在Swift中创建JSON数组 [英] Creating JSON Array in Swift

问题描述

我的后端期望使用以下JSON正文:

My backend is expecting the following JSON body:

[
    {
        "number":"561310"
    },
    {
        "number":"132333"   
    },
    {
        "number":"561310"   
    }
]

当我这样输入时，它在Postman中效果很好:

It works very nicely in Postman when I enter it like so:

如何使用Swift创建类似的JSON? 现在，我有一个电话号码数组，类型为String.

How can I create a similar JSON using Swift? Right now I've an array of phone numbers with the type String.

let phonenumbers = [String]()
for phonenumber in phonenumbers {
    print(phonenumber)
}

这将打印: 561310 132333 561310

This will print: 561310 132333 561310

制作完JSON之后，我想将其用作AlamoFire的参数.

After making this JSON I want to use it as a parameter for AlamoFire.

推荐答案

let phoneNumbersDictionary = phonenumbers.map({ ["number": $0] })

但是，Alamofire.request期望POST主体为[String: AnyObject?]形式，因此您不能直接传递上述数组.您需要使用

However, Alamofire.request expects the POST body to be in form of [String: AnyObject?] so you can't directly pass the above array in. You need to convert that to a JSON object using .dataWithJSONObject(options:) and pass via NSURLRequest:

let JSON = try? NSJSONSerialization.dataWithJSONObject(phoneNumbersDictionary, options: [])

let request = NSMutableURLRequest(URL: url)
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
request.HTTPMethod = "POST"
request.HTTPBody = JSON

Alamofire.request(request).responseJSON { ...

顺便说一句，dataWithJSONObject返回NSData类型的结果，因此，如果要打印出来，应该将其转换为字符串:

By the way, dataWithJSONObject returns the result of NSData type, so you should convert it to string if you want to print that out:

if let JSON = JSON {
  print(String(data: JSON, encoding: NSUTF8StringEncoding))
}

此外，如果您更喜欢使用内置的NSURLSession库，请查看此

Additionally, if you prefer going with the built-in NSURLSession library, please take a look at this SO question.

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