CODEWITHSUNDEEP
objective-cioscocoa-touch
Kevin McFadden
Kevin McFadden

Reputation: 357

Accessing NSMutableArray Difficulties

I am trying to build an NSMutableArray each time a button is pressed. I am using NSLog to check the array count after each button pressed and the value is zero. THe code is below.

ProjectViewController.h

NSMutableArray *numberQuery
...
@property (nonatomic, retain) NSMutableArray *numberQuery;

ProjectViewController.m

- (void)makeButtons{
UIButton * pickButton;
int y_plot = 150;
int x_plot = 70;
int z = 0;

for(int y = 1; y < 10; y++)
{

    for(int x = 1; x < 5; x++){
        z++;

        pickButton = [UIButton buttonWithType:UIButtonTypeCustom];
        pickButton.frame = CGRectMake(x*x_plot, y_plot, 60, 40);

        [pickButton setBackgroundImage:[UIImage imageNamed:@"btnUnselected.png"]     forState:UIControlStateNormal];
        [pickButton addTarget:self action:@selector(digitClick:) forControlEvents:UIControlEventTouchUpInside];
        [pickButton setTitle:[NSString stringWithFormat:@"%d",z] forState:UIControlStateNormal];
        pickButton.titleLabel.textColor = [UIColor blackColor]; 
        pickButton.tag = z;
        [self.view addSubview:aButton];
    }
    y_plot=y_plot+45;
  }
}

//************************
- (void)digitClick:(id)sender{
UIButton * chosenButton =(UIButton *)sender;

if ([sender isSelected] ==FALSE) {  
    [sender setSelected:TRUE];
    [chosenButton setBackgroundImage:[UIImage imageNamed:@"btnSelected.png"] forState:UIControlStateNormal];
    chosenButton.titleLabel.textColor = [UIColor whiteColor];

    if([queryNumbersX count]<6){
        [self numberSearchArray:chosenButton.tag];
        }
    }
else
    {[sender setSelected:FALSE];
    [chosenButton setBackgroundImage:[UIImage imageNamed:@"btnUnselected.png"]forState:UIControlStateNormal];
    chosenButton.titleLabel.textColor = [UIColor blackColor];
}

forState:UIControlStateNormal];
NSLog(@"clicked button with title %d",chosenButton.tag); 
}

//************************
-(void) numberSearchArray:(NSInteger)newNumber;
{

   [self.numberQuery addObject:[NSNumber numberWithInt: newNumber]];
   NSLog(@"numberSearchArray %d - count %d",newNumber, [self.numberQuery count]);  
}

Am I using the NSMutableArray in the right manner...declaration?

This is the code in the viewDidLoad method

NSMutableArray *numberQuery = [[NSMutableArray alloc] initWithObjects:nil];

Although I have the array declared int he header file, It seems as though I cannot access it outside of the method in which it was allocated.

Upvotes: 0

Views: 106

Answers (2)

Vincent Bernier
Vincent Bernier

Reputation: 8664

@property (nonatomic, retain) NSMutableArray *numberQuery;

You must balance that with

@synthesize numberQuery;

in the .m

and the correct creation would be

self.numberQuery = [NSMuatableArray arrayWithCapacity:someNumber];

By doing this 

NSMutableArray *numberQuery = [[NSMutableArray alloc] initWithObjects:nil];

You are not using your @property you are creating a new variable, this is why you get the warning that your variable is not use, because it's scope is actually just the viewDidLoad method instead of the object.

Upvotes: 1

taskinoor
taskinoor

Reputation: 46027

It looks like that you have never alloced numberQuery. So it is always nil and thus addObject method is ignored. You need to alloc this in init (or any suitable place you like) and release in dealloc (or in other suitable place).

Upvotes: 1

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