第三个布局约束了视图相对于其父视图的开始边界。
The third layout constrains the view's leading edge relative to its superview's leading edge.
第二个布局约束了视图相对于它的父视图的开始边界。
The second layout constrains the view's leading edge relative to its superview's leading edge.
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。
But more importantly, the label is positioned by passing its layout constraint to the parent.
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