Also not sure if this is helpful, but here's the stack trace where the label's alpha is set to 1 from 0 during the transition.

[daniel-jonathan]

Hey sorry for any delays with this issue. @adamdahan let's both take a look at this one.

[adamdahan]

@andrewc94 Stacktrace very useful thank you. Will look more into this tonight :)

[adamdahan]

@andrewc94

I have confirmed the issue in the latest version of Material and found the root cause of the issue with your help. I will confirm a fix with @DanielDahan and make sure this is addressed in the next release. The fix will address issues #853, CosmicMind/Motion#16 aswell.

Will keep this ticket open until it's fully resolved. Thank you for the test project and stacktrace 👍

[andrewc94]

@adamdahan
Thank you so much!! Would it be possible to give a high level explanation of what was going on?

[daniel-jonathan]

@adamdahan I fixed the alpha issue. We will make a push later today.

[daniel-jonathan]

@andrewc94 Thank you for sharing this issue, thank you @adamdahan for discovering the solution. The fix is in development and will be pushed later today.