AFNetwork 作用和用法详解

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。

// MJViewController.m
// 03.AFN演练
//
// Created by apple on 14-4-30.
// Copyright (c) 2014年 itcast. All rights reserved.
//

#import "MJViewController.h"
#import "AFNetworking.h"

@interface MJViewController ()

@end

@implementation MJViewController
/**
要使用常规的AFN网络访问

1. AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

所有的网络请求,均有manager发起

2. 需要注意的是,默认提交请求的数据是二进制的,返回格式是JSON

1> 如果提交数据是JSON的,需要将请求格式设置为AFJSONRequestSerializer
2> 如果返回格式不是JSON的,

3. 请求格式

AFHTTPRequestSerializer 二进制格式
AFJSONRequestSerializer JSON
AFPropertyListRequestSerializer PList(是一种特殊的XML,解析起来相对容易)

4. 返回格式

AFHTTPResponseSerializer 二进制格式
AFJSONResponseSerializer 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)
AFPropertyListResponseSerializer PList
AFImageResponseSerializer Image
AFCompoundResponseSerializer 组合
*/

- (void)viewDidLoad
{
[super viewDidLoad];

[self reach];
}

#pragma mark - 演练
#pragma mark - 检测网络连接
- (void)reach
{
/**
AFNetworkReachabilityStatusUnknown = -1, // 未知
AFNetworkReachabilityStatusNotReachable = 0, // 无连接
AFNetworkReachabilityStatusReachableViaWWAN = 1, // 3G 花钱
AFNetworkReachabilityStatusReachableViaWiFi = 2, // 局域网络,不花钱
*/
// 如果要检测网络状态的变化,必须用检测管理器的单例的startMonitoring
[[AFNetworkReachabilityManager sharedManager] startMonitoring];

// 检测网络连接的单例,网络变化时的回调方法
[[AFNetworkReachabilityManager sharedManager] setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
NSLog(@"%d", status);
}];
}

#pragma mark - Session 下载
- (void)sessionDownload
{
NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:config];

NSString *urlString = @"http://localhost/itcast/videos/01.C语言-语法预览.mp4";
urlString = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

NSURL *url = [NSURL URLWithString:urlString];
NSURLRequest *request = [NSURLRequest requestWithURL:url];

NSURLSessionDownloadTask *task = [manager downloadTaskWithRequest:request progress:nil destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {
// 指定下载文件保存的路径
// NSLog(@"%@ %@", targetPath, response.suggestedFilename);
// 将下载文件保存在缓存路径中
NSString *cacheDir = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)[0];
NSString *path = [cacheDir stringByAppendingPathComponent:response.suggestedFilename];

// URLWithString返回的是网络的URL,如果使用本地URL,需要注意
NSURL *fileURL1 = [NSURL URLWithString:path];
NSURL *fileURL = [NSURL fileURLWithPath:path];

NSLog(@"== %@ |||| %@", fileURL1, fileURL);

return fileURL;
} completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) {
NSLog(@"%@ %@", filePath, error);
}];

[task resume];
}

#pragma mark - POST JSON
- (void)postJSON
{
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

NSDictionary *dict = @{@"name": @"zhangsan"};
NSDictionary *dict1 = @{@"name": @"wangwu"};
NSArray *array = @[dict, dict1];
// 设置请求格式
manager.requestSerializer = [AFJSONRequestSerializer serializer];
// 设置返回格式
manager.responseSerializer = [AFHTTPResponseSerializer serializer];

[manager POST:@"http://localhost/postjson.php" parameters:array success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSString *result = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];

NSLog(@"%@", result);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {

}];

}

#pragma mark - 随机文件名上传
- (void)postUpload1
{
// 本地上传给服务器时,没有确定的URL,不好用MD5的方式处理
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
manager.responseSerializer = [AFHTTPResponseSerializer serializer];

[manager POST:@"http://localhost/demo/upload.php" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {

NSURL *fileURL = [[NSBundle mainBundle] URLForResource:@"头像1.png" withExtension:nil];

