iOS跳转到含有不同UINavigationItem的ViewController的实现方法

想实现这样跳转方法,原本就知道两个UINavigationController不能相互跳转,并且也懒得做自定义modal跳转动画,于是研究了三个小时总算有了两种实现方法

iOS跳转到含有不同UINavigationItem的ViewController的实现方法_第1张图片
APP PUSH跳转
iOS跳转到含有不同UINavigationItem的ViewController的实现方法_第2张图片
APP PUSH跳转

第一种:在viewWillAppear中设置nav bar的隐藏与显示

  1. 在AppDelegate中设置rootVC为含有nav的ViewController
self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
self.window?.makeKeyAndVisible()
let vc = ViewController()
self.window?.rootViewController = UINavigationController(rootViewController: vc)
  1. ViewController:
    在viewWillAppear中设置nav bar的隐藏
override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)
    // 动画必须设置为true,否则会导致转场动画是nav bar不显示
    self.navigationController?.setNavigationBarHidden(true, animated: true) 
}

随意添加一个按钮实现跳转

iOS跳转到含有不同UINavigationItem的ViewController的实现方法_第3张图片
屏幕快照 2016-05-19 下午7.01.08.png
  1. 在SecondViewController中设置显示nav bar
    同样在viewWillAppear设置nav bar为显示
override func viewDidLoad() {
    super.viewDidLoad()
    self.view.backgroundColor = UIColor.whiteColor()
    
    self.navigationItem.title = "首页"
   
    // 最好不要设置leftBarButton,会导致pop手势失效
    // self.navigationItem.leftBarButtonItem = UIBarButtonItem(title: "下一页", style: .Done, target: self, action: #selector(self.returnAction))
}
override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)
    self.navigationController?.setNavigationBarHidden(false, animated: true)
}

这样就实现了从无item到有item的跳转:

iOS跳转到含有不同UINavigationItem的ViewController的实现方法_第4张图片
1.gif
  1. 在ViewController中添加一个自定义的UINavigationBar
    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.backgroundColor = UIColor.whiteColor()
        // 一定要设置nav的view的颜色,否则在跳转时自定义的bar右上角会有黑色。但是如果将自定义的bar设置为其他View(比如UIView)就不会有这种现象
        self.navigationController?.view.backgroundColor = UIColor.whiteColor()
        
        let customBar = UINavigationBar(frame: CGRectMake(0, 0, self.view.frame.width, 64))
        self.view.addSubview(customBar)
        
        let customItem = UINavigationItem(title: "首页")
        customItem.leftBarButtonItem = UIBarButtonItem(title: "进入", style: .Done, target: self, action: #selector(self.next))
        customBar.items = [customItem]
}

效果:


iOS跳转到含有不同UINavigationItem的ViewController的实现方法_第5张图片
2.gif

第二种:封装基类,直接隐藏掉nav bar,添加一个自定义的bar,继承基类即会实现该效果,方便使用

BaseViewController:

class BaseViewController: UIViewController {
    
    // 使用自定义的navigationItem
    // 不能使用原本的navigationItem,当pop回来后里面的item会消失,可能和生命周期有关,不知道它都干了些什么
    var customNavigationItem = UINavigationItem(title: "")
    
    // 怎么私有化navigationItem啊!!这样会失败
//    override private var navigationItem: UINavigationItem
//    override private var navigationItem: UINavigationItem
//    override private var navigationItem: UINavigationItem
//    override private var navigationItem: UINavigationItem {
//        get{
//            return self.navigationItem
//        }
//    }

    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.backgroundColor = UIColor.whiteColor()
        // 隐藏原本的nav
        self.navigationController?.view.backgroundColor = UIColor.whiteColor() // 需要设置点颜色,否则push时右上角会显示一段黑色
        // 必须设置这两个属性,否则会导致pop手势失效
        self.navigationController?.navigationBar.shadowImage = UIImage()
        self.navigationController?.navigationBar.setBackgroundImage(UIImage(), forBarMetrics: .Default)
        self.navigationController?.navigationBar.hidden = true

        // 不能使用这个方法,会导致pop手势失效,也不能把bar removeFromSuperView
//        self.navigationController?.setNavigationBarHidden(true, animated: true)
        
        // 自定义的nav bar,直接加到view上
        let customBar = UINavigationBar(frame: CGRectMake(0, 0, self.view.frame.width, 64))
        self.view.addSubview(customBar)
        
        // 设置item
        customBar.items = [customNavigationItem]
    }
}

使用:
ViewController:

class ViewController: BaseViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.customNavigationItem.title = "首页"
        self.customNavigationItem.leftBarButtonItem = UIBarButtonItem(title: "下一页", style: .Done, target: self, action: #selector(self.next))
    }
    
    func next() {
        let sec = SecondViewController()
        self.navigationController?.pushViewController(sec, animated: true)
    }
}

SecondViewCotroller:

class SecondViewController: BaseViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.backgroundColor = UIColor.whiteColor()
        
        self.customNavigationItem.title = "第二页"
        self.customNavigationItem.leftBarButtonItem = UIBarButtonItem(title: "返回", style: .Done, target: self, action: #selector(self.returnAction))
    }
    
    func returnAction() {
        self.navigationController?.popViewControllerAnimated(true)
    }
}

效果:


iOS跳转到含有不同UINavigationItem的ViewController的实现方法_第6张图片
3.gif

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