Constraint-based Layout 约束版面布局
But more importantly, the label is positioned by passing its layout constraint to the parent.
但更为重要的是，该标签是通过将其布局约束传递给父元素来定位的。
This layout USES a Rectangle constraint to determine where to place the children figures.
该布局使用Rectangle约束来确定在何处放置子图形。
You need to add only a single constraint and you have a valid layout again.
你只需要再增加一个约束，就又产生一个有效布局。
应用推荐