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I declared table view as following:

self.tableView = [[UITableView alloc] initWithFrame:CGRectZero style:UITableViewStylePlain];
self.tableView.delegate = self;
self.tableView.dataSource = self;
self.tableView.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag;
self.tableView.scrollEnabled = NO;
self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
self.tableView.estimatedRowHeight = 85.0;
self.tableView.rowHeight = UITableViewAutomaticDimension;
So i actually wrote -         self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
Why does it still exist?
                Try this: cell.separatorInset = UIEdgeInsetsMake(0.f, cell.bounds.size.width, 0.f, 0.f); in cellForRow method
– alexburtnik
                Oct 30, 2016 at 18:40
                You can also use this line on viewWillLayoutSubView method of you viewController self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
– Reinier Melian
                Oct 30, 2016 at 19:33
Swift 5.0 renamed it in :
self.tableView.separatorStyle = UITableViewCell.SeparatorStyle.none
Apply the line in viewDidLoad() method. 
If you want to do it from nib file, set the tableView's Separator property to None 
                Setting separatorStyle seems to have no effect unless the table view is in the window's view hierarchy. If you have a table view on some UIView subclass, you can set it in didMoveToWindow method.
– gonsee
                Aug 29, 2017 at 7:15
Hide tableView separators using UI
Here you select TableView 'Separator' property as 'None'.
https://i.stack.imgur.com/8KyH5.png
You can use the following code because it will not remove the line separators of the sections.:
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
    // Your code here //
    cell.separatorInset = UIEdgeInsetsMake(0.f, [UIScreen mainScreen].bounds.size.width, 0.f, 0.f);
My problem was when I add tableView trough code and I have separate func to show tableview and add it on mainView (slide from bottom) I needed to add this
tableView.separatorStyle = .none
in that func where tableView is added on mainView and constraint it. 
In Swift 4.2 you can conveniently use dot notation on a tableView's separatorStyle. Like so:
tableView.separatorStyle = .none
As @gonsee point out:
"Setting separatorStyle seems to have no effect unless the table view is in the window's view hierarchy. If you have a table view on some UIView subclass"
You should set the seperatorStyle in viewDidAppear if you your table in UIView.
override func viewDidAppear(_ animated: Bool) {
        self.contentView.documentTableView.separatorStyle = .none
you can archive these things in different ways
you can also use this one line of code in viewDidLoad()
override func viewDidLoad() {
   super.viewDidLoad()
   tableView.tableFooterView = UIView()
        
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