Question

首先，我想为我的无知道歉，因为我刚刚开始学习如何编码。我正在开发一个基本的测验应用程序。我的问题是如何根据具体情况为每个问题添加图像？我想要的是为每个问题显示不同的图像。

到目前为止，这是我的代码：

import UIKit

class ViewController: UIViewController {

    @IBOutlet var QuestionLabel: UILabel!
    @IBOutlet var Button1: UIButton!
    @IBOutlet var Button2: UIButton!
    @IBOutlet var Button3: UIButton!
    @IBOutlet var Button4: UIButton!
    @IBOutlet var LabelEnd: UILabel!
    var CorrectAnswer = String()


    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from     a nib.
        Hide()

        RandomQuestions()   
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func RandomQuestions(){
    var RandomNumber = arc4random() % 4
    RandomNumber += 1

        switch (RandomNumber){

        case 1:
            QuestionLabel.text = "Guess the Athlete"
            Button1.setTitle("Kobe Bryant", forState:   UIControlState.Normal)
            Button2.setTitle("Lebron James", forState: UIControlState.Normal)
            Button3.setTitle("Magic Johnson", forState: UIControlState.Normal)
            Button4.setTitle("Shaq", forState: UIControlState.Normal)
            CorrectAnswer = "1"

        case 2:
            QuestionLabel.text = "Guess the Athlete"
            Button1.setTitle("Paul Gasol", forState: UIControlState.Normal)
            Button2.setTitle("Allen Iverson", forState: UIControlState.Normal)
            Button3.setTitle("Tim Duncan", forState: UIControlState.Normal)
            Button4.setTitle("Jeremy Lin", forState: UIControlState.Normal)
            CorrectAnswer = "1"
            break

        case 3:
            QuestionLabel.text = "Guess the Athlete"
            Button1.setTitle("Blake Griffin", forState: UIControlState.Normal)
            Button2.setTitle("Chris Paul", forState: UIControlState.Normal)
            Button3.setTitle("Shaq", forState: UIControlState.Normal)
            Button4.setTitle("Tony Parker", forState: UIControlState.Normal)
            CorrectAnswer = "2"
            break

        case 4:
            QuestionLabel.text = "Guess the Athlete"
            Button1.setTitle("Dirk Nowitzki", forState: UIControlState.Normal)
            Button2.setTitle("JJ Redick", forState: UIControlState.Normal)
            Button3.setTitle("Ray Allen", forState: UIControlState.Normal)
            Button4.setTitle("Chris Anderson", forState: UIControlState.Normal)
            CorrectAnswer = "4"
            break

        default:
            break
        }
    }

    var timer = NSTimer()

    func Hide() {
        LabelEnd.hidden = true
        timer.invalidate()  //You can remove timer here.
    }

    func UnHide(){
        LabelEnd.hidden = false
    }

    @IBAction func Button1Action(sender: AnyObject) {
        UnHide()
        if(CorrectAnswer == "1"){
            LabelEnd.text = "Correct!"
            LabelEnd.textColor = UIColor.greenColor()
            timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("Hide"), userInfo: nil, repeats: false)
         RandomQuestions()

        }
        else{
            LabelEnd.text = "Wrong"
            LabelEnd.textColor = UIColor.redColor()
            timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("Hide"), userInfo: nil, repeats: false)
        }
    }

    @IBAction func Button2Action(sender: AnyObject) {
        UnHide()
        if(CorrectAnswer == "2"){
            LabelEnd.text = "Correct!"
            LabelEnd.textColor = UIColor.greenColor()
            timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("Hide"), userInfo: nil, repeats: false)
            RandomQuestions()

        }
        else{
            LabelEnd.text = "Wrong"
            LabelEnd.textColor = UIColor.redColor()
            timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("Hide"), userInfo: nil, repeats: false)
        }
    }    

    @IBAction func Button3Action(sender: AnyObject) {
        UnHide()
        if(CorrectAnswer == "3"){
            LabelEnd.text = "Correct!"
            LabelEnd.textColor = UIColor.greenColor()
            timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("Hide"), userInfo: nil, repeats: false)
            RandomQuestions()

        }
        else{
            LabelEnd.text = "Wrong"
            LabelEnd.textColor = UIColor.redColor()
            timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("Hide"), userInfo: nil, repeats: false)
        }
    }

    @IBAction func Button4Action(sender: AnyObject) {
        UnHide()
        if(CorrectAnswer == "4"){
            LabelEnd.text = "Correct!"
            LabelEnd.textColor = UIColor.greenColor()
            timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("Hide"), userInfo: nil, repeats: false)
            RandomQuestions()

        }
        else{
            LabelEnd.text = "Wrong"
            LabelEnd.textColor = UIColor.redColor()
            timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("Hide"), userInfo: nil, repeats: false)
        }
    }
}

Answer 1

您正在寻找的课程是UIImage和UIImageView。您可以在Interface Builder UIImageView文件中添加xib实例，就像按钮和标签一样。然后，您可以为其添加另一个@IBOutlet属性，例如：

@IBOutlet var imageView: UIImageView!

接下来，您需要添加图片文件。我们假设您有一个名为＆＃34; Kobe.png＆＃34;。将其拖放到Xcode项目中，或者放在源文件旁边，或者在项目中可能包含的Images.xcassets文件中创建新的图像资源。资产方法更现代化，但它涉及的更多，将它拖入您的项目对初学者来说很好。

在项目中拥有该文件后，您可以将其作为图像对象访问，如下所示：

UIImage(named: "Kobe")

然后，要将它们放在一起，您可以将其分配给图像视图的image属性：

imageView.image = UIImage(named: "Kobe")

Answer 2

您需要创建UIImageView插座才能显示图片

Answer 3

我对Swift相当新......但在创建新的UIImageView之后您可以使用此代码来确定视图在其边界更改时如何布置其内容。哪个可能对您有用，否则您可能需要调整图像大小？

imageView.contentMode = UIViewContentMode.ScaleAspectFit

其他例子如下：

imageView.contentMode= UIViewContentMode.ScaleToFill
imageView.contentMode = UIViewContentMode.ScaleAspectFill

将图像添加到测验应用程序

3 个答案: