Swift Parse.com数据查询到字典

Question

我正在尝试从parse.com获取数据并将数据添加到数组或字典中。我一直都会遇到错误，有人知道从解析中获取数据的最佳解决方案。是否可以返回字典并在另一个函数中使用它？

致命错误：在解包可选值时意外发现nil

func getQuote() {

    var query = PFQuery(className: "Quote")
    var quote = PFObject(className:"Quote")
    var quoteDictionary: [String:String]!

    query.findObjectsInBackgroundWithBlock { (objects: [AnyObject]!, error: NSError!) -> Void in
        if error == nil {
            if let objects = objects as? [PFObject] {
                for object in objects {

                    var quoteText = object["quoteText"] as String
                    var quoteAuthor = object["quoteAuthor"] as String

                    quoteDictionary[quoteAuthor] = quoteText

                    println(quoteDictionary)
                    println(quoteAuthor)
                    println(quoteText)

                }


            }

        } else {
            println("Error")
        }
    }

}

Answer 1

安全地播放并使用默认值：

let quoteText = object["quoteText"] as? String ?? ""
let quoteAuthor = object["quoteAuthor"] as? String ?? ""

这可以安全地处理空值。