项目中自定义Cell，控件使用autoLayout来设置约束，发现运行页面表现正常，但是控制台报如下错误：

1 Unable to simultaneously satisfy constraints. 2     Probably at least one of the constraints in the following list is one you don't want.  3     Try this:  4         (1) look at each constraint and try to figure out which you don't expect;  5         (2) find the code that added the unwanted constraint or constraints and fix it.  6 ( 7     
     
      , 8     
      
       , 9     
       
        ,10     
        
         ,11     
         
          ,12     
          
           ,13 
           
            14 )15 16 17 Will attempt to recover by breaking constraint 18 
            
             19 20 Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.21 The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in 
             
               may also be helpful.
             
            
           
          
         
        
       
      
     

 

问题：

表示约束发生冲突，查看错误信息，其中一个label报约束冲突：

发现在cell中设置的label高度为21.6

但实际代码中计算的label高度为21.667，并设置label高度约束为21.667

说明label约束冲突了

 

解决办法：

在cell中找到这个label，找到这个label的高度约束，对其优先级进行减一操作，

以前是1000，改为999，即当xib中设置的高度约束与代码中更新的高度约束不一致时，

取代码中设置的值。