我已经创建了下一个字典:
var postJSON = [ids[0]:answersArray[0], ids[1]:answersArray[1], ids[2]:answersArray[2]] as Dictionary
我得到了:
[2: B, 1: A, 3: C]
那么,如何将其转换为JSON呢?
发布于 2015-04-14 20:59:35
你做了一个错误的假设。仅仅因为调试器/Playground在方括号中显示字典(这是Cocoa显示字典的方式),这并不意味着JSON输出就是这样格式化的。
下面是将字符串字典转换为JSON的示例代码:
Swift 3版本:
import Foundation
let dictionary = ["aKey": "aValue", "anotherKey": "anotherValue"]
if let theJSONData = try? JSONSerialization.data(
withJSONObject: dictionary,
options: []) {
let theJSONText = String(data: theJSONData,
encoding: .ascii)
print("JSON string = \(theJSONText!)")
}
要以“美观的打印”格式显示上述内容,您需要将选项行更改为:
options: [.prettyPrinted]
或者在Swift 2语法中:
import Foundation
let dictionary = ["aKey": "aValue", "anotherKey": "anotherValue"]
let theJSONData = NSJSONSerialization.dataWithJSONObject(
dictionary ,
options: NSJSONWritingOptions(0),
error: nil)
let theJSONText = NSString(data: theJSONData!,
encoding: NSASCIIStringEncoding)
println("JSON string = \(theJSONText!)")
它的输出是
"JSON string = {"anotherKey":"anotherValue","aKey":"aValue"}"
或者用漂亮的格式:
{
"anotherKey" : "anotherValue",
"aKey" : "aValue"
}
正如您所期望的那样,字典在JSON输出中包含在大括号中。
编辑:
在Swift 3/4语法中,上面的代码如下所示:
let dictionary = ["aKey": "aValue", "anotherKey": "anotherValue"]
if let theJSONData = try? JSONSerialization.data(
withJSONObject: dictionary,
options: .prettyPrinted
),
let theJSONText = String(data: theJSONData,
encoding: String.Encoding.ascii) {
print("JSON string = \n\(theJSONText)")
}
}
发布于 2015-09-07 20:31:45
我对你的问题的回答如下
let dict = ["0": "ArrayObjectOne", "1": "ArrayObjecttwo", "2": "ArrayObjectThree"]
var error : NSError?
let jsonData = try! NSJSONSerialization.dataWithJSONObject(dict, options: NSJSONWritingOptions.PrettyPrinted)
let jsonString = NSString(data: jsonData, encoding: String.Encoding.utf8.rawValue)! as String
print(jsonString)
答案是
{
"0" : "ArrayObjectOne",
"1" : "ArrayObjecttwo",
"2" : "ArrayObjectThree"
}
发布于 2019-01-10 03:01:15
Swift 4 Dictionary
扩展。
extension Dictionary {
var jsonStringRepresentation: String? {
guard let theJSONData = try? JSONSerialization.data(withJSONObject: self,
options: [.prettyPrinted]) else {
return nil
}
return String(data: theJSONData, encoding: .ascii)
}
}
https://stackoverflow.com/questions/29625133
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