Value stored '**' is never read
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《1》Value stored ‘**’ is never read
表示‘变量’没有被使用，在当前类中搜索‘变量’，发现只是被赋值并没有被使用。
修改方式：删除或者注释这行代码;
《2》Argument to ‘NSMutableArray’ method ‘addObject:’ cannot be nil
提示可变数组不能添加nil值
修改方式：添加NSString时，要对string进行排空处理
NSMutableArray *array=nil; NSString *string = str.mutableCopy; if (string!=nil) { [array addObject:string]; } 0 0
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