escapingClosures.swift

final class Model {
    
    func load(completion: @escaping ([String]) -> Void) {
        // statement
    }
    
}

final class ViewController: UIViewController {
    
    var model: Model! = Model()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        model.load { [unowned self] (items) in
            self.display(items: items)
        }
    }
    
    private func display(items: [String]) {
        // statement
    }
    
}