argument to nsmutablearray method addobject cannot be nil 警告

You cannot add

nil

to an

NSMutableArray

, and you will raise an exception if you try to.

There's

NSNull

, though:

NSNull*myNull =[NSNull null];[myMutableArray addObject:myNull];

nsmutablearray不能添加nil可以是nsnull，所以在向nsmutablearray中添加string时候需要判断一下string是否是nil的然后再添加[/code]