InputAccessoryView 键盘上方自定义Action按钮： 上一步，下一步，完成

iOS

1. ViewController 实现 ZZInputAccessoryViewDelegate

2. 添加ZZInputAccessoryView到UITextField

let accessoryView = ZZInputAccessoryView.genZZInputAccessoryView()
accessoryView.viewDelegate = self
textField.inputAccessoryView = accessoryView

具体实现

//
//  ZZInputAccessoryView.swift
//  zaozuo-ios
//
//  Created by wuchuanbo on 2017/7/26.
//  Copyright © 2017年 zaozuo. All rights reserved.
//
import Foundation
public protocol ZZInputAccessoryViewDelegate: NSObjectProtocol {
    func actionDone()
    func actionPrev()
    func actionNext()
}
class ZZInputAccessoryView: UIToolbar {
    private var prevButton: UIBarButtonItem?
    private var nextButton: UIBarButtonItem?
    private var doneButton: UIBarButtonItem?
    weak var viewDelegate: ZZInputAccessoryViewDelegate?
    static func genZZInputAccessoryView() -> ZZInputAccessoryView {
        let viewFrame = CGRect(x: 0, y: 0, width: AppWidth, height: 35)
        return ZZInputAccessoryView(frame: viewFrame)
    }
    override init(frame: CGRect) {
        super.init(frame: frame)
        //toolbar.tintColor = UIColor.blue;
        self.backgroundColor = UIColor.gray;
        prevButton = UIBarButtonItem(title: "上一步", style: UIBarButtonItemStyle.plain, target: self, action: #selector(ZZInputAccessoryView.actionPrev))
        nextButton = UIBarButtonItem(title: "下一步", style: UIBarButtonItemStyle.plain, target: self, action: #selector(ZZInputAccessoryView.actionNext))
        let space: UIBarButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.flexibleSpace, target: nil, action: nil)
        doneButton = UIBarButtonItem(title: "完成", style: UIBarButtonItemStyle.plain, target: self, action: #selector(ZZInputAccessoryView.actionDone))
        if let _prevButton = prevButton,
           let _nextButton = nextButton , let _doneButton = doneButton {
            self.items = [_prevButton, _nextButton, space, _doneButton]
        }
    }
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        zzerror("init(coder:) has not been implemented")
    }
    func actionDone() {
        viewDelegate?.actionDone()
    }
    func actionPrev() {
        viewDelegate?.actionPrev()
    }
    func actionNext() {
        viewDelegate?.actionNext()
    }
}