swift4初探之网络请求
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都说程序员必须要写博客，可是作为一个老程序员的我基本上是看别人的博客，自己很少写，其中最主要的原因是自己懒，不愿意总结，还一个原因就是现在的网络实在太发达了，写代码也基本不用看什么书，背什么代码，理解几个设计模式，会个选择，顺序，循环就都可以写说自己是程序员了，剩下的哪不会百度就好，下面会出来一堆和你遇到类似问题的人，和类似的问题解决方法，所以我也就更懒得去写了。那么从现在开始就要慢慢改过来了，一方面是觉得自己岁数大了，写了这么久代码是应该总结总结了，另一个原因是swift4现在国内的资源确实不多，所以自己为了以后的发展打算，有必要总结一下，写一下swift4的基本用法，这篇文章主要就是swift4的网络请求，还包括闭包的声明，使用，delegate的声明使用，但是还是有oc的影子，看到@objc了吗？没办法，找不到其他的方法不用@objc，只能一步一步根据提示又把它加上来了，还好最后的用法看起来确实像swift。废话不多说，下面的两片代码，第一个是网络请求封装，包括，post，get请求方式，闭包，代理回调方式，都有。第二个就是调用。自己总结的同时也希望能够抛砖引玉，让更多的人入门，也欢迎大家评论，给出更好的建议和连接。
//
// HTTPConnection.swift
// Swift4HttpConnectionDemo
//
// Created by 高明阳(01370716) on 2017/9/26.
// Copyright © 2017年 高明阳(01370716). All rights reserved.
//
import UIKit
typealias RequestCallBack = (Data?,Error?) ->Void
@objc protocol HTTPConnectionDelegate:NSObjectProtocol {
@objc func finishConnection(data:Data);
@objc func failedConnection(error:Error);
}
class HTTPConnection: NSObject {
var block:RequestCallBack?;
var delegate:HTTPConnectionDelegate?
///类方法
/// get,delegate
class func getRequestWithDelegate(urlStr:String,param:Dictionary<String,AnyObject>?,delegate:HTTPConnectionDelegate){
HTTPConnection().getRequestConnectionWithDelegate(urlStr: urlStr, param: param, delegate: delegate);
}
/// post,delegate
class func postRequestWithDelegate(urlStr:String,param:Dictionary<String,AnyObject>?,delegate:HTTPConnectionDelegate){
HTTPConnection().postRequestConnectionWithDelegate(urlStr: urlStr, param: param, delegate: delegate);
}
/// get,block
class func getRequestWithBlock(urlStr:String,param:Dictionary<String,AnyObject>?,block:@escapingRequestCallBack){
HTTPConnection().getRequestConnectionWithBlock(urlStr: urlStr, param: param, block: block);
}
/// post,delegate
class func postRequestWithBlock(urlStr:String,param:Dictionary<String,AnyObject>?,block:@escapingRequestCallBack){
HTTPConnection().postRequestConnectionWithBlock(urlStr: urlStr, param: param, block: block);
}
///对象方法
/// get,delegate
func getRequestConnectionWithDelegate(urlStr:String,param:Dictionary<String,AnyObject>?,delegate:HTTPConnectionDelegate) -> Void {
self.delegate = delegate;
var myUrlStr:String?;
if param != nil {
let list = NSMutableArray();
for (key ,value) in param! {
let tmp:String ="\(key)=\(value)";
list.add(tmp);
}
let paramStr = list.componentsJoined(by:"&");
myUrlStr = urlStr.appendingFormat("?%@", paramStr);
}else {
myUrlStr = urlStr;
}
print("url:\(myUrlStr!)")
