//需要注意的是,当手写Mansory约束时,如果改成NO会引起相关布局错误
self.contentView.translatesAutoresizingMaskIntoConstraints = YES;
translatesAutoresizingMaskIntoConstraints详细解释
当遇到Safe Area In iOS9.0之类的错误时
WX20190829-172322@2x.png
检测约束问题加相关断点
WX20190829-172609@2x.png
//Symbol
UIViewAlertForUnsatisfiableConstraints
//Condition
po [[UIWindow keyWindow] _autolayoutTrace]
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