ios – 在ViewController中创建数组的预期声明错误,无法解决原因

无法构建简单的UIImage数组. (为了简单起见,我已经删除了所有其他代码.)我试图理解为什么声明一个UIImage数组并加载图像在viewDidLoad()中工作,但不是在ViewController的“基础”,这是我似乎需要的地方它可以用于其他工作.

(我注意到它似乎与这个数组声明有关,这会引起我的困惑.我可以在任一位置声明并分配简单的UIImage变量.)

这是我的代码：

//  ViewController.swift


import UIKit

class ViewController: UIViewController {                           

    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.

    }

    var icon = UIImage[]()

    icon.append(UIImage(named: "yes.png"))    <<==== expected declaration error

    icon.append(UIImage(named: "no.png"))

}

但是这段代码没有：

import UIKit
class ViewController: UIViewController {

     override func viewDidLoad() {

        super.viewDidLoad()

        // Do any additional setup after loading the view,typically from a nib.

        var icon = UIImage[]()

        icon.append(UIImage(named: "yes.png"))    <==== no error,and builds

        icon.append(UIImage(named: "no.png"))

    }


    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

        // Dispose of any resources that can be recreated.

    }

}