paiai_ios/PaiAi/PaiaiUIKit/Reusable/Extension/UIKit/UIBarButtonItemExt.swift

//
//  UIBarButtonItemExt.swift
//  ExtensionKit
//
//  Created by FFIB on 2017/9/14.
//  Copyright © 2017年 FFIB. All rights reserved.
//

import UIKit

public extension UIBarButtonItem {
    convenience init(space: CGFloat) {
        self.init(barButtonSystemItem: .fixedSpace, target: nil, action: nil)
        self.width = space
    }
    
    convenience init(image: UIImage?, target: Any, action: Selector) {
        let button = UIButton(type: .custom)
        button.frame = CGRect(x: 0, y: 0, width: 40, height: 40)
        button.setImage(image, for: .normal)
        button.addTarget(target, action: action, for: .touchDown)
        self.init(customView: button)
    }
    
    convenience init(title: String, target: Any, action: Selector) {
        let button = UIButton(type: .custom)
        button.frame = CGRect(x: 0, y: 0, width: 44, height: 44)
        button.setTitle(title, for: .normal)
        button.addTarget(target, action: action, for: .touchDown)
        button.sizeToFit()
        self.init(customView: button)
    }
    
    convenience init(titles: [String], btnSpace: CGFloat, target: Any, actions: [Selector]) {
        let barView = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 44))
        var lastX: CGFloat = 0
        for (title, action) in zip(titles, actions) {
            let button = UIButton(type: .custom)
            button.frame = CGRect(x: lastX, y: 2, width: 40, height: 40)
            button.setTitle(title, for: .normal)
            button.addTarget(target, action: action, for: .touchDown)
            button.sizeToFit()
            button.center = CGPoint(x: button.center.x, y: barView.center.y)
            barView.addSubview(button)
            lastX += button.width + btnSpace
        }
        barView.width = lastX
        self.init(customView: barView)
    }
    
    convenience init(images: [UIImage?], btnSpace: CGFloat, target: Any, actions: [Selector]) {
        let barView = UIView(frame: CGRect(x: 0, y: 0, width: 0, height: 36))
        barView.backgroundColor = UIColor.cyan
        
        var last: UIButton?
        for (image, action) in zip(images, actions) {
            let button = UIButton(type: .custom)
            button.translatesAutoresizingMaskIntoConstraints = false
            button.setImage(image, for: .normal)
            button.addTarget(target, action: action, for: .touchDown)
            barView.addSubview(button)
            
            NSLayoutConstraint.activate([
                button.widthAnchor.constraint(equalToConstant: 36),
                button.heightAnchor.constraint(equalToConstant: 36),
                button.centerYAnchor.constraint(equalTo: barView.centerYAnchor),
                button.leadingAnchor.constraint(equalTo: last?.trailingAnchor ?? barView.leadingAnchor)
                ])
            last = button
        }
        
        if let l = last {
            NSLayoutConstraint.activate([l.trailingAnchor.constraint(equalTo: barView.trailingAnchor)])
        }
        
        self.init(customView: barView)
    }
}