关于iOS 7 故事板布局适配

Question

我界面用storyboard 的autolayout+sizeclass+纯代码布局，在ios9能很好地显示，用ios7.1的ipad就完全走样了，请问是神马原因

Answer 1

Is it just a pad for ios7.1? Will other versions of ios7.1 work normally? After all, some automatic layout attributes such as margin do not support ios7.