Doc of CALayer.contentsScale is incorrect

Originator:an00na
Number:rdar://22595655 Date Originated:06-Sep-2015 11:08 AM
Status:Open Resolved:
Product:Documentation Product Version:
Classification:Other Bug Reproducible:Not Applicable
 
Summary:
“For layers attached to a view, the view changes the scale factor automatically to a value that is appropriate for the current screen.”

It means on 2x screen UIView.layer.contentsScale should bet set to 2.0 by view system automatically. However, it is not true for UIView with custom layer class — it is 1.0. It only becomes 2.0 if UIView’s drawRect(:) is overridden.

Steps to Reproduce:
1. Launch sample app.
2. Read console logs.
3. Uncomment line 23 of View.swift.
4 Repeat 1~2 to see the correct result.

Sample code:
http://cl.ly/3V2x2y1O1M29

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