// 要上传保存在服务器中的名称
// 使用时间来作为文件名 2014-04-30 14:20:57.png
// 让不同的用户信息,保存在不同目录中
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
// 设置日期格式
formatter.dateFormat = @"yyyy-MM-dd HH:mm:ss";
NSString *fileName = [formatter stringFromDate:[NSDate date]];

[formData appendPartWithFileURL:fileURL name:@"uploadFile" fileName:fileName mimeType:@"image/png" error:NULL];

} success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSLog(@"OK");
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"error");
}];
}

#pragma mark - POST上传
- (void)postUpload
{
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
// AFHTTPResponseSerializer就是正常的HTTP请求响应结果:NSData
// 当请求的返回数据不是JSON,XML,PList,UIImage之外,使用AFHTTPResponseSerializer
// 例如返回一个html,text...
//
// 实际上就是AFN没有对响应数据做任何处理的情况
manager.responseSerializer = [AFHTTPResponseSerializer serializer];

// formData是遵守了AFMultipartFormData的对象
[manager POST:@"http://localhost/demo/upload.php" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {

// 将本地的文件上传至服务器
NSURL *fileURL = [[NSBundle mainBundle] URLForResource:@"头像1.png" withExtension:nil];

[formData appendPartWithFileURL:fileURL name:@"uploadFile" error:NULL];
} success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSString *result = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];

NSLog(@"完成 %@", result);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"错误 %@", error.localizedDescription);
}];
}

#pragma mark - JSON
- (void)XMLData
{
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

// 返回的数据格式是XML
manager.responseSerializer = [AFXMLParserResponseSerializer serializer];

NSDictionary *dict = @{@"format": @"xml"};

// 网络访问是异步的,回调是主线程的,因此程序员不用管在主线程更新UI的事情
[manager GET:@"http://localhost/videos.php" parameters:dict success:^(AFHTTPRequestOperation *operation, id responseObject) {

// 如果结果是XML,同样需要使用6个代理方法解析,或者使用第三方库
// 第三方库第三方框架,效率低,内存泄漏
NSLog(@"%@", responseObject);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"%@", error);
}];
}

#pragma mark - JSON
- (void)JSONData
{
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

// 原本需要拼接get访问URL ? & =
NSDictionary *dict = @{@"format": @"json"};

// 网络访问是异步的,回调是主线程的,因此程序员不用管在主线程更新UI的事情
[manager GET:@"http://localhost/videos.php" parameters:dict success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSLog(@"%@", responseObject);
// 提问:NSURLConnection异步方法回调,是在子线程
// 得到回调之后,通常更新UI,是在主线程
NSLog(@"%@", [NSThread currentThread]);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"%@", error);
}];
}

#pragma mark - POST登录
- (void)postLogin
{
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

// 原本需要拼接get访问URL ? & =
NSDictionary *dict = @{@"username": @"wangwu", @"password" : @"wang"};

// 网络访问是异步的,回调是主线程的,因此程序员不用管在主线程更新UI的事情
[manager POST:@"http://localhost/login.php" parameters:dict success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSLog(@"%@", responseObject);
// 提问:NSURLConnection异步方法回调,是在子线程
// 得到回调之后,通常更新UI,是在主线程
NSLog(@"%@", [NSThread currentThread]);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"%@", error);
}];
}

#pragma mark - GET登录
- (void)getLogin
{
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

// 原本需要拼接get访问URL ? & =
NSDictionary *dict = @{@"username": @"wangwu", @"password" : @"wang"};

// 网络访问是异步的,回调是主线程的,因此程序员不用管在主线程更新UI的事情
[manager GET:@"http://localhost/login.php" parameters:dict success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSLog(@"%@", responseObject);
// 提问:NSURLConnection异步方法回调,是在子线程
// 得到回调之后,通常更新UI,是在主线程
NSLog(@"%@", [NSThread currentThread]);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"%@", error);
}];
}

@end