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