刚遇到了这个问题，详细信息如下：
Assertion failure in -[MASViewConstraint install], /Users/***/.../Pods/Masonry/Masonry/MASViewConstraint.m:344
错误原因：
控件没有添加到视图就使用 mas_makeConstraints 了……应该先把控件添加到视图。
【iOS】Assertion failure in -[MASViewConstraint install]
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