ios - 使用 NSUserDefaults 保存 ViewController 页面上的触摸按钮，该按钮与导航 Controller 相关

Question

所以我在 View Controller 上有 4 个按钮，它是应用程序的初始 View Controller。

每个按钮都“显示”到不同的导航 Controller (连接到 UITableView)。

我的目标是以某种方式保存使用 NSUserDefaults 触摸的按钮，并跳过 View Controller 并直接转到选定的导航 Controller ，每次打开应用程序时!这可能吗？

我正在用 Swift 写这个

这是我的 AppDelegate(关于“var buttonSelected”的警告):

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

        var buttonSelected = NSUserDefaults.standardUserDefaults().integerForKey("buttonSelected")

        print("run")

        return true
    }
}

这是我的 4 个按钮的 View Controller :

import UIKit

class NSUserDefault: UIViewController {

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {   

        var buttonSelected: Int = 0

        if (segue.identifier == "button1Segue") {

            buttonSelected = 1
        }

        else if (segue.identifier == "button2Segue") {

            buttonSelected = 2
        }

        else if (segue.identifier == "button3Segue"){
            buttonSelected = 3
        }

        else if (segue.identifier == "button4Segue") {
            buttonSelected = 4
        }

        NSUserDefaults.standardUserDefaults().setInteger(buttonSelected, forKey: "buttonSelected") // Save the selection in user defaults
        NSUserDefaults.standardUserDefaults().synchronize() // Save changes

        print("runs")

        if buttonSelected == 1 {
            let welcomeVC: UIViewController = self.storyboard!.instantiateViewControllerWithIdentifier("ONW") as UIViewController
            self.parentViewController?.presentViewController(welcomeVC, animated: true, completion: nil)
        }

        if buttonSelected == 2 {
            let welcomeVC: UIViewController = self.storyboard!.instantiateViewControllerWithIdentifier("OE") as UIViewController
            self.parentViewController?.presentViewController(welcomeVC, animated: true, completion: nil)
        }

        if buttonSelected == 3 {
            let welcomeVC: UIViewController = self.storyboard!.instantiateViewControllerWithIdentifier("OS") as UIViewController
            self.parentViewController?.presentViewController(welcomeVC, animated: true, completion: nil)
        }

        if buttonSelected == 4 {
            let welcomeVC: UIViewController = self.storyboard!.instantiateViewControllerWithIdentifier("ON") as UIViewController
            self.parentViewController?.presentViewController(welcomeVC, animated: true, completion: nil)
        }
    }
}

Answer 1

我希望这对你有用

@IBAction func saveButton(sender: UIButton)
{
    let defaults = NSUserDefaults.standardUserDefaults()
    defaults.setBool(true, forKey: "button1")
    defaults.synchronize()
}

检查按钮会像这样

 func application(application: UIApplication, willFinishLaunchingWithOptions launchOptions: [NSObject : AnyObject]?) -> Bool {

     let prefs = NSUserDefaults.standardUserDefaults()
     if let prefs.boolForKey("button1") == true {          
        // here code if button was clicked
     } else {         
        // here code if button was not clicked
     }

     return true
    }