在Design界面直接拖放控件的時候，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.

 

吶，design 拖拽按鈕呀文字框過去的時候，text狀態會出現的紅色警告，說沒有添加約束，運行時會跳到(0,0)左上角位置喔

 

然后呢，design狀態下拖過去之后呢，在這小道具右鍵，Constraint(約束)  Layout->Infer Constraints,點一下，就ok啦~