UITableView wrong cell size before scrolling? - ios

Question

I have this UITableView, made in code ,and when i see it first time, the cells size that i read are wrong-hence the icons on the cells calculated wrong and are very small.
Than , when i start scrolling,every cell i scroll through ,its icons (on this cell),becomes bigger and get their right size,and i see also the small icons too, so i have for each cell a small icon and a big icon,where i should only have the big.
Why is that happens ? (this view also has some collection view inside it)
//tabel view
frm.origin.y=self.frame.size.height-openY;
tableView = [[UITableView alloc]initWithFrame:frm style:UITableViewStylePlain];
tableView.delegate=self;
tableView.dataSource=self;
[tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:#"Cell"];
[self addSubview:tableView];
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [actionsMenus count];
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return self.frame.size.height/5.0;
}
- (UITableViewCell *)tableView:(UITableView *)ttableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *simpleTableIdentifier = #"Cell";
UITableViewCell *tcell= [ttableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
NSLog(#"%f", tcell.frame.size.height );
if (tcell == nil)
{
tcell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableIdentifier];
}
NSString *kind=[actionsMenus objectAtIndex:indexPath.row];
NSString *icon=[NSString stringWithFormat:#"%#%d.png",kind,colorIndex];
//icon
UIImage *image=[UIImage imageNamed:icon];
UIImageView *view=[[UIImageView alloc] initWithFrame:CGRectMake(tcell.frame.size.width/2.0-0.8*tcell.frame.size.height/2.0, 0, 0.8*tcell.frame.size.height,0.8*tcell.frame.size.height)];
view.image=image;
[tcell addSubview:view];
return tcell;
}

Answer 1

If you're creating the table in viewDidLoad, I think the UITableView delegate methods are being called before the view's auto-layout is complete; so setting the heightForRowAtIndexPath: to
return self.frame.size.height/5.0;
uses the frame of the view pre-auto-layout to calculate the row height. If you absolutely need heightForRowAtIndexPath: to be dependent on the view's height though, perhaps add the table as a subview after view's layout is complete. For example, instead of adding it in your viewDidLoad, add it in viewDidLayoutSubviews, ex:
- (void) viewDidLayoutSubviews {
//table view
frm.origin.y=self.frame.size.height-openY;
tableView = [[UITableView alloc]initWithFrame:frm style:UITableViewStylePlain];
tableView.delegate=self;
tableView.dataSource=self;
[tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:#"Cell"];
[self addSubview:tableView];
}