我目前正在使用 iOS 10 和 Swift 3 开发应用程序
我认为我可能已经破坏了控制器之间的导航。
事实上，当我尝试展示一个新的视图控制器时，我在 Xcode 调试器上收到了这个警告。
警告：尝试在其视图不在窗口层次结构中的 Project.StoryBoardManager 上呈现 FirstViewController！
我做了一些研究，但我无法修复我的错误。
我的AppDelegate.swift上有这个
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
let storyboard = UIStoryboard(name:"Authentication", bundle: nil)
let vc = storyboard.instantiateInitialViewController() as UIViewController!
self.window?.rootViewController = vc
self.window?.makeKeyAndVisible()
return true
}
这在我的课堂上呈现新闻观点
class StoryBoardManager: UIViewController{
fileprivate var appD = UIApplication.shared.delegate as! AppDelegate
func changeView(storyboardName: String){
let storyboard = UIStoryboard(name: storyboardName, bundle: nil)
if let vc = storyboard.instantiateInitialViewController() {
vc.modalTransitionStyle = UIModalTransitionStyle.flipHorizontal
vc.modalPresentationStyle = UIModalPresentationStyle.fullScreen
//appD.window?.rootViewController = vc
present(vc, animated: true, completion: nil)
} else {
print("Unable to instantiate VC from \(storyboardName) storyboard")
}
}
override func viewDidLoad(){
super.viewDidLoad()
}
如果我评论 rootViewController 的更新，则不会显示新控制器。
编辑@Zac Kwan
import Foundation
import UIKit
class CustomNavBar: UIView {
fileprivate let _storyBoardManager : StoryBoardManager = StoryBoardManager()
fileprivate var _currentUIViewController : UIViewController = UIViewController()
init() {
super.init(frame: CGRect(x: 0, y: 0, width:0, height:0))
}
func changeViewStoryboard(sender: UIButton!){
if (sender.tag == 0){
self._storyBoardManager.changeView(storyboardName: "View1")
} else if (sender.tag == 1) {
self._storyBoardManager.changeView(storyboardName: "View2")
} else if (sender.tag == 2) {
self._storyBoardManager.changeView(storyboardName: "View3")
} else {
self._storyBoardManager.changeView(storyboardName: "View4")
}
}
override init(frame: CGRect) {
super.init(frame: frame)
}
func createButton(title: String, posX: Double, witdh: Double, tag: Int, font: UIFont) -> UIButton {
let buttonCreated = UIButton(frame: CGRect(x: posX, y: 0, width: witdh, height: 60))
buttonCreated.setTitle(title, for: UIControlState())
buttonCreated.setTitleColor(CommonVariable.darkGrey, for: UIControlState())
buttonCreated.titleLabel!.font = font
buttonCreated.tag = tag
buttonCreated.addTarget(self, action:#selector(self.changeViewStoryboard(sender:)), for: UIControlEvents.touchUpInside)
buttonCreated.backgroundColor = UIColor.white
return buttonCreated
}
required init?(coder aDecoder: NSCoder) {
Super. Inuit (coder: decoder)
addSubview(self.createButton(title: « ChangeView », posX: 256.0, witdh: Double(self._sizeButton) - 1, tag: 1, font: UIFont(name: « Arial », size: 15)!))
addSubview(self.createButton(title: « ChangeView 2 », posX: 512.0, witdh: Double(self._sizeButton) - 1, tag: 2, font: UIFont(name: « Arial », size: 15)!))
}
}