如何在Swift中点击后更改UIButton图像？

Question

我刚开始学习编码开发，所以这可能是一个很容易的问题。但是，如果我的if语句执行，我想把UIButton的图片更改为存储在image.casset“duellogo”中的图像。但我不知道如何更改UIButton的图像；我只知道如何更改UIImageView的图像。

import UIKit

class ViewController: UIViewController 
{

    @IBOutlet weak var firstCardImageView: UIImageView!
    @IBOutlet weak var secondCardImageView: UIImageView!
    @IBOutlet weak var playRoundButton: UIButton!
    @IBOutlet weak var backgroundImageView: UIImageView!

    @IBOutlet weak var Player1Score: UILabel!
    @IBOutlet weak var Player2Score: UILabel!

    //declaring index score, 0, to player 1 and player 2
    var player1Total=0
    var player2Total=0

    var cardNamesArray:[String] = ["ace", "card2", "card3", "card4", "card5", "card6", "card7", "card8", "card9", "card10", "jack", "queen", "king"]

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

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

    @IBAction func playRoundTapped(sender: UIButton) 
    {
        // create variable to make a random number from 1-13
        var firstRandomNumber:Int = Int(arc4random_uniform(13))
        var firstCardString:String = self.cardNamesArray[firstRandomNumber]
        self.firstCardImageView.image = UIImage(named: firstCardString)

        // create variable to make a random number from 1-13 for second card
        var secondRandomNumber = Int(arc4random_uniform(13))
        var secondCardString:String = self.cardNamesArray[secondRandomNumber]
        self.secondCardImageView.image = UIImage(named: secondCardString)


        // Determine the higher card
        if firstRandomNumber > secondRandomNumber{
            //TODO: first card is lager
            player1Total+=1
            self.Player1Score.text = String(player1Total)
        }else if(firstRandomNumber == secondRandomNumber){
            // ERROR: TRYING TO CHANGE BUTTON IMAGE
            self.playRoundButton.setImage("duellogo", forState: UIControlState.Normal)
            //    ^^ ERROR
        }else{
            //TODO: second card is larger
            player2Total+=1
            self.Player2Score.text = String(player2Total)
        }
    }
}

- Andy Chen

Answer 1

试试这段代码

let image = UIImage(named: "duellogo.png") as UIImage!
self.playRoundButton.setImage(image, forState: .Normal)

- prema janoti

Answer 2

Swift 3：

self.addButton.setImage(UIImage(named: "pending"), for: .normal)

- Henry

Answer 3

基本上，使用之前的代码来从名称创建图像（而不仅仅是指定名称）：

UIImage(named: @"duellogo")

- Wain

Answer 4

如果你想改变按钮的图像，首先要进入你的Main.storyboard。然后在右侧，你需要选择属性检查器。在“按钮”标题下，你可以找到图像字段，在那里你可以选择存储在你的资源中的图像。

- Jay23

Answer 5

你可以尝试使用以下代码处理你的图片：

self.playRoundButton.image = UIImage(named: "duellogo.png")

希望这能对你有所帮助。

- Bigfoot11