ios - 从初始化程序返回而不初始化所有存储的属性 Xcode 8

Question

我升级到 Xcode 8，我的应用程序停止工作，我已经能够修复除这个错误之外的所有问题。我一直在网上寻找，但没有找到解决此错误的方法。任何帮助，将不胜感激。这是代码:

struct Party {
    let itemRef:FIRDatabaseReference?
    //
    let userID:String!
    let name:String!
    let title:String!
    let body:String!        

    init (userID:String, name:String, title:String = "", body:String) {
        self.userID = userID
        self.name = name
        self.title = title
        self.body = body
        self.itemRef = nil
    }

    init (snapshot:FIRDataSnapshot) {
        userID = snapshot.key
        itemRef = snapshot.ref

        if let titl = snapshot.value as? [String:AnyObject] {
            for child in titl{
                let shotKey = snapshot.children.nextObject() as! FIRDataSnapshot
                if let title = child.value as? [String:AnyObject]{
                    let title = title["title"]
                    print(title)
                }
            }
        }else{
            title = "Failed To Display Title"
        }

        if let user = snapshot.value as? [String:AnyObject] {
            for child in user{
                let shotKey = snapshot.children.nextObject() as! FIRDataSnapshot
                if let name = child.value as? [String:AnyObject]{
                    let name = name["name"]
                    print(name)
                }
            }
        }else{
            name = "Failed To Display Name"
        }

        if let partyBody = snapshot.value as? [String:AnyObject]{
            for child in partyBody{
                let shotKey = snapshot.children.nextObject() as! FIRDataSnapshot
                if let body = child.value as? [String:AnyObject]{
                    let body = body["body"]
                    print (body)
                }
            }
        }else{
            body = "Failed To Display Time"
        }
    }

    func toAnyObject() -> Any {
        return ["title":title, "name":name, "body":body]
    }
}

Answer 1

您的第二个 init(snapshot:) 函数没有设置 name、title 和 body特定条件下的特性。

title 有以下代码:

if let titl = snapshot.value as? [String:AnyObject] {
    for child in titl{
        let shotKey = snapshot.children.nextObject() as! FIRDataSnapshot
        if let title = child.value as? [String:AnyObject]{
            let title = title["title"]
            print(title)
        }
    }
}else{
    title = "Failed To Display Title"
}

此代码仅在 else 子句中设置 title 属性。 if 部分中对 title 的四个引用是对名为 title 的局部变量的引用，而不是名为 title 的属性.因此编译器会提示您从未设置 title 属性，因为可能存在未设置该属性的代码路径。

name 和 body 也有同样的问题。