Hindi Text Lagging in tableview - ios

Question

I have List of Hindi Text from Web-serviceAnd want to display in UILabel.
I am trying this using following code.
For testing I set static text Like:
NSString *unicode=#"ये भी एक तमाशा है इश्क और मोहब्बत में... - ये भी एक तमाशा है इश्क और मोहब्बत में दिल किसी का होता है और बस किसी का चलता है.";
cell.lblPostContent.text = unicode;
In this way problem is that...My UITableview is not smoothly scrolling. too much lag in UITableView. Is there any way to display this text properly in Hindi language and also to have smooth scrolling on UITableView?
This is My cellForRowAtIndexPath........................
- (UITableViewCell *)tableView:(UITableView *)tableview cellForRowAtIndexPath:(NSIndexPath *)indexPath{
cell=(GroupDetailCustomeCell*)[tableview dequeueReusableCellWithIdentifier:cellIdentifier];
if(cell==nil){
cell=[[GroupDetailCustomeCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
NSString *unicode=[[post.postContent URLDecode] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
if(unicode==nil)
unicode=[post.postContent stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
if([post.postType isEqualToString:#"0"]){
//textonly
cell.lblPostContent.text =unicode;
}
}
return cell;
}

Answer 1

tableView component is a most hard to learn component in whole platform as 90% of iOS applications are data in a tableView. There are many things which could provide this incorrect behaviour. You could possibly try some of that options to fix it:
Most common reason for this type of problems in tableView is heightForRowAtIndexPath method. Try to override it and count real cells height there.
Example:
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
NSString *yourHindiText = [NSString stringWithString:#"some text"];
CGSize yourTextSize = [yourHindiText sizeWithFont:[UIFont fontWithName: #"SomeFont" size:someSize] constrainedToSize:kLabelFrameMaxSize];
return self.tableView.estimatedRowHeight + yourTextSize.height;
}
Try to use estimatedRowHeight property for your cells. As the Apple said, this property providing a nonnegative estimate of the height of rows can improve the performance of loading the table view. If the table contains variable height rows, it might be expensive to calculate all their heights when the table loads. Using estimation allows you to defer some of the cost of geometry calculation from load time to scrolling time.
When you create a self-sizing table view cell, you need to set this property and use constraints to define the cell’s size.
Example:
self.tableView.estimatedRowHeight = 44.0; //in your viewDidLoad method
Always use dequeueReusableCellWithIdentifier:forIndexPath: method in your cellForRowAtIndexPath: if you still not.
Example:
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath]; //in your cellForRowAtIndexPath method.
You may set the row height for cells if the delegate doesn’t implement the tableView:heightForRowAtIndexPath: method with rowHeight property.
Example:
self.tableView.rowHeight = UITableViewAutomaticDimension; //in your viewDidLoad method
There are could be more and more solutions for this problem (like using Core Text Framework or creating layers for using GPU instead of CPU to offload it etc).
You could find plenty of possible solutions here. Please pay attention on the first one.

Answer 2

If limiting is not a problem, you can limit Hindi characters to improve UITableView scroll lag.
Here is the code to limit in swift 3.
extension String
{
func limit(by:Int) -> String {
let startIndex = self.startIndex
let endIndex = self.index(startIndex, offsetBy: by)
let range = Range(uncheckedBounds: (lower:startIndex , upper: endIndex))
return self[range]
}
}
Hope this helps.