ios - swift 3.0 如何在 Swift 3 中访问 `AnyHashable` 中的 `Any` 类型？

Question

我正在使用 sqlite 文件从 authorId 获取 diaryEntriesTeacher。当我打印变量 authorId is nil 时，它会生成以下 authorId 对象 代码:-

func applySelectQuery() {        
    checkDataBaseFile()
    objFMDB = FMDatabase(path: fullPathOfDB)
    objFMDB.open()
    objFMDB.beginTransaction()

    do {
        let results = try objFMDB.executeQuery("select * from diaryEntriesTeacher", values: nil)



        while results.next() {  
            let totalCount = results.resultDictionary
            let authorId = totalCount?["authorId"]! 
            print("authorId",authorId)
   }


    }
    catch {
        print(error.localizedDescription)
    }
    print(fullPathOfDB)
    self.objFMDB.commit()
    self.objFMDB.close()
}

输出

Answer 1

这就是您访问 [AnyHashable : Any] 字典的方式

var dict : Dictionary = Dictionary<AnyHashable,Any>()
dict["name"] = "sandeep"
let myName : String = dict["name"] as? String ?? ""

在你的情况下

let authorId = totalCount?["authorId"] as? String ?? ""