需要遍历另一个数组内部的数组

Question

I have an array that contains 2 objects. In order to store it on my backend server service, I need to store it inside of another array.

So later on, when I call my server and tell it I want the array object, it sends me a new array object that is holding my original array object.

I need to loop through the new array (that contains my original array), and then loop through all of the objects inside of my original array.

I know how to do a normal for loop and loop through an array, but I have never had to do it like this where you need to loop through an array that is contained inside of another array.

I have been thinking about ways to do this now for about an hour and really have no clue. I think what I need to do is technically called "looping through nested arrays" but I can't seem to find anything about doing this with objective-c.

Thanks for the help.

Answer 1

Use a nested for loop and you can iterate through the objects in both arrays:

for(NSArray* array in arrays){
  for(object* thing in array){
   //do what you want with thing in arrays
  }
}

Answer 2

Do you need to loop through every object in both arrays, or do you need to fetch the object from the outer array and just loop through that?

If you need to loop through all objects in both arrays, @JMarsh 's code will do that.

If you only need to fetch the inner array, then just use an explicit fetch Following JMarsh's format:

NSArray *innerArray = arrays[1];  //Or whatever array index is correct
for(id thing in innerArray)
{
  //do what you want with thing
}