how to get the count of the NSArray inside of another NSArray?

Question

I have an NSArray containing multiple NSArray s. But I need get the count or size of a particular array but I can not figureout how to do it.

I try in the console:

p [_mainArray[0]count] // error: no known method '-count'; cast the message send to the method's return type

I'll really appreciate if any of knows how can I get the count of the array inside of the array.

Answer 1

如错误所示，您需要转换从数组中检索到的对象：

p [(NSArray *)_mainArray[0] count]

Answer 2

The problem is that _mainArray[0] returns a type of id . To help the debugger, do what it says:

p [(NSArray *)_mainArray[0] count];

The cast tells the debugger that the results of _mainArray[0] is an NSArray .