在Design界面直接拖放控件的时候，提示AS- This view is not constrained vertically. At runtime it will jump to the left/(0,0) unless you

 

AS- This view is not constrained vertically. At runtime it will jump to the left/(0,0) unless you add constraint.

 

呐，design 拖拽按钮呀文字框过去的时候，text状态会出现的红色警告，说没有添加约束，运行时会跳到(0,0)左上角位置喔

 

然后呢，design状态下拖过去之后呢，在这小道具右键，Constraint(约束)  Layout->Infer Constraints,点一下，就ok啦~