ios - swift 3 : Instance Member cannot be used on type “View Controller”

Question

我正在尝试通过调用 viewDidLoad() 的类内的方法来更新 UIimageview 图像。我正在尝试通过以下方式更改图像:

MyIMage.image = UIImage(named: "image2")

但它给了我错误:

Instance member cannot be used on type "view controller"

我哪里出错了？

我的代码:

import UIKit

class ViewController: UIViewController {

    @IBOutlet var MyImage: UIImageView!

    var MyStruct = ChangeImage()

    struct ChangeImage {

        private var _isChanged: Bool = false

        mutating func Set_Change(val: Bool) {

            if (val) {
                MyImage.image = UIImage(named: "image2")
                self._isChanged = true
            } else {
                MyImage.image = UIImage(named: "image1")
                self.isChanged = false
            }
        }

        func isChanged()-> Bool {
            return self._isChanged
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        MyStruct.Set_Change(val: true)
        print (MyStruct.isChanged())
    }

}

Answer 1

以下是已更正的代码摘录，但行中存在相同的错误:let _myImage = MyImage()

class ViewController: UIViewController {

@IBOutlet var MyImage: UIImageView!

var MyStruct = ChangeImage()

struct ChangeImage {
    private var _isChanged: Bool = false
    let _myImage = MyImage()  // ----> Error : Instance member ‘MyImage’ cannot be used on type ‘ViewController’
    mutating func Set_Change(val: Bool) {

        if (val) {
            _myImage.image = UIImage(named: "image2")
            self._isChanged = true
        } else {
            _myImage.image = UIImage(named: "image1")
            self._isChanged = false
        }
    }

    func isChanged()-> Bool {
        return self._isChanged
    }
}