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
简书APP PUSH跳转
简书APP PUSH跳转
第一种：在viewWillAppear中设置nav bar的隐藏与显示
- 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)
- 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
屏幕快照 2016-05-19 下午7.01.08.png
- 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：
1.gif
- 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：
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：
3.gif
