Question

所以我在视图控制器上有4个按钮，它是应用程序的初始视图控制器。

每个按钮都是＆＃34; SHOW＆＃34; segued到一个不同的导航控制器（连接到UITableView）。

我的目标是以某种方式保存使用NSUserDefaults触摸的按钮，并在每次打开应用程序时跳过View Controller并直接转到所选的导航控制器！这可能吗？

我在Swift中写这篇文章

这是我的AppDelegate（警告＆＃34; var buttonSelected＆＃34;）：

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个按钮的视图控制器：

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

是的，这是可能的。

1）您已经知道按下了哪个按钮，因此请获取该信息。在prepareForSegue（）或按钮的IBAction中执行此操作（如果有）。

2）将值保存在用户默认值

中

3）当您的应用启动时，请阅读用户默认密钥并显示正确的视图控制器。

以下是保存信息的方法：

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

        var buttonSelected: Int = 0

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

            buttonSelected = 1
        }

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

            buttonSelected = 2
        }

        // Etc . . .

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

以下是选择路径的方法：

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        let buttonSelected = NSUserDefaults.standardUserDefaults().integerForKey("buttonSelected")

        if buttonSelected != 0 {

            let storyboard = UIStoryboard(name: "Main", bundle: nil)
            let vcName = ""

            switch buttonSelected {
            case 1:
                vcName = "Button1Controller"
             case 2:
                // Etc
            }

            let vc = storyboard.instantiateViewControllerWithIdentifier(vcName) 
            self.window?.rootViewController?.presentViewController(vc, animated: true, completion: nil)
        }
        else {
        // The user default wasn't saved yet
        }
    return true
}

Answer 2

我希望这对你有用

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

检查按钮会是这样的

 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
    }

使用NSUserDefaults保存ViewController页面上的触摸按钮，该按钮将分段到导航控制器

2 个答案: