How do I make a class conform to a protocol in swift?

Question

I need to make a class conform to a protocol in Swift in order to implement a delegate. How would I do so?

Answer 1

class YourClass: SuperClassIfAny, FirstProtocol, SecondProtocol {
}

Note, though, that some protocols require you to implement delegate methods. For instance, UITableViewDataSource requires you to implement

func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int

and

func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell!

If those are not implemented by the class conforming to the protocol, Xcode will give you a compile error (always check the protocol declaration, Cmd + Click will show you what methods you must implement).

Answer 2

Xcode 6 beta 7 changed the protocol slightly for UITableViewDataSource to match the following syntax on the two required implementations:

6b7 : UITableViewDataSource

func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int 

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell!

compared to 6b6

func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int

func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell

Of key difference is that UITableView, NSIndexPath and UITableViewCell are no longer ' Implicitly Unwrapped Optionals '