Question

I’m trying to add NSMutableArray to other NSMutableArray, a mutable array set as instance ivar, but I allways got the array arrayPlayoff empty. Other thing that I have detected, is that when debugging in the attached method, local variables are not shown in the debugger variables section, even selecting “local” option.

-(void)loadGamesPlayoffs{

    NSMutableArray *eli1 = [[NSMutableArray alloc] init];

    NSMutableArray *eli2 =[[NSMutableArray alloc] init];

    NSMutableArray *eli3 = [[NSMutableArray alloc] init];

    NSMutableArray *eli4 = [[NSMutableArray alloc] init];

    for (NSDictionary *eliminatoria in copaReyArray){

        int eli = [[eliminatoria valueForKey:@"eliminatoria"]integerValue];

        NSLog(@"eli %d", eli);

        if (eli==1){

            [eli1 addObject:eliminatoria];

        } else if (eli==2){

            [eli2 addObject:eliminatoria];

        }else if (eli==3){

            [eli3 addObject:eliminatoria];

        } else if (eli==4){

            [eli4 addObject:eliminatoria];

        }


    }


    [arrayPlayOff addObject:eli1];

    [arrayPlayOff addObject:eli2];

    [arrayPlayOff addObject:eli3];

    [arrayPlayOff addObject:eli4];


   }

 many thanks   

Answer 1

If arrayPlayOff is an Instance Variable you could use properties, your .h should look something like this:

#import <UIKit/UIKit.h>
@interface YourClassViewController : UIViewController{
   NSMutableArray *arrayPlayOff;
   //Some other variables
}

@property (nonatomic, retain) NSMutableArray *arrayPlayOff;

//Some other methods

@end

Then in your .m file you could use:

@implementation YourClassViewController

@synthesize arrayPlayOff;

- (NSMutableArray *)arrayPlayOff{
  if(!arrayPlayOff){
    arrayPlayOff = [[NSMutableArray alloc] init];
  }
  return arrayPlayOff;
}

//Your other methods

//Overwrite the dealloc function so you don't have any memory leaks
- (void)dealloc{
  [arrayPlayOff release];
  [super dealloc];
}

@end

Now you could access your variable as

self.arrayPlayOff

and this way you can be 100% sure that your variable is always initialized.

Your method could look like this (Also you should release your other NSMutableArrays since you are not using after adding them to the arrayPlayOff array):

-(void)loadGamesPlayoffs{

    NSMutableArray *eli1 = [[NSMutableArray alloc] init];

    NSMutableArray *eli2 =[[NSMutableArray alloc] init];

    NSMutableArray *eli3 = [[NSMutableArray alloc] init];

    NSMutableArray *eli4 = [[NSMutableArray alloc] init];

    for (NSDictionary *eliminatoria in copaReyArray){

        int eli = [[eliminatoria valueForKey:@"eliminatoria"]integerValue];

        NSLog(@"eli %d", eli);

        if (eli==1){

            [eli1 addObject:eliminatoria];

        } else if (eli==2){

            [eli2 addObject:eliminatoria];

        }else if (eli==3){

            [eli3 addObject:eliminatoria];

        } else if (eli==4){

            [eli4 addObject:eliminatoria];

        }


    }


    [self.arrayPlayOff addObject:eli1];

    [self.arrayPlayOff addObject:eli2];

    [self.arrayPlayOff addObject:eli3];

    [self.arrayPlayOff addObject:eli4];

    //Releasing the NSMutableArrays
    [eli1 release]; 
    [eli2 release]; 
    [eli3 release]; 
    [eli4 release];

}