Set NSMutableArray to the new NSMutableArray - objective-c

Question

#implementation RightViewController{
NSMutableArray * tableArray;
}
#synthesize tableView;
- (void)viewDidLoad {
[super viewDidLoad];
tableArray = [[NSMutableArray alloc] init];
}
- (void)refreshTable: (NSMutableArray*)resultsArray{
[tableArray setArray:resultsArray];
NSLog(#"resultsArray : %d : %d", [tableArray count] , [resultsArray count]);
[self.tableView reloadData];
}
It shows me : resultsArray : 0 : 78
Why can't I set information to this array?
I do call refreshTable from another controller like this:
[[[RightViewController alloc] init] refreshTable:resultsArray];
Updated:
tableArray = [NSMutableArray arrayWithArray:resultsArray];
worked for me.
After that i do
- (IBAction)reloadTableButton:(id)sender {
[self refreshTable:tableArray];
}
and it's shows me : resultsArray : 0 : 0
Why is tableArray array empty?

Answer 1

Try setting your tableArray variable like so :
tableArray = [NSMutableArray arrayWithArray:resultsArray];
You might not be retaining your mutable array I would suggest making a #property for your tableArray. Place this before your #synthesize
#property (retain, nonatomic) NSMutableArray *tableArray;

Answer 2

Option 1:
- (void)viewDidLoad {
[super viewDidLoad];
//don't do anything with the array here!
//refreshTable may well be called before the view is loaded
}
- (void)refreshTable: (NSMutableArray*)resultsArray{
if (!self.tableArray) // if it does not exist, then create it on the fly.
self.tableArray = [[NSMutableArray alloc] init];
[tableArray setArray:resultsArray];
[self.tableView reloadData];
}
Option 2:
- (MyClass*) init {
self = [super init];
if (self) {
self.tableArray = [[NSMutableArray alloc] init];
}
}
- (void)viewDidLoad {
[super viewDidLoad];
//don't do anything with the array here!
}
- (void)refreshTable: (NSMutableArray*)resultsArray{
[tableArray setArray:resultsArray]; // you can be sure that init was invoked earlier.
[self.tableView reloadData];
}
Option 3:
- (void)viewDidLoad {
[super viewDidLoad];
//don't do anything with the array here!
}
- (void)refreshTable: (NSMutableArray*)resultsArray{
self.tableArray = [NSMutalbeArray arrayWithArray:resultsArray]; //This creates a new array as a copy of resultsArray and assigns it to tableArray. No need to initialize anything.
[self.tableView reloadData];
}

Answer 3

i believe it should work
RightViewController *controller = [[RightViewController alloc] init];
[controller refreshTable:resultsArray];

Answer 4

#implementation RightViewController{
NSMutableArray * tableArray;
}
#property (strong, nonatomic) NSMutableArray *tableArray; //use the keyword "retain" instead of "strong" in below iOS 5
#synthesize tableView;
#synthesize tableArray;
- (void)viewDidLoad {
[super viewDidLoad];
self.tableArray = [[NSMutableArray alloc] init];
}
- (void)refreshTable: (NSMutableArray*)resultsArray{
self.tableArray = resultsArray;
NSLog(#"resultsArray : %d : %d", [tableArray count] , [resultsArray count]);
[self.tableView reloadData];
}