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.
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.
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