仅在首次启动时显示视图-Swift 3 [英] Show a View on First Launch Only - Swift 3

问题描述

我正在实施条款和协议；将条件查看到我的应用中，用户必须接受它们才能继续进行操作，然后当他们接受它们时，他们不再需要遵守条款和条件.条件视图.我遵循了有关如何集成UserDefaults并在有人接受条款的情况下将值存储在本地的教程.但是，我坚持将其实现到根视图控制器中.专门卡在我的viewDidAppear函数上.在if和else语句中会发生什么?

I am implementing a Terms & Conditions view into my app and the user has to accept them to proceed, then when they do accept them, they no longer have to go through the Terms & Conditions view. I followed a tutorial on how to integrate UserDefaults and store the value locally if someone does accept the terms. However I am stuck with implementing it into the root view controller. Specifically stuck on my viewDidAppear function. What goes in the if and else statements?

class TermsAndConditionsViewController: UIViewController, UITextViewDelegate {

@IBOutlet weak var termsTextView: UITextView! {
    didSet {
        termsTextView.delegate = self
    }
}

@IBOutlet weak var acceptButton: UIButton! {
    didSet {
        acceptButton.isHidden = true
    }
}

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    acceptButton.isHidden = scrollView.contentOffset.y + scrollView.bounds.height < scrollView.contentSize.height
}

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    if UserDefaults.standard.bool(forKey: "termsAccepted") {

    } else {

    }
}

@IBAction func acceptButtonTapped(_ sender: Any) {
    performSegue(withIdentifier: "toPeekView", sender: sender)
}

}

推荐答案

可能是指仅在首次启动时显示 ViewController ".

Probably, you mean "Show a ViewController on First Launch Only".

为此目的使用UserDefaults是一个好主意，但是，请检查接受的术语是否不应该位于TermsAndConditionsViewController层，而是应位于AppDelegate-application:didFinishLaunchingWithOptions中可以在其中确定根ViewController应该是TermsAndConditionsViewController还是另一个ViewController(例如HomeViewController).

Using UserDefaults for this purpose is a good idea, however, checking if the term accepted should not be at the TermsAndConditionsViewController layer, instead, it should be in AppDelegate - application:didFinishLaunchingWithOptions, you can decide in it whether the root ViewController should be the TermsAndConditionsViewController or the other ViewController (HomeViewController for example).

AppDelegate:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    let storyboard = UIStoryboard(name: "Main", bundle: nil)

    let rootViewController = storyboard.instantiateViewController(withIdentifier: UserDefaults.standard.bool(forKey: "termsAccepted") ? "termsViewControllerID" : "homeViewControllerID")

    window?.rootViewController = rootViewController

    return true
}

TermsAndConditionsViewController:

class TermsAndConditionsViewController: UIViewController {
    //...

    @IBAction func acceptButtonTapped(_ sender: Any) {
        UserDefaults.standard.set(true, forKey: "termsAccepted")

        performSegue(withIdentifier: "toPeekView", sender: sender)
    }

    //...
}

希望这会有所帮助.

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