iOS AFNetwork实现Http相关操作（NetReachable、Get、Post、Upload、Download）

AFNetworking是一个轻量级的iOS网络通信类库。它建立在NSURLConnection和NSOperation等类库的基础上，让很多网络通信功能的实现变得十分简单。它支持HTTP请求和基于REST的网络服务（包括GET、POST、 PUT、DELETE等）。支持ARC。

Github地址：https://github.com/AFNetworking/AFNetworking

当前的AFNetworking版本为 v3.1.0。

特别指出 v3.x 与 v2.x 的区别：Xcode 7+ is required.NSURLConnectionOperation support has been removed

（网上2015年千篇一律的AFNetworking代码都是基于 v2.x 的，到 v3.x 有很多方法deprecated了。所以建议新手还是自己手打一遍比较好）

以下代码为 csdn "chy龙神" 原创，基于XCode7、iOS9.0、Mac OS 10.11

////  ViewController.m//  AFNetworkDemo////  Created by 555chy on 6/27/16.//  Copyright © 2016 555chy. All rights reserved.//#import "ViewController.h"#import "AFNetworking.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}/*  1. AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager]    所有的网络请求，均由manager发起 2. 注意：默认提交请求的数据是二进制的，返回格式是JSON 3. 请求格式    AFHttpRequestSerializer                 二进制    AFJSONRequestSerializer                 JSON    AFPropertyListRequestSerializer         PList(一种特殊的XML，但解析起来相对容易) 4. 返回格式    AFHTTPResponseSerializer                二进制    AFJSONResponseSerialializer             JSON    AFXMLParserResponseSerializer           XML,只能返回XMLParser，还需要自己通过代理方法解析    AFXMLDocumentResponseSerializer         Mac OS X    AFPropertyListResponseSerializerPList   PList    AFImageResponseSerializer               Image    AFCompoundResponseSerializer            组合 */#pragma mark - 检测网络连接-(void)networkReachable {    //sharedManager表示单例    AFNetworkReachabilityManager *networkReachabilityManager = [AFNetworkReachabilityManager sharedManager];    [networkReachabilityManager startMonitoring];    [networkReachabilityManager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {        /*         typedef NS_ENUM(NSInteger, AFNetworkReachabilityStatus) {         AFNetworkReachabilityStatusUnknown          = -1,  未知         AFNetworkReachabilityStatusNotReachable     = 0,   无连接         AFNetworkReachabilityStatusReachableViaWWAN = 1,   2G、3G、4G         AFNetworkReachabilityStatusReachableViaWiFi = 2,   Wifi局域网         };         */        NSString *statusStr;        switch (status) {            case AFNetworkReachabilityStatusUnknown:                statusStr = @"AFNetworkReachabilityStatusUnknown";                break;            case AFNetworkReachabilityStatusNotReachable:                statusStr = @"AFNetworkReachabilityStatusNotReachable";                break;            case AFNetworkReachabilityStatusReachableViaWWAN:                statusStr = @"AFNetworkReachabilityStatusReachableViaWWAN";                break;            case AFNetworkReachabilityStatusReachableViaWiFi:                statusStr = @"AFNetworkReachabilityStatusReachableViaWiFi";                break;        }        NSLog(@"networkReachable %@ = %ld", statusStr, status);    }];}#pragma mark - 上传（下载）文件/* 上传和下载雷同，故这里只介绍下载 (1)上传：@"http://example.com/upload" - (NSURLSessionUploadTask *)uploadTaskWithRequest:(NSURLRequest *)request fromFile:(NSURL *)fileURL progress:(nullable void (^)(NSProgress *uploadProgress))uploadProgressBlock completionHandler:(nullable void (^)(NSURLResponse *response, id _Nullable responseObject, NSError  * _Nullable error))completionHandler; (2)下载：@"http://example.com/download.zip" - (NSURLSessionDownloadTask *)downloadTaskWithRequest:(NSURLRequest *)request progress:(nullable void (^)(NSProgress *downloadProgress))downloadProgressBlock destination:(nullable NSURL * (^)(NSURL *targetPath, NSURLResponse *response))destination completionHandler:(nullable void (^)(NSURLResponse *response, NSURL * _Nullable filePath, NSError * _Nullable error))completionHandler; *///urlStr这个参数可以包含中文-(void)sessionDownload:(NSString *) urlStr {    NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];    AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];    //对url进行urlEncode编码(%编码)    //NS_DEPRECATED(10_0, 10_11, 2_0, 9_0, "Use -stringByAddingPercentEncodingWithAllowedCharacters: instead, which always uses the recommended UTF-8 encoding, and which encodes for a specific URL component or subcomponent since each URL component or subcomponent has different rules for what characters are valid.");    NSString *percentEscapesUrlStr = [urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];    NSString *percentEncodeUrlStr = [urlStr stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLHostAllowedCharacterSet]];    NSLog(@"sessionDownload stringByAddingPercentEscapesUsingEncoding = %@", percentEscapesUrlStr);    NSLog(@"sessionDownload stringByAddingPercentEncodingWithAllowedCharacters = %@", percentEncodeUrlStr);    NSURL *url = [NSURL URLWithString:percentEncodeUrlStr];    NSURLRequest *request = [NSURLRequest requestWithURL:url];    NSURLSessionDownloadTask *downLoadTask = [manager downloadTaskWithRequest:request progress:^(NSProgress * _Nonnull downloadProgress) {                //fraction分数，这里表示百分比下载进度        double downloadFraction = downloadProgress.fractionCompleted;        NSString *downloadDescription = downloadProgress.localizedDescription;        NSString *downloadAdditionalDescription = downloadProgress.localizedAdditionalDescription;        NSLog(@"sessionDownload fractionCompleted = %lf, localizedDescription = %@, localizedAdditionalDescription = %@", downloadFraction, downloadDescription, downloadAdditionalDescription);        } destination:^NSURL * _Nonnull(NSURL * _Nonnull targetPath, NSURLResponse * _Nonnull response) {                NSString *suggestedFileName = response.suggestedFilename;        //保存路径和文件名        NSLog(@"sessionDownload targetPath = %@, response = %@)", targetPath, suggestedFileName);        NSString *cacheDir = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject];        NSString *path = [cacheDir stringByAppendingPathComponent:suggestedFileName];        //如果保存的地址是网络地址，用URLWithString        NSURL *webUrl = [NSURL URLWithString:path];        NSURL *fileUrl = [NSURL fileURLWithPath:path];        NSLog(@"sessionDownload webUrl = %@, fileUrl = %@", webUrl, fileUrl);        return fileUrl;            } completionHandler:^(NSURLResponse * _Nonnull response, NSURL * _Nullable filePath, NSError * _Nullable error) {                NSLog(@"sessionDownload response = %@, filePath = %@, error = %@", response, filePath, error);        }];    //最后的resume是为了防止被ARC回收    [downLoadTask resume];}#pragma mark - Get、POST通过参数上传，通过返回数据下载-(void)sessionGet:(NSString *)urlStr parameters:(NSDictionary *) params {    NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];    AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];    NSURL *url = [NSURL URLWithString:urlStr];    /*     requestMethod有GET、POST等     例如：     NSString *URLString = @"http://example.com";     NSDictionary *parameters = @{@"foo": @"bar", @"baz": @[@1, @2, @3]};     用默认请求方法的话使用的是GET     NSURLRequest *request = [NSURLRequest requestWithURL:url];     */    NSMutableURLRequest *request = [[AFHTTPRequestSerializer serializer] requestWithMethod:@"GET" URLString:urlStr parameters:params error:nil];        NSURLSessionDataTask *dataTask = [manager dataTaskWithRequest:request uploadProgress:nil downloadProgress:nil completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {               NSLog(@"loginByGet response = %@, responseObject = %@, error = %@", response, responseObject, error);            }];    [dataTask resume];}@end