UITableView not getting populated - iphone

Question

I have a peculiar problem. I created a normal Objective C class called SampleTable. I then extended UITableView instead of NSObject. Then in the initWithFrame constructor I initialized the table. I also made a NSMutableArray object for the datasource. I also conformed UITableViewDelegate and UITableViewDatasource. I have overridden the necessary methods also.
Now I made an object of this class in another class, and added the object as a subview. The tableView is getting drawn according to the CGRectMake() coordinates I gave to the initWithFrame constructor. But it is not getting populated with the data. I don't know what the problem is.
SampleTable.h
#import <Foundation/Foundation.h>
#interface SampleTable : UITableView {
NSMutableArray *ItemArray;
}
#property (nonatomic,retain) NSMutableArray *ItemArray;
-(NSMutableArray *) displayItemArray;
#end
SampleTable.m
#import "SampleTable.h"
#implementation SampleTable
#synthesize ItemArray;
-(id)initWithFrame:(CGRect)frm {
[super initWithFrame:frm];
self.delegate=self;
self.dataSource=self;
[self reloadData];
return self;
}
-(NSMutableArray *) displayItemArray {
if(ItemArray==nil) {
ItemArray=[[NSMutableArray alloc] initWithObjects:#"1",#"2",#"3",#"4",#"5",nil];
}
return ItemArray;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [ItemArray count];
}
-(UITableViewCell *)tableView: (UITableView *)tableView cellForRowAtIndexPath: (NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell= [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell==nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
[cell autorelease];
}
NSString *temp=[self.ItemArray objectAtIndex:indexPath.row];
cell.textLabel.text = temp;
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
NSLog(#"didselect");
}
-(void) dealloc {
[ItemArray release];
[super dealloc];
}
#end

Answer 1

You did never initialize the ItemArray within your code snippet. Remove the displayItemData method and change the initializer towards:
-(id)initWithFrame:(CGRect)frm
{
if ((self = [super initWithFrame:frm])) != nil)
{
self.delegate=self;
self.dataSource=self;
ItemArray=[[NSMutableArray alloc] initWithObjects:#"1",#"2",#"3",#"4",#"5",nil];
[self reloadData];
}
return self;
}
You could also simply call that displayItemArray method within the initializer. I feel that method makes no sense as it stands and hence my recommendation to remove it altogether.
Without trying it myself, I am still pretty confident that you can also get rid of that [self reloadData] within the initializer.

Answer 2

During the -(id)initWithFrame:(CGRect)frm method your code calls -reloadData on the UITableView. At this point in time your ItemArray is not available.
Therefore, when UITableView calls it's delegates -numberOfSectionsInTableView: and -tableView:numberOfRowsInSection: methods to get information on what to display in the view, they return one section with zero rows.
Nothing displayed!
It might be a (one) solution to change your initialization of the ItemArray:
-(NSMutableArray *) displayItemArray {
if(ItemArray==nil) {
ItemArray=[[NSMutableArray alloc] initWithObjects:#"1",#"2",#"3",#"4",#"5",nil];
[self reloadData];
}
return ItemArray;
}

Answer 3

print value of
[self.ItemArray objectAtIndex:indexPath.row];
in NSLog... check wether it prints valid value or not....It seems that array's object releasing somewhere before it..