基本的网络请求

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let url = NSURL(string: "http://imba97.cn/wp-json/wp/v2/posts/491")
NSURLSession.sharedSession().dataTaskWithURL(url!) {
	// 尾随闭包的参数，可省略回调函数的参数
	(data, _, _) -> Void in
	// 函数体
	// 1. 反序列化
	NSJSONSerialization.JSONObjectWithData(data!, options: [NSJSONReadingOptions.MutableContainers, NSJSONReadingOptions.MutableLeaves])
}.resume()

JSONObjectWithData的options选项，OC中的按位枚举的方式改为数组的方式设置，如果不设置选项可以直接设为空数组[]

封装网络方法

使用AFNetworking框架进行二次封装，首先使用Cocoapods加载第三方框架

NetworkTools.swift文件

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import UIKit
import AFNetworking

// 枚举
enum requestMethod: String {
	case GET = "GET"
	case POST = "POST"
}

class NetworkTools: AFHTTPSessionManager {
	// 单例
	static let sharedTools: NetworkTools = {
		let tools = NetworkTools(baseURL: nil)
		// 设置反序列化数据格式，系统会自动将OC框架中的NSSet转换成Set
		tools.responseSerializer.acceptableContentTypes?.insert("text/html")
		return tools
	}()
}

// 扩展方法
extension NetworkTools {
	func request(method: requestMethod, URLString: String, parameters: [String: Any]?, finished: (result: Any?, error: NSError?)->()) {
		// 成功回调
		let success = { (task: NSURLSessionDataTask, result: Any) -> Void in
			finished(result: result, error: nil)
		}
		// 失败回调
		let failure = { (task: NSURLSessionDataTask, error: NSError) -> Void in
			print(error)
			finished(result: nil, error: error)
		}
		// 判断GET或POST
		if method == requestMethod.GET {
			GET(URLString, parameters: parameters, success: success, failure: failure)
		} else {
			POST(URLString, parameters: parameters, success: success, failure: failure)
		}
	}
}

调用，ViewController.swift文件

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import UIKit
class ViewController: UIViewController {
	override func viewDidLoad() {
		super.viewDidLoad()
		NetworkTools.sharedTools.request(requestMethod.GET, URLString: "http://imba97.cn/wp-json/wp/v2/posts/491", parameters: nil) { (result, error) -> () in
			print(result)
		}
	}
}