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AFNetworking粗解

AFNetworking粗解

作者: 小名一峰 | 来源:发表于2016-04-20 12:04 被阅读309次
    111181.png

    框架GitHub地址AFNetworking

    构造：

    NSURLSession

    • AFURLSessionManager
    • AFHTTPSessionManager

    序列化

    • <AFURLRequestSerialization>
      • AFHTTPRequestSerializer
      • AFJSONRequestSerializer
      • AFPropertyListRequestSerializer
    • <AFURLResponseSerialization>
      • AFHTTPResponseSerializer
      • AFJSONResponseSerializer
      • AFXMLParserResponseSerializer
      • AFXMLDocumentResponseSerializer (Mac OS X)
      • AFPropertyListResponseSerializer
      • AFImageResponseSerializer
      • AFCompoundResponseSerializer

    额外的功能

    • AFSecurityPolicy
    • AFNetworkReachabilityManager

    使用

    AFURLSessionManager

    AFURLSessionManager创建和管理一个NSURLSession
    基于指定的对象nsurlsessionconfiguration对象，符合
    <NSURLSessionTaskDelegate>，<NSURLSessionDataDelegate>，<NSURLSessionDownloadDelegate>，和<NSURLSessionDelegate>

    创建一个下载任务
    NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];

NSURL *URL = [NSURL URLWithString:@"http://example.com/download.zip"];
NSURLRequest *request = [NSURLRequest requestWithURL:URL];

NSURLSessionDownloadTask *downloadTask = [manager downloadTaskWithRequest:request progress:nil destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {

NSURL *documentsDirectoryURL = [[NSFileManager defaultManager] URLForDirectory:NSDocumentDirectory
inDomain:NSUserDomainMask appropriateForURL:nil 
create:NO error:nil]; 

return [documentsDirectoryURL URLByAppendingPathComponent:[response suggestedFilename]];

} completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) 
{ 

NSLog(@"File downloaded to: %@", filePath);
}];

[downloadTask resume];
    创建一个上传的任务
    NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];

NSURL *URL = [NSURL URLWithString:@"http://example.com/upload"];
NSURLRequest *request = [NSURLRequest requestWithURL:URL];

NSURL *filePath = [NSURL fileURLWithPath:@"file://path/to/image.png"];

NSURLSessionUploadTask *uploadTask = [manager uploadTaskWithRequest:request 
fromFile:filePath progress:nil completionHandler:^(NSURLResponse *response, id responseObject, NSError *error) { if (error) { 

NSLog(@"Error: %@", error); 
} else 

{ NSLog(@"Success: %@ %@", response, responseObject); 
}}];

[uploadTask resume];

    创建一个多部分请求上传任务，进步

    NSMutableURLRequest *request = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" 
URLString:@"http://example.com/upload" parameters:nil 
constructingBodyWithBlock:^(id<AFMultipartFormData> formData) { 

[formData appendPartWithFileURL:[NSURL fileURLWithPath:@"file://path/to/image.jpg"] 
name:@"file" fileName:@"filename.jpg" mimeType:@"image/jpeg" error:nil]; 

} error:nil];

AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];

NSURLSessionUploadTask *uploadTask;

uploadTask = [manager uploadTaskWithStreamedRequest:request progress:^(NSProgress * _Nonnull uploadProgress) { 

// This is not called back on the main queue. 
// You are responsible for dispatching to the main queue for UI 

updates dispatch_async(dispatch_get_main_queue(), ^{ 

//Update the progress view [progressView setProgress:uploadProgress.fractionCompleted];

}); } completionHandler:^(NSURLResponse * _Nonnull response, id _Nullable responseObject, NSError * _Nullable error) { 
if (error) { 

NSLog(@"Error: %@", error);
 } else
{

NSLog(@"%@ %@", response, responseObject); 
} }];

[uploadTask resume];

    创建一个数据任务

    NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];

AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];

NSURL *URL = [NSURL URLWithString:@"http://httpbin.org/get"];
NSURLRequest *request = [NSURLRequest requestWithURL:URL];

