我正在嘗試學習 Swift，但在這里遇到了一個問題。
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var diceImageView1: UIImageView!
@IBOutlet weak var diceImageView2: UIImageView!
var leftDiceNumber=1
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
diceImageView1.image = UIImage(imageLiteralResourceName: "DiceSix")
// change transparency with diceImageView1.alpha=0.7
}
@IBAction func rollButtonPressed(_ sender: UIButton) {
print("button pressed")
diceImageView1 = [ UIImageView(imageLiteralResourceName: "DiceOne"),UIImageView(imageLiteralResourceName: "DiceTwo"),UIImageView(imageLiteralResourceName: "DiceThree"),UIImageView(imageLiteralResourceName: "DiceFour"),UIImageView(imageLiteralResourceName: "DiceFive"),UIImageView(imageLiteralResourceName: "DiceSix")],[leftDiceNumber]
leftDiceNumber=leftDiceNumber 1
}
}
但我得到的只是IBAction上的錯誤訊息：
1.Argument 傳遞給不帶引數的呼叫
2.無法將“[UIImageView]”型別的值分配給“UIImageView”型別
3.一行中的連續陳述句必須用';'分隔
4.預期表達
UIImageView 和 UIImage 有什么區別？什么時候應該使用它們？
提前謝謝了 ！
uj5u.com熱心網友回復：
您想更改.image屬性以更改影像。
要“回圈”骰子，您可以這樣做：
class DiceViewController: UIViewController {
@IBOutlet weak var diceImageView1: UIImageView!
@IBOutlet weak var diceImageView2: UIImageView!
let diceNames: [String] = [
"DiceOne", "DiceTwo", "DiceThree", "DiceFour", "DiceFive", "DiceSix"
]
var leftDiceNumber = 0
override func viewDidLoad() {
super.viewDidLoad()
diceImageView1.image = UIImage(named: diceNames[leftDiceNumber % 6])
}
@IBAction func rollButtonPressed(_ sender: UIButton) {
print("button pressed")
// increment the index
leftDiceNumber = 1
// udpate the image view
diceImageView1.image = UIImage(named: diceNames[leftDiceNumber % 6])
}
}
我猜你的目標是“隨機擲”骰子，所以看看這個略有不同的類：
class DiceViewController: UIViewController {
@IBOutlet weak var diceImageView1: UIImageView!
@IBOutlet weak var diceImageView2: UIImageView!
let diceNames: [String] = [
"DiceOne", "DiceTwo", "DiceThree", "DiceFour", "DiceFive", "DiceSix"
]
override func viewDidLoad() {
super.viewDidLoad()
// start with both dice at One
diceImageView1.image = UIImage(named: diceNames[0])
diceImageView2.image = UIImage(named: diceNames[0])
}
@IBAction func rollButtonPressed(_ sender: UIButton) {
print("button pressed")
// arrays are Zero-based, so get a random Int
// from 0 to 5
//let l = Int.random(in: 0...5)
//let r = Int.random(in: 0...5)
//diceImageView1.image = UIImage(named: diceNames[l])
//diceImageView2.image = UIImage(named: diceNames[r])
// more "modern Swifty" method
if let nm = diceNames.randomElement() {
diceImageView1.image = UIImage(named: nm)
}
if let nm = diceNames.randomElement() {
diceImageView2.image = UIImage(named: nm)
}
}
}
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