Hide separator line on one UITableViewCell

If you don't want to draw the separator yourself, use this:

  // Hide the cell separator by moving it to the far right
  cell.separatorInset = UIEdgeInsetsMake(0, 10000, 0, 0);

This API is only available starting from iOS 7 though.

in viewDidLoad, add this line:

self.tableView.separatorColor = [UIColor clearColor];

and in cellForRowAtIndexPath:

for iOS lower versions

if(indexPath.row != self.newCarArray.count-1){
    UIImageView *line = [[UIImageView alloc] initWithFrame:CGRectMake(0, 44, 320, 2)];
    line.backgroundColor = [UIColor redColor];
    [cell addSubview:line];
}

for iOS 7 upper versions (including iOS 8)

if (indexPath.row == self.newCarArray.count-1) {
    cell.separatorInset = UIEdgeInsetsMake(0.f, cell.bounds.size.width, 0.f, 0.f);
}

In the UITableViewDataSource cellForRowAtIndexPath method

Swift :

if indexPath.row == {your row number} {
    cell.separatorInset = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: .greatestFiniteMagnitude)
}

or :

cell.separatorInset = UIEdgeInsetsMake(0, 0, 0, UIScreen.main.bounds.width)

for default Margin:

cell.separatorInset = UIEdgeInsetsMake(0, tCell.layoutMargins.left, 0, 0)

to show separator end-to-end

cell.separatorInset = .zero

Objective-C:

if (indexPath.row == {your row number}) {
    cell.separatorInset = UIEdgeInsetsMake(0.0f, 0.0f, 0.0f, CGFLOAT_MAX);
}

To follow up on Hiren's answer.

in ViewDidLoad and the following line :

self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;

Or, if you are using XIB's or Storyboards change "separator" to "none" :

And in CellForRowAtIndexPath add this :

CGFloat separatorInset; // Separator x position 
CGFloat separatorHeight; 
CGFloat separatorWidth; 
CGFloat separatorY; 
UIImageView *separator;
UIColor *separatorBGColor;

separatorY      = cell.frame.size.height;
separatorHeight = (1.0 / [UIScreen mainScreen].scale);  // This assures you to have a 1px line height whatever the screen resolution
separatorWidth  = cell.frame.size.width;
separatorInset  = 15.0f;
separatorBGColor  = [UIColor colorWithRed: 204.0/255.0 green: 204.0/255.0 blue: 204.0/255.0 alpha:1.0];

separator = [[UIImageView alloc] initWithFrame:CGRectMake(separatorInset, separatorY, separatorWidth,separatorHeight)];
separator.backgroundColor = separatorBGColor;
[cell addSubView: separator];

Here is an example of the result where I display a tableview with dynamic Cells (but only have a single one with contents). The result being that only that one has a separator and not all the "dummy" ones tableview automatically adds to fill the screen.

Hope this helps.

EDIT: For those who don't always read the comments, there actually is a better way to do it with a few lines of code :

override func viewDidLoad() {
    super.viewDidLoad()
    tableView.tableFooterView = UIView()
}