SwiftProject/MvpGoods/Base/YMNavigation...

//
//  YMNavigationController.swift
//  MvpGoods
//
//  Created by 小花 on 2019/3/18.
//  Copyright © 2019年 MVP. All rights reserved.
//

import UIKit

class YMNavigationController: UINavigationController {

    
  
    override func viewDidLoad() {
        super.viewDidLoad()
        
    }
    
    /**
     # 统一所有控制器导航栏左上角的返回按钮
     # 让所有push进来的控制器，它的导航栏左上角的内容都一样
     # 能拦截所有的push操作
     - parameter viewController: 需要压栈的控制器
     - parameter animated:       是否动画
     */
    
    override func pushViewController(_ viewController: UIViewController, animated: Bool) {
        /// 这时push进来的控制器viewController，不是第一个子控制器（不是根控制器）
        if viewControllers.count > 0 {
            // push 后隐藏 tabbar
            viewController.hidesBottomBarWhenPushed = true
            viewController.navigationItem.leftBarButtonItem = UIBarButtonItem(image: UIImage(named: "back_white"), style: .plain, target: self, action: #selector(navigationBackClick))
        }
        super.pushViewController(viewController, animated: true)
    }
    /// 返回按钮
    @objc func navigationBackClick() {
        
        if UIApplication.shared.isNetworkActivityIndicatorVisible {
            UIApplication.shared.isNetworkActivityIndicatorVisible = false
        }
        popViewController(animated: true)
    }

}