NSURLSessionDataTask *dataTask = [manager dataTaskWithRequest:request completionHandler:^(NSURLResponse *response, id responseObject, NSError *error) { if (error) { NSLog(@"Error: %@", error); 
} else
 { 
NSLog(@"%@ %@", response, responseObject); 
}}];

[dataTask resume];

    请求序列化
    请求的URL字符串序列化程序创建请求，编码参数作为查询字符串或HTTP体。

    NSString *URLString = @"http://example.com";
NSDictionary *parameters = @{@"foo": @"bar", @"baz": @[@1, @2, @3]};

    查询字符串参数编码

    [[AFHTTPRequestSerializer serializer] requestWithMethod:@"GET" 
URLString:URLString parameters:parameters error:nil];

    URL形式参数编码

    [[AFHTTPRequestSerializer serializer] requestWithMethod:@"POST" 
URLString:URLString parameters:parameters error:nil];

//POST http://example.com/
Content-Type: application/x-www-form-urlencoded
foo=bar&baz[]=1&baz[]=2&baz[]=3

    JSON编码参数

    POST http://example.com/
Content-Type: application/x-www-form-urlencoded
foo=bar&baz[]=1&baz[]=2&baz[]=3

//POST http://example.com/
Content-Type: application/json

{"foo": "bar", "baz": [1,2,3]}

    AFNetworkReachabilityManager

    AFNetworkReachabilityManager
 monitors the reachability of domains, and addresses for both WWAN and WiFi network interfaces.
Do not use Reachability to determine if the original request should be sent.You should try to send it.

You can use Reachability to determine when a request should be automatically retried.Although it may still fail, a Reachability notification that the connectivity is available is a good time to retry something.

Network reachability is a useful tool for determining why a request might have failed.After a network request has failed, telling the user they're offline is better than giving them a more technical but accurate error, such as "request timed out."

See also [WWDC 2012 session 706, "Networking Best Practices."](https://developer.apple.com/videos/play/wwdc2012-706/).

    Shared Network Reachability

    [[AFNetworkReachabilityManager sharedManager] 
setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) { 

NSLog(@"Reachability: %@", AFStringFromNetworkReachabilityStatus(status));
}];

[[AFNetworkReachabilityManager sharedManager] 
startMonitoring];

    安全政策
    afsecuritypolicy评估服务器信任与寄托的X.509证书的公共密钥和安全连接。
    在你的应用程序添加SSL证书有助于防止中间人攻击和其他安全漏洞。处理敏感的客户数据或财务信息应用强烈鼓励所有通信路由的配置和启用HTTPS连接SSL钉扎。
    使无效的SSL证书

    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];

manager.securityPolicy.allowInvalidCertificates = YES; 
// not recommended for production

    用白话说一次：

    AFN
    一、什么是AFN
    全称是AFNetworking，是对NSURLConnection的一层封装
    虽然运行效率没有ASI高，但是使用比ASI简单
    在iOS开发中，使用比较广泛

    AFN的github地址
    https://github.com/pokeb/AFNetworking/AFNetworking

    二、AFN结构
    NSURLConnection
    AFURLConnectionOperation
    AFHTTPRequestOperation
    AFHTTPRequestOperationManager(封装了常用的 HTTP 方法)
    属性
    baseURL :AFN建议开发者针对 AFHTTPRequestOperationManager 自定义个一个单例子类，设置 baseURL, 所有的网络访问，都只使用相对路径即可
    requestSerializer :请求数据格式/默认是二进制的 HTTP
    responseSerializer :响应的数据格式/默认是 JSON 格式
    operationQueue
    reachabilityManager :网络连接管理器

    方法
    manager :方便创建管理器的类方法
    HTTPRequestOperationWithRequest :在访问服务器时，如果要告诉服务器一些附加信息，都需要在 Request 中设置
    GET
    POST

    NSURLSession
    AFURLSessionManager
    AFHTTPSessionManager(封装了常用的 HTTP 方法)
    GET
    POST
    UIKit + AFNetworking 分类
    NSProgress :利用KVO

    半自动的序列化&反序列化的功能
    AFURLRequestSerialization :请求的数据格式/默认是二进制的
    AFURLResponseSerialization :响应的数据格式/默认是JSON格式

