基于AFN 3.0 封装（包括图片与视频的表单上传）

1、首先将AFN最新的包导入工程，可以使用cocopods。
2、新建一个类，我的类名GlobalNetWorking。首先封装了一下判断是否有网，具体代码如下
GlobalNetWorking.h

#import <Foundation/Foundation.h>#import "AFNetworking.h"@interface GlobalNetWorking : NSObject//判断是否有网络+(BOOL)isHasNetwork;

GlobalNetWorking.m中实现：

+(AFNetworkReachabilityStatus)currentNetworkStatus{    static AFNetworkReachabilityStatus currentNetworkStatus = AFNetworkReachabilityStatusUnknown;    static dispatch_once_t predicate;    dispatch_once(&predicate, ^{       /*        AFNetworkReachabilityStatusUnknown          = -1,  // 未知        AFNetworkReachabilityStatusNotReachable     = 0,   // 无连接        AFNetworkReachabilityStatusReachableViaWWAN = 1,   // 移动网络        AFNetworkReachabilityStatusReachableViaWiFi = 2,   // WiFi        */        [[AFNetworkReachabilityManager sharedManager] startMonitoring];        [[AFNetworkReachabilityManager sharedManager] setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {            currentNetworkStatus = status;        }];    });    return currentNetworkStatus;}+(BOOL)isHasNetwork{    BOOL flag = YES;    AFNetworkReachabilityStatus statue = [self currentNetworkStatus];    //无连接或未知错误返回NO    if (statue == AFNetworkReachabilityStatusUnknown || statue == AFNetworkReachabilityStatusNotReachable) {        flag = NO;    }    return flag;}

3、普通post网络请求。
GlobalNetWorking.h中：

//普通post网络请求+(void)networkWithPhpStr:(NSString *)phpStr andParametersString:(NSString *)parameters andSuccess:(void (^)(id rootObject, id datasObject, bool isSuccess))success andFailure:(void (^)(NSError *error))failure;//这里的phpStr是后台接口链接的固定拼接，parameters是传给后台数据字段的拼接。这里可以直接改成url和装有数据的字典。

GlobalNetWorking.m中
这里的+(NSDictionary *)createPostParameterDictionaryWithUrlString:(NSString *)urlStr；这个类方法是将我上面所说的传给后台数据拼接的parameters字符串转化为字典。（所以这一步在上面可以省略，直接传入字典。）

#pragma mark - 解析生成post参数+(NSDictionary *)createPostParameterDictionaryWithUrlString:(NSString *)urlStr{    if (!urlStr || ![urlStr isKindOfClass:[NSString class]]) {        return nil;    }    NSArray *tmpAndArray = [urlStr componentsSeparatedByString:@"&"];    NSMutableDictionary *tmpDic = [[NSMutableDictionary alloc] init];    for (NSString *tmpString in tmpAndArray) {        if (![tmpString isKindOfClass:[NSString class]]) {            continue;        }         NSArray *tmpEqualArray = [tmpString componentsSeparatedByString:@"="];        if (tmpEqualArray.count == 2) {            NSString *tmpKey = [NSString stringWithFormat:@"%@", tmpEqualArray[0]];            NSString *tmpValue = [NSString stringWithFormat:@"%@", tmpEqualArray[1]];            [tmpDic setValue:tmpValue forKey:tmpKey];        }    }    return tmpDic;}+(void)networkWithPhpStr:(NSString *)phpStr andParametersString:(NSString *)parameters andSuccess:(void (^)(id rootObject, id datasObject, bool isSuccess))success andFailure:(void (^)(NSError *error))failure{    AFHTTPSessionManager *sessionManager = [AFHTTPSessionManager manager];    sessionManager.responseSerializer = [AFHTTPResponseSerializer serializer];    NSDictionary *params = [self createPostParameterDictionaryWithUrlString:parameters];    //这里[NSString stringWithFormat:@"%@%@",HTTP_AFNETWORKING_POST_URL,phpStr]是请求的URL。在项目中进行了封装，方便管理。    [sessionManager POST:[NSString stringWithFormat:@"%@%@",HTTP_AFNETWORKING_POST_URL,phpStr] parameters:params progress:^(NSProgress * _Nonnull uploadProgress) {    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {        NSDictionary *rootDic = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableContainers error:nil];        //成功后进行解析，因为我所做项目中都会包含一个data字段，所以这里进行这么判断，这里的使用需要根据后台反馈的数据而定。        if (!rootDic || ![rootDic isKindOfClass:[NSDictionary class]] || ![rootDic.allKeys containsObject:@"data"]) {            NSError * error = [[NSError alloc] initWithDomain:@"datasError" code:ErrorCodeNoDatasKey userInfo:@{NSLocalizedDescriptionKey:@"网络请求返回值没有datas字段!"}];            failure(error);            return;        }        id datasValue = [rootDic objectForKey:@"data"];        BOOL isSuccess = [[rootDic valueForKey:@"status"] boolValue];        success(rootDic,datasValue,isSuccess);    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {        failure(error);    }];}

