ios - 如何转换 Dictionary.Values？进入字符串数组 SWIFT

Question

有没有办法转换类型为 Dictionary.Values 的数组？转换成 String 类型的一维数组？

代码:

docRef.getDocument { (document, error) in
            if let document = document, document.exists {    

                let dataDescription = document.data()?.values  // Type 'Dictionary<String, Any>.Values?' 
                self.array.append(dataDescription)   // Tried dataDescription.values, but it doesn't work

                print("Document data: \(String(describing: dataDescription))")
            } else {
                print("Document does not exist")
            }
        }

Answer 1

您也可以解包数据，然后将值从 Any 映射到 String:

docRef.getDocument { document, error in
    if let document = document, document.exists,    
        let data = document.data()?.values {
            let values = data.values.compactMap{$0 as? String}
            print(values)
        } else {
                print("Document does not exist")
        }
    }
}