let url = URL(string: myUrlStr!);
let request = URLRequest(url: url!);
let config =URLSessionConfiguration.default;
let session = URLSession(configuration: config);
let task = session.dataTask(with: request) { (data, response, error)in
if error == nil {
let canDo =self.delegate?.responds(to:#selector(HTTPConnectionDelegate.finishConnection(data:)));
if canDo! {
self.delegate!.finishConnection(data: data!);
}
}else {
let canDo = self.delegate?.responds(to:#selector(HTTPConnectionDelegate.failedConnection(error:)));
if canDo! {
self.delegate!.failedConnection(error: error!);
}
}
}
task.resume();
}
/// post,delegate
func postRequestConnectionWithDelegate(urlStr:String,param:Dictionary<String,AnyObject>?,delegate:HTTPConnectionDelegate) -> Void{
self.delegate = delegate;
print("url:\(urlStr)")
let url = URL(string: urlStr);
var request = URLRequest(url: url!);
request.httpMethod ="POST";
if param != nil {
let list = NSMutableArray();
for (key ,value) in param! {
let tmp:String ="\(key)=\(value)";
list.add(tmp);
}
let paramStr = list.componentsJoined(by:"&");
let paramData = paramStr.data(using: .utf8);
request.httpBody = paramData;
}
let config =URLSessionConfiguration.default;
let session = URLSession(configuration: config);
let task = session.dataTask(with: request) { (data, response, error)in
if error == nil {
let canDo =self.delegate?.responds(to:#selector(HTTPConnectionDelegate.finishConnection(data:)));
if canDo! {
self.delegate!.finishConnection(data: data!);
}
}else {
let canDo = self.delegate?.responds(to:#selector(HTTPConnectionDelegate.failedConnection(error:)));
if canDo! {
self.delegate!.failedConnection(error: error!);
}
}
}
task.resume();
}
/// get ,block 回调
//@noescape。简单的介绍就是如果这个闭包是在这个函数结束前内被调用，就是非逃逸的即noescape。
//@escaping 这个闭包是在函数执行完后才被调用，调用的地方超过了这函数的范围，所以叫逃逸闭包。
func getRequestConnectionWithBlock(urlStr:String,param:Dictionary<String,AnyObject>?,block:@escapingRequestCallBack) -> Void {
self.block = block;
var myUrlStr:String!
if param != nil {
let list = NSMutableArray();
for (key ,value) in param! {
let tmp:String ="\(key)=\(value)";
list.add(tmp);
}
let paramStr = list.componentsJoined(by:"&");
myUrlStr = urlStr.appendingFormat("?%@", paramStr);
}else {
myUrlStr = urlStr;
}
print("url:\(myUrlStr!)")
let url = URL(string: myUrlStr!);
let request = URLRequest(url: url!);
let config =URLSessionConfiguration.default;
let session = URLSession(configuration: config);
let task = session.dataTask(with: request) { (data, response, error)in
self.block?(data,error);
}
task.resume();
}
/// post,block
func postRequestConnectionWithBlock(urlStr:String,param:Dictionary<String,AnyObject>?,block:@escapingRequestCallBack) -> Void {
self.block = block;
print("url:\(urlStr)")
let url = URL(string: urlStr);
var request = URLRequest(url: url!);
request.httpMethod ="POST";
if param != nil {
let list = NSMutableArray();
for (key ,value) in param! {
let tmp:String ="\(key)=\(value)";
list.add(tmp);
}
let paramStr = list.componentsJoined(by:"&");
let paramData = paramStr.data(using: .utf8);
request.httpBody = paramData;
}
let config =URLSessionConfiguration.default;
let session = URLSession(configuration: config);
let task = session.dataTask(with: request) { (data, response, error)in
self.block?(data,error);
}
task.resume();
}
}
====================================================
//
// ViewController.swift
// Swift4HttpConnectionDemo
//
// Created by 高明阳(01370716) on 2017/9/26.
// Copyright © 2017年 高明阳(01370716). All rights reserved.
//
import UIKit
class ViewController: UIViewController ,HTTPConnectionDelegate{
override func viewDidLoad() {
super.viewDidLoad()
// https://facebook.github.io/react-native/movies.json
// HTTPConnection.getRequestWithDelegate(urlStr: "https://facebook.github.io/react-native/movies.json", param: nil, delegate: self);
// HTTPConnection.postRequestWithDelegate(urlStr: "https://facebook.github.io/react-native/movies.json", param: nil, delegate: self);
// HTTPConnection.getRequestWithBlock(urlStr: "https://facebook.github.io/react-native/movies.json", param: nil) { (data, error) in
// if error != nil {
// print("error:\(error!)")
// }else {
// let str = String(data: data!, encoding: .utf8);
// print("data:\(str!)");
// }
// };
HTTPConnection.postRequestWithBlock(urlStr:"https://facebook.github.io/react-native/movies.json", param:nil) { (data, error) in
if error !=nil {
print("error:\(error!)")
}else {
let str =String(data: data!, encoding: .utf8);
print("data:\(str!)");
}
};
}
//MARK:HTTPConnectionDelegate
func finishConnection(data:Data) {
print("finishConnection");
let str:String! =String(data: data, encoding: .utf8);
print("data:\(str!)");
}
func failedConnection(error:Error) {
print("failedConnection:\(error)")
}
}
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