Tab bar shows unwanted white top space

Question

Hi there I'm using storyboard only to design the main scene. The problem I'm trying to deal with is little white space on top of my Tabbar . Here is screenshot how it looks like

Any help how can I remove that?

Notice that I have set the bottom constraint to zero by auto layout as shown in following picture

bottom constraint for last object in the scene

Answer 1

You might want to take another look at your constraints. Consider using "Add missing constraints"

Answer 2

在单击添加约束之前，请尝试取消选中constrain to margins约束。