Find Memory Leaks

gistfile1.m

//
//  MemoryLeakTestTableViewController.m
//  MemoryLeakTest

@interface MemoryLeakTestTableViewController : UITableViewController
{
    NSMutableArray *dataForCellArray1;
}
@property (retain, nonatomic) NSMutableArray *dataForCellArray2;
@property (retain, nonatomic) NSMutableArray *dataForCellArray3;
@property (retain, nonatomic) NSMutableArray *dataForCellArray4;
@property (retain, nonatomic) NSMutableArray *sections;
@end

@implementation MemoryLeakTestTableViewController

@synthesize dataForCellArray2;
@synthesize dataForCellArray3;
@synthesize dataForCellArray4;
@synthesize sections;

- (void)dealloc
{
    [dataForCellArray1 release];
    [dataForCellArray2 release];
    [dataForCellArray3 release];
    [dataForCellArray4 release];
    [sections release];
    [super dealloc];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    NSMutableArray *dataForCellArray = [NSMutableArray array];
    for (int i = 0; i < 10; i++) {
        [dataForCellArray addObject:[NSString stringWithFormat:@"Cell Row %d", i]];
    }
    
    [dataForCellArray1 release];
    dataForCellArray1 = [dataForCellArray mutableCopy];
    self.dataForCellArray2 = [dataForCellArray mutableCopy];
    self.dataForCellArray3 = [[NSMutableArray alloc] initWithArray:dataForCellArray];
    self.dataForCellArray4 = [[[NSMutableArray alloc] initWithArray:dataForCellArray] autorelease];
    
    self.sections = [[[NSMutableArray alloc] init] autorelease];
    for (int i = 0; i < 4; i++) {
        [self.sections addObject:[NSString stringWithFormat:@"dataForCellArray%d", i]];
    }
}

- (void)didReceiveMemoryWarning
{
    [dataForCellArray1 release];
    [dataForCellArray2 release];
    [dataForCellArray3 release];
    [dataForCellArray4 release];
    [sections release];
    dataForCellArray1 = nil;
    dataForCellArray2 = nil;
    dataForCellArray3 = nil;
    dataForCellArray4 = nil;
    sections = nil;
    [super didReceiveMemoryWarning];
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return [self.sections count];
}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    return [self.sections objectAtIndex:section];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    if (section == 0) {
        return [dataForCellArray1 count];
    } else if (section == 1) {
        return [dataForCellArray2 count];
    } else if (section == 2) {
        return [self.dataForCellArray3 count];
    } else if (section == 3) {
        return [self.dataForCellArray4 count];
    }
    return 0;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    }
    if (indexPath.section == 0) {
        cell.textLabel.text = [dataForCellArray1 objectAtIndex:indexPath.row];
    } else if (indexPath.section == 1) {
        cell.textLabel.text = [dataForCellArray2 objectAtIndex:indexPath.row];
    } else if (indexPath.section == 2) {
        cell.textLabel.text = [self.dataForCellArray3 objectAtIndex:indexPath.row];
    } else if (indexPath.section == 3) {
        cell.textLabel.text = [self.dataForCellArray4 objectAtIndex:indexPath.row];
    }
    return cell;
}

@end