Question

我对swift非常新，我曾经在目标C中编码，但是现在我在Swift开发时面临很多问题。现在我在项目中导入了json文件

let file = Bundle.main.url(forResource: "test", withExtension: "json")

do {
    let data = try Data(contentsOf: file!)

    //let json = try JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.mutableContainers) as! NSDictionary

    let json:NSArray = try (JSONSerialization.jsonObject(with: data, options:JSONSerialization.ReadingOptions.mutableContainers) as? NSArray)!


    print(json[0])

} catch let error as NSError {
    print("Failed to load: \(error.localizedDescription)")
}

它提供类似

的输出

{
Correct = 1;
    EA = "50 Days  ";
    EB = "40 days";
    EC = "90 days";
    ED = "30  days";
}

我只需要使用密钥＆＃34; EA＆＃34;。

访问内容

以前使用目标C，我曾经像

那样访问它

[[json objectAtIndex:0] objectForKey:@"EA"]

现在当我试图像

那样访问它时

json[0].objectForKey("EA") as? String

它说

类型的价值＆＃39;任何＆＃39;没有会员＆＃39; objectForKey＆＃39;

我该怎么办？

Answer 1

Swift 2

(json[0] as! NSDictionary).objectForKey("EA") as? String

Swift 3＆amp; 4

(json[0] as! NSDictionary).object(forKey: "EA") as? String

如何在swift4中使用key访问Array

1 个答案: