Add UIBarButtonItem action in Swift programmatically - ios

Question

I'm trying to connect an action to my UIBarButtonItem in Swift, programmatically, without any Storyboard.
I can't do it this way :
var b = UIBarButtonItem(title: "Continue", style: .Plain, target: self, action: "sayHello")
Since I use an external library (Font_Awesome_Swift) which doesn't have a constructor to create an UIBarButtonItem with an icon from the library. So I'm doing it this way :
let rightButtonItem = UIBarButtonItem()
rightButtonItem.FAIcon = FAType.FACamera
Then, I want to be able to attach an action to this UIBarButtonItem. I have found in another answer, this solution :
UIApplication.sharedApplication().sendAction(barButtonItem.action, to: barButtonItem.target, from: self, forEvent: nil)
But I don't really understand how to use it. Where should I indicate the name of the selector ?
Thanks!

Answer 1

Swift makes adding an action to a UIBarButtonItem easy for us.
let rightBarButton = UIBarButtonItem()
// add an action
rightBarButton.action = #selector(yourAction)

Answer 2

Ok, just after posting this question, I have found an easy way to solve my issue... With the "default" UIBarButtonItem constructor and the following code :
let rightButtonItem = UIBarButtonItem(title: "Camera", style: .Plain, target: self, action: "launchCamera")
rightButtonItem.FAIcon = FAType.Camera

Answer 3

for example i write this code for UIBarButtonItem:
navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .action , target: self, action: #selector(shareTapped))
and selector code is :
func shareTapped() {
// for share in Social media or Save in local
// let vc = UIActivityViewController(activityItems: [imageView.image!], applicationActivities: [])
// vc.popoverPresentationController?.barButtonItem = navigationItem.rightBarButtonItem
// present(vc, animated: true)
// this line its for share photo in facebook or twitter
if let vc = SLComposeViewController(forServiceType: SLServiceTypeTwitter) {
vc.setInitialText("Look at this great picture!")
vc.add(imageView.image!)
vc.add(URL(string: "http://www.photolib.noaa.gov/nssl"))
present(vc, animated: true)
}
}
and i use image in my app and because of this i using image view.image