BlockBarButtonItem.swift

import UIKit

class BlockBarButtonItem : UIBarButtonItem {
    
    private var actionHandler: ((Void) -> Void)?
    
    convenience init(image: UIImage?, actionHandler: ((Void) -> Void)?) {
        self.init(image: image, style: UIBarButtonItemStyle.Plain, target: nil, action: nil)
        self.target = self
        self.action = #selector(BlockBarButtonItem.barButtonItemPressed(_:))
        self.actionHandler = actionHandler
    }
    
    convenience init(title: String?, actionHandler: ((Void) -> Void)?) {
        self.init(title: title, style: UIBarButtonItemStyle.Plain, target: nil, action: nil)
        self.target = self
        self.action = #selector(BlockBarButtonItem.barButtonItemPressed(_:))
        self.actionHandler = actionHandler
    }

    convenience init(image: UIImage?, title: String?, actionHandler: ((Void) -> Void)?) {
        let view = UIView(frame: CGRectMake(0, 0, 80, 31))
        
        let button = UIButton(frame: CGRectMake(0, 0, 80, 31))
        button.setImage(image, forState: UIControlState.Normal)
        button.setImage(image, forState: UIControlState.Highlighted)
        button.contentHorizontalAlignment = UIControlContentHorizontalAlignment.Left
        button.tintColor = UINavigationBar.appearance().tintColor
        
        let label = UIButton(frame: CGRectMake(20, 0, 80, 31))
        label.titleLabel?.lineBreakMode = NSLineBreakMode.ByTruncatingTail
        label.setTitle(title, forState: UIControlState.Normal)
        label.contentHorizontalAlignment = UIControlContentHorizontalAlignment.Left
        label.contentVerticalAlignment = UIControlContentVerticalAlignment.Center
        label.userInteractionEnabled = false
        label.setTitleColor(UINavigationBar.appearance().tintColor, forState: UIControlState.Normal)

        button.addSubview(label)
        view.addSubview(button)

        self.init(customView: view)
        
        button.addTarget(self, action: #selector(BlockBarButtonItem.barButtonItemPressed(_:)), forControlEvents: UIControlEvents.TouchUpInside)
        self.actionHandler = actionHandler
    }

    func barButtonItemPressed(sender: UIBarButtonItem) {
        if let actionHandler = self.actionHandler {
            actionHandler()
        }
    }
    
}