    附加功能
    安全策略
    HTTPS
    AFSecurityPolicy

    网络检测
    对苹果的网络连接检测做了一个封装
    AFNetworkReachabilityManager

    三、AFN基本使用

    1.AFHTTPSessionManager
是AFN中最重要的对象之一
封装了HTTP请求的常见处理
GET\POST请求
解析服务器的响应数据

创建AFHTTPSessionManager
AFHTTPSessionManager *mgr = [AFHTTPSessionManager manager];`

AFHTTPSessionManager的GET\POST请求
// GET请求
/* http://120.25.226.186:32812/login?username=520it&pwd=520it 
第一个参数: 请求的地址 http://120.25.226.186:32812/login 
第二个参数: 请求的参数 username=520it&pwd=520it 
第三个参数: 请求成功的回调 第四个参数: 请求失败的回调 只要利用AFN发送请求, 如果服务器返回的是JSON数据, 那么AFN会自动将JSON转会成OC对象返回给我们 
*/
- (NSURLSessionDataTask *)GET:(NSString *)URLString parameters:(id)parameters success:(void (^)(NSURLSessionDataTask *task, id responseObject))success failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure
// POST请求
- (NSURLSessionDataTask *)POST:(NSString *)URLString parameters:(id)parameters success:(void (^)(NSURLSessionDataTask *task, id responseObject))success failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure

    代码示例

    // GET- (void)get2{
 // 1.创建AFN管理者 
AFHTTPSessionManager *manager = [AFHTTPSessionManager manager]; 
// 2.利用AFN管理者发送请求 
NSDictionary *params = @{ @"username" : @"520it", @"pwd" : @"520it" };
 [manager GET:@"http://120.25.226.186:32812/login" parameters:params success:^(NSURLSessionDataTask *task, id responseObject) { 
NSLog(@"请求成功---%@", responseObject); 
} failure:^(NSURLSessionDataTask *task, NSError *error) { 
NSLog(@"请求失败---%@", error);
 }];
}


// POST- (void)post2{ 

// 1.创建AFN管理者 
AFHTTPSessionManager *manager = [AFHTTPSessionManager manager]; 
// 2.利用AFN管理者发送请求 
NSDictionary *params = @{ @"username" : @"520it", @"pwd" : @"520it" };

 [manager POST:@"http://120.25.226.186:32812/login" parameters:params success:^(NSURLSessionDataTask *task, id responseObject) { 
NSLog(@"请求成功---%@", responseObject); 
} failure:^(NSURLSessionDataTask *task, NSError *error) { 
NSLog(@"请求失败---%@", error); 
}];
}

    2.AFHTTPRequestOperationManager
    创建AFHTTPRequestOperationManager

    // 1.创建AFN管理者 
// AFHTTPRequestOperationManager内部包装了NSURLConnection AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];


AFHTTPRequestOperationManager的GET\POST请求
// GET
- (NSURLSessionDataTask *)GET:(NSString *)URLString parameters:(id)parameters success:(void (^)(NSURLSessionDataTask *task, id responseObject))success failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure

// POST请求
- (NSURLSessionDataTask *)POST:(NSString *)URLString parameters:(id)parameters success:(void (^)(NSURLSessionDataTask *task, id responseObject))success failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure

    代码示例

    - (void)get{ 
// 1.创建AFN管理者 
// AFHTTPRequestOperationManager内部包装了NSURLConnection 
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager]; 
// 2.利用AFN管理者发送请求 
NSDictionary *params = @{ @"username" : @"520it", @"pwd" : @"520it" }; 
[manager GET:@"http://120.25.226.186:32812/login" parameters:params success:^(AFHTTPRequestOperation *operation, id responseObject) { 
NSLog(@"请求成功---%@", responseObject);
 } failure:^(AFHTTPRequestOperation *operation, NSError *error) { 
NSLog(@"请求失败---%@", error); }];
}
- (void)post{ 
// 1.创建AFN管理者 
// AFHTTPRequestOperationManager内部包装了NSURLConnection 
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager]; 

