Question

I have two NSMutableArray: arrayone and arraytwo

arrayone and arraytwo are full of objects, but I want cancel all objects of arrayone and insert in this array all objects of arraytwo. then I want overwrite arrayone with arraytwo.

Answer 1

Lets say you have:

NSMutableArray *arrayOne = [[NSMutableArray alloc]initWithObjects:@"A", @"B",nil ];
NSMutableArray *arrayTwo = [[NSMutableArray alloc]initWithObjects:@"C", @"D",nil ];

Now you can remove all objects and insert the new objects like this:

[arrayOne removeAllObjects];
[arrayOne addObjectsFromArray:arrayTwo];

Or release the array and initialize a new one like this:

[arrayOne release];
arrayOne = [[NSMutableArray alloc] initWithArray:arrayTwo];

In both cases NSLog(@"%@",arrayOne); shows:

(
    C,
    D
)