CODEWITHSUNDEEP
iosobjective-ciphonearrays
jerfin
jerfin

Reputation: 893

How to get the last previous object from a NSMutableArray in iOs?

NSMutableArray * Cars = [NSMutableArray arrayWithObjects:
                          @"Audi", @"BMW",
                          @"Audi Quattro", @"Audi", nil];

How to get the last previous object from a NSMutableArray? Also each time when i add a new object, i want to fetch the last previous object in the NSMutableArray. Can any one please help.

Upvotes: 1

Views: 2221

Answers (3)

Mert
Mert

Reputation: 1

In this case, I think using category makes sense.

In NSArray category, you can declare a method like:

@implementation NSArray (Utils)

- (id)getNextToLastObject {
    if (self.count < 2) {
        return nil;
    } else {
        return [self objectAtIndex: self.count - 2];
    }
}
@end

Then it can be called for any array in the project like:

Model *model = [modelArray getNextToLastObject];

ps: You should import your category class's header file to your controller.

Upvotes: 0

Rohit Kumar
Rohit Kumar

Reputation: 333

NSMutableArray *car=[[NSMutableArray alloc]init];

car = [NSMutableArray arrayWithObjects:@"Audi", @"BMW",@"Audi Quattro", @"Audi", nil];

int count=(int)[car count];

NSLog(@"Object at second last index %@",[car objectAtIndex:count-2]);

Upvotes: 0

Avi
Avi

Reputation: 7552

For the last object:

id lastObject = array.lastObject;

For the second to last object:

id previousLastObject = array.lastObject;
[array addObject:newObject];

Or

[array addObject:newObject];
id previousLastObject = array[array.count - 2];

Upvotes: 4

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