// 2.利用AFN管理者发送请求
 NSDictionary *params = @{ @"username" : @"520it", @"pwd" : @"520it" }; 
[manager POST:@"http://120.25.226.186:32812/login" parameters:params success:^(AFHTTPRequestOperation *operation, id responseObject) { 
NSLog(@"请求成功---%@", responseObject);
 } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"请求失败---%@", error); 
}];
}

    四、AFN文件下载

    // 执行下载文件的方法,可以监控下载进度
- (void)downLoadMonitor{ 
// 1.创建网络管理者 
// AFHTTPSessionManager 基于NSURLSession 
AFHTTPSessionManager *manager = [AFHTTPSessionManager manager]; 
// 2.利用网络管理者下载数据 
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://120.25.226.186:32812/resources/videos/minion_02.mp4"]]; 
/* 
destination - targetPath: 系统给我们自动写入的文件路径 - block的返回值, 要求返回一个URL, 返回的这个URL就是剪切的位置的路径 completionHandler - url :destination返回的URL == block的返回的路径 
*/ 

/*
 @property int64_t totalUnitCount; 需要下载文件的总大小 
@property int64_t completedUnitCount; 当前已经下载的大小 
*/ 

NSProgress *progress = nil; 
NSURLSessionDownloadTask *downTask = [manager downloadTaskWithRequest:request progress:&progress destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) { NSString *cachesPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject]; 
NSString *path = [cachesPath stringByAppendingPathComponent:response.suggestedFilename]; 
return [NSURL fileURLWithPath:path]; 
} completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) { 
NSLog(@"%@",filePath.absoluteString);
 }]; 

/* 
要跟踪进度，需要使用 NSProgress，是在 iOS 7.0 推出的，专门用来跟踪进度的类！ NSProgress只是一个对象！如何跟踪进度！-> KVO 对属性变化的监听！ @property int64_t totalUnitCount; 总单位数
@property int64_t completedUnitCount; 完成单位数
*/ 
// 给Progress添加监听 KVO
 [progress addObserver:self forKeyPath:@"completedUnitCount" options:NSKeyValueObservingOptionNew context:nil];
 // 3.启动任务 [downTask resume];}
// 收到通知调用的方法
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(NSProgress *)object change:(NSDictionary *)change context:(void *)context{ NSLog(@"%f",1.0 * object.completedUnitCount / object.totalUnitCount); 
// 回到主队列刷新UI 
dispatch_async(dispatch_get_main_queue(), ^{ self.progress.progress = 1.0 * object.completedUnitCount / object.totalUnitCount; });
}

    五、AFN序列化
    默认是JSON数据，接收类型是JSON
    如果接收的类型和返回的类型不匹配会报错

    // 1.创建AFN管理者

    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager]; 
// 默认请求二进制 
// 默认响应是JSON 
// 告诉AFN，支持接受 text/xml 的数据 
// [AFJSONResponseSerializer serializer].acceptableContentTypes = [NSSet setWithObject:@"text/xml"];
 // 告诉AFN如何解析数据 
// 告诉AFN客户端, 将返回的数据当做JSON来处理，默认的是以JSON处理
// manager.responseSerializer = [AFJSONResponseSerializer serializer]; 
// 告诉AFN客户端, 将返回的数据当做XML来处理
// manager.responseSerializer = [AFXMLParserResponseSerializer serializer];
 // 告诉AFN客户端, 将返回的数据当做而进行来数据 (服务器返回什么就是什么) manager.responseSerializer = [AFHTTPResponseSerializer serializer];

    六、AFN文件上传
    // formData: 专门用于拼接需要上传的数据

    - (NSURLSessionDataTask *)POST:(NSString *)URLString parameters:(id)parameters constructingBodyWithBlock:(void (^)(id <AFMultipartFormData> formData))block success:(void (^)(NSURLSessionDataTask *task, id responseObject))success failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure

