在其他文件的 tabBarController 中显示 ViewController，Swift

Question

我正在尝试展示来自另一个 swift 文件的 ViewController。如果我想展示另一个 ViewController 的 ViewController，这会起作用。

这次我想在属于 xib 的 class 中的 tabBarController 中显示一个 ViewController。这会打印："In new init" in presenter，但不会打印："setting up presenter" in VC。有什么想法吗？

（无关代码删掉）

xib 中 class 的代码：

@IBAction func timerBtnAction(_ sender: Any) {
    let vc = UIStoryboard(name: "SleepTimerPopup", bundle: nil).instantiateViewController(withIdentifier: "SleepTimerPopup_UI") as! SleepTimerPopup_UI
    vc.modalPresentationStyle = UIModalPresentationStyle.overCurrentContext
    let currentController = self.getCurrentViewController()
    currentController?.tabBarController?.present(vc, animated: true, completion: nil)
}

func getCurrentViewController() -> UIViewController? {

    if let rootController = UIApplication.shared.keyWindow?.rootViewController {
        var currentController: UIViewController! = rootController
        while( currentController.presentedViewController != nil ) {
            currentController = currentController.presentedViewController
        }
        return currentController
    }
    return nil
}

ViewController 我想在当前上下文中展示：

class SleepTimerPopup_UI: UIViewController, SleepTimerPopupDelegate{


@IBOutlet var shortcutOutlets: [UIButton]!
@IBOutlet weak var timerDoneOutlet: UIButton!
@IBOutlet weak var timePickerOutlet: UIDatePicker!
@IBOutlet weak var sleepTimerContainerView: UIView!
@IBOutlet weak var sleepTimeLabel: UILabel!
@IBOutlet weak var stopWatchBackgroundView: UIView!
@IBOutlet weak var stopWatchImage: UIView!

let sleepTimerPopupDelegate = SleepTimerPopupPresenter()

override func viewDidLoad() {
    super.viewDidLoad()

    setupSleepTimerUI()
    setupSleepTimerDelegate()
}

func setupSleepTimerDelegate(){
    print("setting up presenter") <-- THIS IS NOT PRINTED
    sleepTimerPopupDelegate.setSleepTimerViewDelegate(sleepTimerDelegate : self)
}

ViewController我想在当前上下文中展示的演示者：

class SleepTimerPopupPresenter{

weak private var sleepTimerDelegate : SleepTimerPopupDelegate?
static var sleepTimer = SleepTimer(sleepTimerPopupPresenter: SleepTimerPopupPresenter())
static var doneBtnIsSelected = false
private var latestOutlet : UIButton?
private var setTime : (Int, Int)

init(){
    setTime = (0, 0)

    print("in new init") <----- THIS IS PRINTED

    NotificationCenter.default.addObserver(
        self,
        selector: #selector(self.timeChanged),
        name: Notification.Name("TimeUpdate"),
        object: nil)
}

func setSleepTimerViewDelegate(sleepTimerDelegate : SleepTimerPopupDelegate){
    self.sleepTimerDelegate = sleepTimerDelegate
}

Answer 1

可能您的 currentViewController?.tabBarController 为 nil。通常不是UITabBarController的rootViewController或者不在stack中的时候都是可以的。

您可以像这样简单地展示您的视图控制器：

vc.modalPresentationStyle = .overFullScreen // .fullScreen
currentVieController.present(vc, animated: true, completion: nil)

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