Ios 在我的ViewController类中访问函数内部的Swift字典变量时出现问题

初始化我的ViewController类，如下所示：

class ViewController: UIViewController {

    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)

        // Create a dict of images for use with the UIView menu tab
        var imageDict = [String:UIImage]()
        imageDict["hudson_terrace"] = UIImage(named: "hudson_terrace")
        imageDict["sky_room"] = UIImage(named: "sky_room")
        imageDict["rivington"] = UIImage(named: "rivington")
        imageDict["highline_ballroom"] = UIImage(named: "highline_ballroom")
        imageDict["gansevoort_park_redroom"] = UIImage(named: "gansevoort_park_redroom")
        imageDict["gansevoort_park_rooftop"] = UIImage(named: "gansevoort_park_rooftop")
        imageDict["evr"] = UIImage(named: "evr")

    }

稍后在类中编写此函数

    func addImageViews () {

        // loop through imageDict and add all the images as UIView subviews of menuScrollView
        for (venue_name, image) in self.imageDict {

        }
    }

我得到的错误是“ViewController”没有名为“imageDict”的成员

---

不确定为什么imageDict在函数内部对我不可用。有人能建议一个更好的放置dict的地方以及如何访问它吗？

您将

imageDict

声明为

init

初始值设定项的局部变量，因此它只存在于该上下文中。一旦函数（初始值设定项）退出，变量就被释放，并且不能在该上下文之外引用

要从类的任何方法引用它，应将其声明为类的属性：

class ViewController: UIViewController {
    var imageDict = [String:UIImage]()

    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)

        // Create a dict of images for use with the UIView menu tab
        imageDict["hudson_terrace"] = UIImage(named: "hudson_terrace")
        imageDict["sky_room"] = UIImage(named: "sky_room")
        imageDict["rivington"] = UIImage(named: "rivington")
        imageDict["highline_ballroom"] = UIImage(named: "highline_ballroom")
        imageDict["gansevoort_park_redroom"] = UIImage(named: "gansevoort_park_redroom")
        imageDict["gansevoort_park_rooftop"] = UIImage(named: "gansevoort_park_rooftop")
        imageDict["evr"] = UIImage(named: "evr")
    }

通过这样做，该属性可用于该类的任何实例方法