UITableView scrolling delay - ios

Question

Found The solution with help of #parcs and #payal- This link helped -> http://www.appcoda.com/customize-table-view-cells-for-uitableview/
Basically , the table view lags when i scroll, i have gone through many post but it didn't help-
UITableView in UIScrollview scrolling delay
Delayed UIImageView Rendering in UITableView
slow scrolling of UITableView
UITableView lags while scrolling
This is the code , which i am using in cellForRowIndexpath
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"WorkoutCell";
WorkoutCell *cell = (WorkoutCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(!cell)
{
UIViewController *controller=[[UIViewController alloc] initWithNibName:CellIdentifier bundle:nil];
cell=(WorkoutCell *)controller.view;
}
[[cell contentView] setBackgroundColor:[UIColor clearColor]];
[[cell backgroundView] setBackgroundColor:[UIColor clearColor]];
[cell setBackgroundColor:[UIColor clearColor]];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
//diplaying Workout Data
[cell setupFont];
cell.lblPoint.text=[NSString stringWithFormat:#"%#",[[arrTblData objectAtIndex:indexPath.row]valueForKey:#"point"]];
cell.lblReps.text=[[arrTblData objectAtIndex:indexPath.row]valueForKey:#"reps"];
cell.lblWorkoutCategory.text=[[arrTblData objectAtIndex:indexPath.row]valueForKey:#"workout"];
cell.lblWeight.text=[[arrTblData objectAtIndex:indexPath.row]valueForKey:#"weight"];
cell.lblSets.text=[[arrTblData objectAtIndex:indexPath.row]valueForKey:#"sets"];
//Formatting Date
cell.lblPostedDate.text=[NSString stringWithFormat:#"Posted On: %#",[self formatDate:[[arrTblData objectAtIndex:indexPath.row]valueForKey:#"time"]]];
return cell;
}
The Function SetupFont called from cellForRowIndexpath
-
(void)setupFont
{
self.lblPoint.font=DEFAULT_FONT(13);
self.pointLblScreen.font=DEFAULT_FONT(13);
self.lblPostedDate.font=DEFAULT_FONT(13);
self.lblReps.font=DEFAULT_FONT(13);
self.lblSets.font=DEFAULT_FONT(13);
self.lblWeight.font=DEFAULT_FONT(13);
self.lblWorkoutCategory.font=DEFAULT_FONT(18);
self.lblWorkoutCategory.strokeColor=kStrokeColor2;
self.lblWorkoutCategory.strokeSize = kStrokeBigSize;
for(UILabel *lbl in [self subviews])
{
if(lbl.tag==9)
{
lbl.font=DEFAULT_FONT(13);
}
}
}
Format Date Function called from cellForRowIndexpath
#pragma mark - Format Date Function
-(NSMutableString*)formatDate:(NSString*)date
{
NSMutableString *formattedDate=[[NSMutableString alloc]init];
NSUInteger p = 0;
NSUInteger length = [date length];
while ( p < length) {
unichar ch = [date characterAtIndex: p];
if (ch!=' ')
{
if(ch=='-')
{
ch='/';
}
NSString *appendString = [NSString stringWithFormat:#"%c",ch];
[formattedDate appendString:appendString];
p++;
}
else
{
break;
}
}
return formattedDate;
}

Answer 1

This is not the right way to do this:
WorkoutCell *cell = (WorkoutCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(!cell)
{
UIViewController *controller=[[UIViewController alloc] initWithNibName:CellIdentifier bundle:nil];
cell=(WorkoutCell *)controller.view;
}
Instead of this, subclass UITableViewCell and instantiate that cell here as follows:
WorkoutCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:#"WorkoutCell" owner:self options:nil];
cell = [topLevelObjects objectAtIndex:0];
}
Also, move your setupFont method the UITableViewCell subclass.

Answer 2

You are typecasting the UIViewController to UITableviewCell.Instead of that take UITableViewCell class add the outlets whatever you want and use it
(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"CustomCell";
CustomCell *cell = (CustomCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[NSBundle mainBundle]loadNibNamed:#"CustomCell" owner:nil options:nil] objectAtIndex:0];
}
// access that CustomCell variables here
cell.name.text = #"Name";
}

Answer 3

You use
#interface WorkoutCell : UITableViewCell {}
then table view class
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
NSString * const CellIdentifier = #"WorkoutCell";
WorkoutCell *cell = [tableView dequeueReusableCellWithIdentifier: CellIdentifier];
if( !cell )
{
cell = [[WorkoutCell alloc] initWithStyle: UITableViewCellStyleDefault reuseIdentifier: CellIdentifier];
}
}