how to develop UITableView which work like UIPickerView and selected row height is big then other row's in iOS?

Question

I have created one UITableView in UIViewController which work's with all same row height but I want to increase the row height of selected row than other row's. I want to set row height more which is in purpole color cell when it get selected in middle after scrolling. My code and output is as bellow:

ViewController.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
{
  IBOutlet UITableView *tbl;
  IBOutlet UIScrollView *scr;
  int pos;
}
@end

ViewController.m

#import "ViewController.h"
#import "TableViewCell.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
}
-(void)viewWillAppear:(BOOL)animated
{
    scr.frame = CGRectMake(15, 0, 280, 480);
    scr.contentSize = CGSizeMake(scr.frame.size.width, 1320 + 480 - 44);
    tbl.frame = CGRectMake(15, 218, 280, 1320);
}

#pragma mark - TableView DataSource

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return 30;
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath*)indexPath
{
    static NSString *CellIdentifier = @"Cell";

    TableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil)
    {
        cell = [[TableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
                                reuseIdentifier:CellIdentifier];
    }
    cell.textLabel.text =[NSString stringWithFormat:@"Hello row no. %ld",(long)[indexPath row]];
    cell.backgroundColor = [UIColor yellowColor];
    return cell;
}
#pragma mark - TableView Delegate

 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
 {
 }

-(void)setscroll:(int)value
{
    [tbl reloadData];
    NSUInteger indexArr[] = {0,value};
    NSIndexPath *indexPath = [NSIndexPath indexPathWithIndexes:indexArr length:2];

    TableViewCell * theCell = (TableViewCell *)[tbl cellForRowAtIndexPath:indexPath];
    theCell.backgroundColor = [UIColor purpleColor];

    [tbl setContentOffset:CGPointMake(0,theCell.center.y-((44*value)+22)) animated:NO];
}

-(void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset
{
    CGFloat rowHeight = 44;  
    NSLog(@"targetContentOffset %f",targetContentOffset->y);
    CGFloat floatVal = targetContentOffset->y / rowHeight;
    NSInteger rounded = (NSInteger)(lround(targetContentOffset->y));
    NSInteger testRounded = (NSInteger)(lround(floatVal));
    NSLog(@"rounded %ld",(long)rounded);
    NSLog(@"testRounded %ld",(long)testRounded);
    if (testRounded<=0)
    {
        [self setscroll:0];
    }
    else if (testRounded<=29)
    {
    [self setscroll:29];
    }
    else
    {
        [self setscroll:testRounded];
    }
}
@end

Answer 1

Finally Got the correct Solution...! hear i have need to write code in scrollViewDidScroll: method for get content offset of scrollview for gate the position of selected row. this logic code same as scrollViewWillEndDragging: method just set global variable and write in scrollViewDidScroll method last instead of call function.

if (testRounded<=0)
{
    Value = 0;
}
else if (testRounded>=29)
{
    Value = 29;
}
else
{
    Value = testRounded;
}

then after write add code for refresh table and set selected row height more. :

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    NSLog(@"value: %ld",(long)Value);
    RowAtIndex = Value;
    CGPoint offset = CGPointMake(0, ((RowAtIndex*44)));
    [scr setContentOffset:offset animated:YES];
    [tbl reloadData];
}

and then after set the height :

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (indexPath.row == RowAtIndex)
    {
        return 64;
    }
    else
    {
        return 44;
    }
}

and in cellForRowAtIndexPath for change the selected cell color:

if (RowAtIndex == indexPath.row)
{
    cell.backgroundColor = [UIColor purpleColor];
}

Output: