遍历NSDictionary中的字符串数组

Question

我有一个从解析JSON获得的NSDictionary。其中一个对象是一串字符串。我怎样才能遍历这个数组？我完全无法正确地投射所有东西 - 我尝试的所有东西都会引发投射错误。例如。 （很多不同的尝试之一）

if let answers = myDict.object(forKey: "answers") as? Array { 
    for answer in answers { 
     let answerString: String = answer as! String 
     //do something with the string 
    } 
} 

抛出“字符串”是无法转换为“任何”

Answer 1

假设它已经被解析到字典里面的字符串数组，你应该能够做到这样的：

if let answers = myDict["answers"] as? [String] { 
    for answer in answers { 
    // Do something with answer (which is a String) 
    } 
} 

Answer 2

let ans = myDict["answers"] 
if ans is [String] { 
let answers = ans as! [String] 
    for answer in answers { 
     // Do something with answer (which is a String) 
    } 
}