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    [self.cancleButton setContentCompressionResistancePriority:UILayoutPriorityRequired
                                                     forAxis:UILayoutConstraintAxisHorizontal];
                                                     
                                                     
                                                     
                                                     
例如：

左右按钮随文字width变化，中间的title的width随左后按钮的width
    [self.cancleButton setContentCompressionResistancePriority:751 forAxis:UILayoutConstraintAxisHorizontal];
    [self.cancleButton setContentHuggingPriority:300 forAxis:UILayoutConstraintAxisHorizontal];
    
    [self.confirmButton setContentCompressionResistancePriority:751 forAxis:UILayoutConstraintAxisHorizontal];
    [self.confirmButton setContentHuggingPriority:300 forAxis:UILayoutConstraintAxisHorizontal];
    
    [self.titleLabel setContentCompressionResistancePriority:749 forAxis:UILayoutConstraintAxisHorizontal];