第一个布局约束了视图的开始边界，它对照父视图的开始边界而设置。

The first layout constrains the view's leading edge relative to its superview's leading edge.

youdao

第一个布局约束了视图的开始边界，它对照父视图的开始边界而设置。

The first layout constrains the view's leading edge relative to its superview's leading edge.

youdao