Struct中的Swift Init可選數組

Question

我可以像下面這樣用optinal來做一個元素，但是我不知道如何在Struct中創建可選數組。

struct HomeElement {
     var title:String!
     var description:String?
     var body:String!

     init(title:String!,description:String,body:String!) {
           self.title = title
           self.description = description
           self.body = body
      }
}

我在UIImage Array無效的代碼下面得到一個異常。 當圖像輸入為零時，我該怎么辦。

struct HomeElement {
     var title:String!
     var description:String?
     var body:String!
     var images = [UIImage]()

     init(title:String!,description:String,body:String!,images:[UIImage]) {
           self.title = title
           self.description = description
           self.body = body
           self.images = images
      }
}

Answer 1

您必須將變量聲明為Optional。

struct HomeElement {
    var title:String!
    var description:String?
    var body:String!
    var images: [UIImage]?

    init(title:String!,description:String,body:String!,images:[UIImage]?) {
           self.title = title
           self.description = description
           self.body = body
           self.images = images
     }
 }