iOS auto-layout problem

Today to make a little footerview my heart almost gas out ...

The first step creates a new view Xib file

The second step is to create a new UIView class

The third step is to put a lable in the middle of the UIView, add the constraint, horizontal vertical Center

The fourth step instantiates the UIView and assigns it to the TableView Footerview

Then the question came, and I found the lable not show in the vertical screen ... Normal under Horizontal screen

And then I thought, "Is this footerview not scaled, set to scaled

Footerview.contentmode=uiviewcontentmodescaletofill ... Useless

Value before and after assignment the width of the custom view, 320 Ah, it hasn't changed.

Then a variety of search information ... No fruit, ask no one in the group met ... I wipe, no one brought the little brother is poor Ah

Go on, think about what you did wrong.

Is it related to the opening of the compact width and any width? I'm a little out of my mind. Compact width ...

Check Information

Http://www.cnblogs.com/zhw511006/p/3998534.html

Originally, different views are not the same device supported ...

Set to any width

Finally came out, brain ...

iOS auto-layout problem