Navigation bar background animates from CGRectZero to its proper size when the barTintColor is nil.

Originator:cuva
Number:rdar://27367299 Date Originated:15-Jul-2016 04:52 PM
Status:Open Resolved:
Product:iOS Product Version:9.3
Classification:UI/Usability Reproducible:Always
 
When animating the barTintColor of UINavigationBar from nil to a non-nil value, the animation starts from CGRectZero instead of beginning from its actual size.

Steps: 
  1. Open sample project.
  2. Click on the button that animates the navigation bar colour.
  3. See the unexpected navigation bar transition.

Expected Results:

It should transition smoothly from transparent to a solid colour, just like it does between two colours.

Actual Results:

The colour animates in but the size of the navigation bar is initially CGSizeZero resulting in a weird animation instead of a smooth crossfade.

Comments


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