    AFN上传文件代码示例

    // 1.创建网络管理者 
AFHTTPSessionManager *manager = [AFHTTPSessionManager manager]; 
// 2.利用网络管理者上传数据 NSDictionary *dict = @{@"username":@"Syl"}; 
// formData: 专门用于拼接需要上传的数据
 [manager POST:@"http://120.25.226.186:32812/upload" parameters:dict constructingBodyWithBlock: ^void(id<AFMultipartFormData> formData) { 
/*
 Data: 需要上传的数据 
name: 服务器参数的名称 
fileName: 文件名称 
mimeType: 文件的类型 
*/ 
UIImage *image =[UIImage imageNamed:@"minion_02"]; 
NSData *data = UIImagePNGRepresentation(image); [formData appendPartWithFileData:data name:@"file" fileName:@"abc.png" mimeType:@"image/png"]; 
/* NSURL *url = [NSURL fileURLWithPath:@"/Users/apple/Desktop/CertificateSigningRequest.certSigningRequest"]; 
// 任意的二进制数据
MIMEType application/octet-stream 
// [formData appendPartWithFileURL:url name:@"file" fileName:@"abc.cer" mimeType:@"application/octet-stream" error:nil]; [formData appendPartWithFileURL:url name:@"file" error:nil]; 
*/ 
} success:^void(NSURLSessionDataTask * task, id responseObject) { 
// 请求成功 NSLog(@"请求成功 %@", responseObject); 
} failure:^void(NSURLSessionDataTask * task, NSError * error) 
{ 
// 请求失败 NSLog(@"请求失败 %@", error);
 }];

    七、监控联网状态
    1.AFN监控联网状态
    联网状态status

    // 2.设置监听
    AFNetworkReachabilityStatusUnknown = -1, 未识别 AFNetworkReachabilityStatusNotReachable = 0, 未连接 AFNetworkReachabilityStatusReachableViaWWAN = 1, 3G AFNetworkReachabilityStatusReachableViaWiFi = 2, wifi

    示例代码

    AFNetworkReachabilityManager *manager = [AFNetworkReachabilityManager sharedManager];
// 提示：要监控网络连接状态，必须要先调用单例的startMonitoring方法[manager startMonitoring];
[manager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus 

2.Reachability监控联网状态苹果提供,导入这两个类使用

// 1.检测wifi状态 
Reachability *wifi = [Reachability reachabilityForLocalWiFi]; 
// 2.检测手机是否能上网络(WIFI\3G\2.5G) 
Reachability *conn = [Reachability reachabilityForInternetConnection]; 
// 3.判断网络状态 if ([wifi currentReachabilityStatus] != NotReachable) { // 有wifi NSLog(@"有wifi"); } else if ([conn currentReachabilityStatus] != NotReachable) { // 没有使用wifi, 使用手机自带网络进行上网 NSLog(@"使用手机自带网络进行上网"); } else { // 没有网络 NSLog(@"没有网络"); }

    ①判断联网状态

    // 用WIFI
// [wifi currentReachabilityStatus] != NotReachable
// [conn currentReachabilityStatus] != NotReachable
// 没有用WIFI, 只用了手机网络
// [wifi currentReachabilityStatus] == NotReachable
// [conn currentReachabilityStatus] != NotReachable
// 没有网络
// [wifi currentReachabilityStatus] == NotReachable
//[conn currentReachabilityStatus] == NotReachable

    ②实时监听网络状态

    #import "ViewController.h"
#import "Reachability.h"
@interface HMViewController ()
@property (nonatomic, strong) Reachability *conn;
@end

@implementation HMViewController

- (void)viewDidLoad
{ 
[super viewDidLoad]; 
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(checkNetworkState) 
name:kReachabilityChangedNotification object:nil]; 

self.conn = [Reachability reachabilityForInternetConnection]; [self.conn startNotifier];
}

- (void)dealloc{ [self.conn stopNotifier]; 
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
- (void)checkNetworkState{ 
// 1.检测wifi状态 
Reachability *wifi = [Reachability reachabilityForLocalWiFi]; 
// 2.检测手机是否能上网络(WIFI\3G\2.5G) 
Reachability *conn = [Reachability reachabilityForInternetConnection]; 
// 3.判断网络状态
 if ([wifi currentReachabilityStatus] != NotReachable) { 
// 有wifi NSLog(@"有wifi"); 
} else if ([conn currentReachabilityStatus] != NotReachable) { 

// 没有使用wifi, 使用手机自带网络进行上网 NSLog(@"使用手机自带网络进行上网");
} else { 
// 没有网络 NSLog(@"没有网络"); 
}}
@end

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