swift - 为什么array的append方法不能在viewController中使用？

Question

我是 swift 的初学者。我试图在我的代码中使用数组的 append 方法，但它不起作用。如何正确实现数组？

错误信息:Swift 编译器错误组ViewController.swift:16:5: 预期声明ViewController.swift:11:7: 在“ViewController”声明中

我尝试在我的代码中使用数组的附加方法，但它不起作用。

import UIKit

class ViewController: UIViewController { //Error msg: In declaration of 'ViewController'

@IBOutlet weak var dice: UIImageView!
@IBOutlet weak var dice2: UIImageView!
var dices : [String] = []
dices.append("Hi") //Error: Expected declaration

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

@IBAction func rollPressed(_ sender: UIButton) {
    dice.image = UIImage(named: "dice3")
}

}

我希望我可以将 "hi" 添加到数组 dices 中。

Answer 1

你应该在vc完全启动后在一个函数中调用append

class ViewController: UIViewController { //Error msg: In declaration of 'ViewController'

@IBOutlet weak var dice: UIImageView!
@IBOutlet weak var dice2: UIImageView!
var dices : [String] = [] 

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

    dices.append("Hi") // e.x here
}

@IBAction func rollPressed(_ sender: UIButton) {
    dice.image = UIImage(named: "dice3")  
}

}

或者替换

var dices : [String] = []

与

var dices = ["Hi"]