IOS8 UILabel BUG? Text does not display

A previous project, found today there is a place in the iOS8 above the text is not displayed, with the Uilabel

So debugging a bit of code, the reason is roughly found:

When adding a subview with the same uilabel on a uilabel, if the parent label is set to the background color (setbackgroundcolor:) but not the text (setText:), Then the text of the child label setting does not show, it is really a strange problem.

Here are 3 solutions:

1. Change the parent label to UIView

2, do not set the background color of the parent lable

3. Set the text of the parent label ([Superlabel settext:@ "])

As to whether this is a iOS8 bug, it is unclear.

IOS8 UILabel BUG? Text does not display