Can't read some swift Syntax

Question

I'm learning swift, but sometimes when i look at answers to questions and some of them are impenetrable. How do I implement the following?

If you call - [UITableView setFrame:] from - [UITableViewController viewDidAppear:], it works:

 - (void)viewDidAppear:(BOOL)animated { [self.tableView setFrame:CGRectMake(x, y, w, h)]; }

In order to avoid having black bars on each side of the table view, set the background color of the application's main window to white:

 [[[UIApplication sharedApplication] keyWindow] setBackgroundColor:[UIColor whiteColor]];

Do I override view did appear? what is with the -(void) , and why is the self.tableView line in brackets, and what's the final line represent?

Answer 1

As @Alladinian mentioned, it's Objective-C. Another language you can use for iOS development.
You can get basics of language for example on wiki

Answering your question, in swift it will look like:

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    tableView.frame = CGRect(x: x, y: y, width: w, height: h)
} 

and

UIApplication.shared.keyWindow?.backgroundColor = UIColor.white