[快速学会Swift第三方库] SwiftyJSON篇

SwiftyJSON使得用Swift处理JSON数据更加容易。这是解析JSON字符串封装类。实现功能与JavaScript中的JSON.parse相近，使用方便。

目录

• 快速学会Swift第三方库 SwiftyJSON篇
  • 其他操作
  • 解析本地JSON
    • 示例JSON
    • 示例代码
    • 运行结果
  • 解析网络JSON
    • 示例JSON
    • 示例代码
    • 运行结果

其他操作

在Target->工程名->Build Settings->Search Paths->User Header Search Paths处添加SwiftyJSON所在的目录：

最后在你需要用到SwiftyJSON的类中加上：

import SwiftyJSON

解析本地JSON

示例JSON

创建一个本地文档“Notes.json”用于测试

{"ResultCode":0,"Record":[{"ID":"1","Date":"2016-5-23","Content":"策划","UserID":"summer"},{"ID":"2","Date":"2016-5-24","Content":"研发","UserID":"summer"},{"ID":"3","Date":"2016-5-25","Content":"研发","UserID":"summer"},{"ID":"4","Date":"2016-5-26","Content":"测试","UserID":"summer"},{"ID":"5","Date":"2016-5-27","Content":"发布","UserID":"summer"}]}

示例代码

func jsonFromData() {let path = NSBundle.mainBundle().pathForResource("Notes", ofType: "json")!let json = JSON(data: NSData(contentsOfFile: path)!)//从JSON Dictionary中获取key为ResultCode的int值let resultCode = json["ResultCode"].int!print("ResultCode:\(resultCode)")let array = json["Record"]//从JSON Array中进行循环解析for (index,subJson):(String,JSON) in array {let userId = subJson["UserID"].string!let content = subJson["Content"].string!let date = subJson["Date"].string!print("\(index):\(userId) will do \(content) at \(date)")}}

运行结果

ResultCode:00:summer will do 策划 at 2016-5-231:summer will do 研发 at 2016-5-242:summer will do 研发 at 2016-5-253:summer will do 测试 at 2016-5-264:summer will do 发布 at 2016-5-27

• 解析网络JSON

示例JSON

这里可以使用Alamofire提供的测试接口

https://httpbin.org/get

在浏览器中打开该地址可以看到：

{"args": {}, "headers": {"Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8", "Accept-Encoding": "gzip, deflate, br", "Accept-Language": "zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3", "Cache-Control": "max-age=0", "Host": "httpbin.org", "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:46.0) Gecko/20100101 Firefox/46.0"}, "origin": "202.115.52.205", "url": "https://httpbin.org/get"}

示例代码

用苹果自带的NSURLSession进行网络请求，关于网络请求的问题，可以参考Swift学习笔记（3）iOS 9 中的网络请求

func jsonFromNetworking() {var strURL = "https://httpbin.org/get"//等价于strURL=strURL.stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)strURL = strURL.stringByAddingPercentEncodingWithAllowedCharacters(NSCharacterSet(charactersInString: "`#%^{}\"[]|\\<>").invertedSet)!let url = NSURL(string: strURL)!let request = NSURLRequest(URL: url)let session = NSURLSession.sharedSession()let dataTask = session.dataTaskWithRequest(request) { (data, response, error) inif (error != nil){NSLog("Error:\(error?.localizedDescription)")}else{let json = JSON(data: data!)//从JSON Dictionary中获取key为headers的JSON Dictionary，再从其中获取key为Host的string值let host = json["headers","Host"].string!let origin = json["origin"].string!print("host:\(host),origin:\(origin)")}}dataTask.resume()}

或者用第三方库Alamofire进行网络请求，关于Alamofire的问题，可以参考[快速学会Swift第三方库] Alamofire篇

func jsonFromNetworkingByAlamofire() {Alamofire.request(.GET, "https://httpbin.org/get").responseJSON { (response) inswitch response.result{case .Success:if let value = response.result.value{let json = JSON(value)let host = json["headers","Host"].string!let origin = json["origin"].string!print("host:\(host),origin:\(origin)")}case .Failure(let error):print(error)}}}

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运行结果

host:httpbin.org,origin:202.115.52.205