//函数
func eatTomatos(a: Int, b: Int) -> Int {
 return a + b
}

//嵌套函数
func eatTomatos(a: Int, b: Int) -> Int {
 //嵌套函数
 func digest(a: Int, b: Int) -> Int {
  return 2 * a + b
 }

 return digest(a: a, b: b)
}

//闭包
var eatTomatos = {(a: Int, b: Int) -> Int in
 return a + b
}

override func viewDidLoad() {
  super.viewDidLoad()
  print(eatTomatos(a: 1, b: 2))//③
  print(eatTomatos(a: 2, b: 3))//④
}

func eatTomatos(a: Int, b: Int) -> Int {
 var numArray: Array<Int> = Array.init()

 //嵌套函数
 func digest(a: Int, b: Int) -> Int {
  numArray.append(a)
  numArray.append(b)
  print(numArray.count)//②
  return 2 * a + b
 }

 print(numArray.count)//①

 return digest(a: a, b: b)
}

//打印的结果依次（①②③④）是：
0
2
4
0
2
7

// 作为参数
override func viewDidLoad() {
 super.viewDidLoad()
 cookTomates { (a, b) in
  print(a)
  print(b)
 }
}

func cookTomates(tomato: (Int, Int) -> Void){
 tomato(1, 2)
}

//作为返回值
override func viewDidLoad() {
 super.viewDidLoad()

 let tomato = gainTomatos()
 print(tomato(2, 3))

}
var eatTomatos: (Int, Int) -> Int = {(a: Int, b: Int) -> Int in
 return a + b
}
func gainTomatos() -> (Int, Int) -> Int {
 return eatTomatos
}

typealias Tomato = (Int, Int) -> Int

override func viewDidLoad() {
 super.viewDidLoad()

 let tomato = gainTomatos()
 print(tomato(2, 3))

}

var eatTomatos: Tomato = {(a: Int, b: Int) -> Int in
 return a + b
}

func gainTomatos() -> Tomato {
 return eatTomatos
}

override func viewDidLoad() {
 super.viewDidLoad()

 let a: A = A()
 a.fromB()

}

typealias Tomato = (Int, Int) -> Int

class A: NSObject {
 let b: B = B()

 func fromB() {
  b.tomato = {
   (x, y) -> Int in
   return x + y
  }
  print(b.toA())
 }

}

class B: NSObject {
 var tomato: Tomato?

 func toA() -> Int {
  let a = 3
  let b = 4
  return tomato!(a, b)
 }

}

import UIKit
import Alamofire
import SwiftyJSON

class ZYLResponse: NSObject {
 //接收数据是否成功
 var isSuccess: Bool = false
 //接收到的字典数据
 var dict: Dictionary<String, Any>?
 //接收到的数组数据
 var array: Array<Any>?
 //错误信息
 var error: Error?
 //JSON
 var json:JSON?

}

typealias DataReply = (ZYLResponse) -> Void

class ZYLNetTool: NSObject {

 ///POST请求
 open static func post(url: String, parameters: Dictionary<String, Any>?, complete: @escaping DataReply) {
  Alamofire.request(url, method: .post, parameters: parameters).responseJSON { (response) in
   let myResponse = ZYLResponse()
   myResponse.isSuccess = response.result.isSuccess
   myResponse.dict = response.result.value as! Dictionary<String, Any>?
   myResponse.array = response.result.value as? Array<Any>
   myResponse.error = response.result.error
   myResponse.json = JSON(data: response.data!)

   complete(myResponse)
  }
 }

 ///GET请求
 open static func get(url: String, parameters: Dictionary<String, Any>?, complete: @escaping DataReply) {
  Alamofire.request(url, method: .get, parameters: parameters).responseJSON { (response) in
   let myResponse = ZYLResponse()
   myResponse.isSuccess = response.result.isSuccess
   myResponse.dict = response.result.value as! Dictionary<String, Any>?
   myResponse.array = response.result.value as? Array<Any>
   myResponse.error = response.result.error
   myResponse.json = JSON(data: response.data!)

   complete(myResponse)
  }
 }

}

//调用
  ZYLNetTool.post(url: HTTP_ACTIVATE_PORT, parameters: paraDict, complete: { (response) in
   if response.isSuccess {
    //请求数据成功

   } else {
    //请求数据失败

   }
  })