[Swift]JSON字符串与字典，Dictionary、数组

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1、JSON字符串与字典(Dictionary)之间的相互转换

 1 import Foundation
 2 //JSON字符串转换为字典(Dictionary)
 3 func getDictionaryFromJSONString(_ jsonString:String) ->NSDictionary{
 4     let jsonData:Data = jsonString.data(using: .utf8)!
 5     let dict = try? JSONSerialization.jsonObject(with: jsonData, options: .mutableContainers)
 6     if dict != nil {
 7         return dict as! NSDictionary
 8     }
 9     return NSDictionary()
10 }
11 
12 //字典(Dictionary)转换为JSON字符串
13 func getJSONStringFromDictionary(_ dictionary:NSDictionary) -> String {
14     if (!JSONSerialization.isValidJSONObject(dictionary)) {
15         print("无法解析出JSON字符串")
16         return String()
17     }
18     let data : NSData! = try? JSONSerialization.data(withJSONObject: dictionary, options: []) as NSData?
19     let JSONString = NSString(data:data as Data,encoding: String.Encoding.utf8.rawValue)
20     return JSONString! as String
21 }

测试：

 1 //JSON字符串
 2 let str:String = "{\"server\":\"192.168.0.1\",\"port\":\"88\",\"username\":\"administrator\",\"password\":\"123456\"}"
 3 print(str)
 4 //Print {"server":"192.168.0.1","port":"88","username":"administrator","password":"123456"}
 5 
 6 //JSON字符串转换为字典(Dictionary)
 7 let strDic = getDictionaryFromJSONString(str)
 8 print(strDic)
 9 //Print
10 /*
11 {
12     server = "192.168.0.1";
13     port = 88;
14     username = administrator;
15     password = "123456";
16 }
17 */
18 
19 //字典(Dictionary)转换为JSON字符串
20 let strJson = getJSONStringFromDictionary(strDic)
21 print(strJson)
22 //Print {"server":"192.168.0.1","port":"88","username":"administrator","password":"123456"}

2、JSON字符串与数组(Array)之间的相互转换

 1 import Foundation
 2 //JSON字符串转换为数组(Array)
 3 func getArrayFromJSONString(_ jsonString:String) ->NSArray{        
 4     let jsonData:Data = jsonString.data(using: .utf8)!         
 5     let array = try? JSONSerialization.jsonObject(with: jsonData, options: .mutableContainers)
 6     if array != nil {
 7         return array as! NSArray
 8     }
 9     return array as! NSArray
10 }
11 
12 //数组(Array)转换为JSON字符串
13 func getJSONStringFromArray(_ array:NSArray) -> String {
14     if (!JSONSerialization.isValidJSONObject(array)) {
15         print("无法解析出JSON字符串")
16         return String()
17     }
18     let data : NSData! = try? JSONSerialization.data(withJSONObject: array, options: []) as NSData!
19     let JSONString = NSString(data:data as Data,encoding: String.Encoding.utf8.rawValue)
20     return JSONString! as String     
21 }

测试:

 1 //JSON字符串
 2 
 3 let str:String = "{\"employees\":[{\"firstName\":\"John\",\"lastName\":\"Doe\" },{ \"firstName\":\"Anna\",\"lastName\":\"Smith\"}]}"
 4 print(str)
 5 //Print {"employees":[{"firstName":"John","lastName":"Doe" },{ "firstName":"Anna","lastName":"Smith"}]}
 6 
 7 //JSON字符串转换为数组(Array)
 8 let strArr = getArrayFromJSONString(str)
 9 print(strArr)
10 //Print Could not cast value of type 'Foundation.NSDictionary' (0x7f7b01c80bb8) to 'Foundation.NSArray' (0x7f7b01c7ad60).
11 
12 //数组(Array)转换为JSON字符串
13 let strJson = getJSONStringFromArray(strArr)
14 print(strJson)
15 //Print