4、进行图片上传的封装。
首先看一下我这里的需求：需要进行表单上传，其次是多张图片需要放在数组中。
代码如下：
GlobalNetWorking.h中：

//图片上传+(void)uploadImageWithPhpStr:(NSString *)phpStr andParametersString:(NSString *)parameters andImageArray:(NSArray *)imageArray andSuccess:(void (^)(id rootObject, id datasObject, bool isSuccess))success andFailure:(void (^)(NSError *error))failure;

GlobalNetWorking.m中具体实现：

+(void)uploadImageWithPhpStr:(NSString *)phpStr andParametersString:(NSString *)parameters andImageArray:(NSArray *)imageArray andSuccess:(void (^)(id, id, bool))success andFailure:(void (^)(NSError *))failure{    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];    manager.responseSerializer = [AFHTTPResponseSerializer serializer];    NSDictionary *params = [self createPostParameterDictionaryWithUrlString:parameters];    NSLog(@"%@",params);    [manager POST:[NSString stringWithFormat:@"%@%@",HTTP_AFNETWORKING_POST_URL,phpStr] parameters:params constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {        NSUInteger i = 0 ;        for (UIImage *image in imageArray) {            NSData * imgData = UIImageJPEGRepresentation(image, .5);            //拼接data             /*             此方法参数             1. 要上传的[二进制数据]             2. 对应网站上[upload.php中]处理文件的[字段"file"]             3. 要保存在服务器上的[文件名]             4. 上传文件的[mimeType]             */            [formData appendPartWithFileData:imgData name:[NSString stringWithFormat:@"pic[%ld]",(long)i] fileName:@"image.png" mimeType:@"image/jpg"];            i++;        }    } progress:^(NSProgress * _Nonnull uploadProgress) {    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {        NSDictionary *rootDic = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableContainers error:nil];        if (!rootDic || ![rootDic isKindOfClass:[NSDictionary class]] || ![rootDic.allKeys containsObject:@"data"]) {            NSError * error = [[NSError alloc] initWithDomain:@"datasError" code:ErrorCodeNoDatasKey userInfo:@{NSLocalizedDescriptionKey:@"网络请求返回值没有data字段!"}];            failure(error);            return;        }        id datasValue = [rootDic objectForKey:@"data"];        BOOL isSuccess = [[rootDic valueForKey:@"status"] boolValue];        success(rootDic,datasValue,isSuccess);    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {        failure(error);    }];}

5、视频上传的方法
视频上传和图片上传大同小异。具体如下：
GlobalNetWorking.h中：
这里我将video转换成NSData进行上传的。

//视频上传+(void)uploadVideoWithPhpStr:(NSString *)phpStr andParametersString:(NSString *)parameters andVideoData:(NSData *)videoData andSuccess:(void (^)(id rootObject, id datasObject, bool isSuccess))success andFailure:(void (^)(NSError *error))failure;

GlobalNetWorking.m中具体实现：

+(void)uploadVideoWithPhpStr:(NSString *)phpStr andParametersString:(NSString *)parameters andVideoData:(NSData *)videoData andSuccess:(void (^)(id, id, bool))success andFailure:(void (^)(NSError *))failure{    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];    manager.responseSerializer = [AFHTTPResponseSerializer serializer];    NSDictionary *params = [self createPostParameterDictionaryWithUrlString:parameters];    NSLog(@"%@",params);    [manager POST:[NSString stringWithFormat:@"%@%@",HTTP_AFNETWORKING_POST_URL,phpStr] parameters:params constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {        [formData appendPartWithFileData:videoData name:@"video" fileName:@"video.mp4" mimeType:@"video/mp4"];    } progress:^(NSProgress * _Nonnull uploadProgress) {    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {        NSDictionary *rootDic = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableContainers error:nil];        if (!rootDic || ![rootDic isKindOfClass:[NSDictionary class]] || ![rootDic.allKeys containsObject:@"data"]) {            NSError * error = [[NSError alloc] initWithDomain:@"datasError" code:ErrorCodeNoDatasKey userInfo:@{NSLocalizedDescriptionKey:@"网络请求返回值没有data字段!"}];            failure(error);            return;        }        id datasValue = [rootDic objectForKey:@"data"];        BOOL isSuccess = [[rootDic valueForKey:@"status"] boolValue];        success(rootDic,datasValue,isSuccess);    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {        failure(error);    }];}

以上就是AFN 3.0 的简单的再次封装。如果有什么问题请留言，有错请指出，谢谢。