How to compare arrays? And change attributes?

Question

I\'m new ios developer, I want to compare and change attributes

Array1 = (object1,object2, object3, object4) Array2 = (object2,object4, object5, object8)

Compare

Answer 1

You can use fast enumeration to pass through array 2, then use containsObject: to check if it belongs to array1:

for (id object in array2)
{
    if ([array1 containsObject:object])
    {
        // change your settings here
    }

You could also create a new array using filteredArrayUsingPredicate:, or get the index paths of the matching objects using indexesOfObjectsPassingTest:. You haven't said how many objects are likely to be in your array so I don't know if performance is going to be an issue.