how can we use custom class array in another class?

Question

I would like to assign a custom class array to mutable array. which, is using in another class. i am taking "blowupArray" as custom class array and "arrayForTiles" is taking as another class array. i am creating object as "fireObj" to assign the "blowupArray" into "arrayForTiles" as shown below

 fireObj.arrayForTiles = blowupArray;

i put it as property and synthesize and also imported the class. but, it is printing the "blowupArray" values and it is not printing the "fireObj.arrayForTiles" values.

can any one please suggest me how to use this custom class array into another class.

thanks in advance