[英]UIImageView Array iOS13
我正在尝试学习 Swift,但在这里遇到了一个问题。
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上的错误消息:
1.Argument 传递给不带参数的调用
2.无法将“[UIImageView]”类型的值分配给“UIImageView”类型
3.一行中的连续语句必须用';'分隔
4.预期表达
UIImageView 和 UIImage 有什么区别? 什么时候应该使用它们?
提前谢谢了 !
您想更改.image
属性以更改图像。
要“循环”骰子,您可以这样做:
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])
}
}
我猜你的目标是“随机掷”骰子,所以看看这个略有不同的类:
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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