多个label 出现相互拥挤的情况,可参考:
[_unitLabel setContentCompressionResistancePriority:UILayoutPriorityFittingSizeLevel forAxis:UILayoutConstraintAxisHorizontal];//宽度不够时,可以被压缩
[_unitLabel setContentHuggingPriority:UILayoutPriorityRequired/*抱紧*/
forAxis:UILayoutConstraintAxisHorizontal];
[_subLabel setContentCompressionResistancePriority:UILayoutPriorityRequired forAxis:UILayoutConstraintAxisHorizontal];//不可以被压缩,尽量显示完整
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