UITableView got null items when scrolling - ios

Question

I have a small application, where i'm trying to load some data in UITableView from a sqlite database. Apparently everything works fine, but when I try to scroll i get Null data.
My code:
self.tblContacts.dataSource = self;
self.tblContacts.delegate = self;
self->mainManager = [[MainManager alloc] init: [NSString stringWithFormat:#"%#/contacts.db", resourcePath]];
self->contactList = [[ContactManager alloc] init];
self->contactList = [mainManager loadContacts];
-----------------------------------------------------
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (NSInteger) numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [self->contactList getContactsCount];
}
- (UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellID = #"Cell";
CustomCell *Cell = [tableView dequeueReusableCellWithIdentifier:CellID];
if (!Cell)
Cell = [[CustomCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellID];
Cell.lblCompany.text = [[self->contactList getContact:indexPath.row] company];
Cell.lblContact.text = [NSString stringWithFormat:#"%# %#", [[self->contactList getContact:indexPath.row] name], [[self->contactList getContact:indexPath.row] surname]];
return Cell;
}
ScreenShot:
If anyone can enlighten me please. Thanks in advance.
Best regards.

Answer 1

I solved it. I'm noob in objective-c and i need to learn more about (strong, weak, retain, assign). I just replace weak by retain in my Contact Class:
#property (retain) NSString *name;
#property (retain) NSString *surname;
#property (retain) NSString *company;
#property (retain) NSString *cif;
#property (retain) NSString *email;
#property (retain) NSString *address;
#property (retain) NSString *city;
#property (retain) NSString *telephone;
#property (retain) NSString *provider;
strong = retain:
it says "keep this in the heap until I don't point to it anymore" in
other words " I'am the owner, you cannot dealloc this before aim fine
with that same as retain"
weak:
it says "keep this as long as someone else points to it strongly"
Source: Objective-C ARC: strong vs retain and weak vs assign
Now works perfectly!
Thanks anyway, regards.

Answer 2

Try this,
- (UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellID = #"Cell";
CustomCell *cell = (CustomCell *) [tableView dequeueReusableCellWithIdentifier:CellID];
if (cell == nil)
{
NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:#"CustomCell" owner:self options:nil];
for (id currentObject in topLevelObjects)
{
if ([currentObject isKindOfClass:[UITableViewCell class]])
{
cell = (CustomCell *) currentObject;
break;
}
}
}
[cell setSelectionStyle:UITableViewCellSelectionStyleNone];
Cell.lblCompany.text = [[self->contactList getContact:indexPath.row] company];
Cell.lblContact.text = [NSString stringWithFormat:#"%# %#", [[self->contactList getContact:indexPath.row] name], [[self->contactList getContact:indexPath.row] surname]];
return Cell;
}