swift - 无法在 Swift 中初始化模型

Question

我希望有一个由用户在主视图 Controller 中创建的数据模型，然后通过prepareForSegue传递到其他 View Controller 。

但是，在我的 View Controller 中，我无法使用该模型，并且由于未包装的可选值而出现错误。

我有:

Class Collection: NSObject {
   var id: String!
   var image: String!
   var apples: Int?
   var oranges: Int?
   var lemons: Int?
}

init(id: String, image: String, apples: Int, oranges: Int, lemons: Int) {
    super.init()
    self.id = id
    self.photo = photo
    self.apples = apples
    self.oranges = oranges
    self.lemons = lemons
}

View Controller :

var collection: Collection!
...
    // if user selects a number ..
    self.collection.oranges = usersSelection
    self.collection.apples = usersSelection
    etc

谁能告诉我我做错了什么？谢谢!

Answer 1

像这样定义你的模型类:

class Collection: NSObject {
    var id: String!
    var image: String!
    var apples: Int?
    var oranges: Int?
    var lemons: Int?

    init(id: String, image: String, apples: Int?, oranges: Int?, lemons: Int?) {

        super.init()
        self.id = id
        self.image = image

        if let _ = apples{
            self.apples = apples
        }
        if let _ = oranges{
            self.oranges = oranges
        }
        if let _ = lemons{
            self.lemons = lemons
        }

    }

}

然后在你的 ViewController 中实现如下:

    class ViewController: UIViewController {
    var collection: Collection!

    override func viewDidLoad() {
        collection = Collection(id: "user selection", image: "useselection", apples: nil, oranges: nil, lemons: nil)
//      collection.image =
//      colection.oranges =
//      ........

    }
}