基於AFN 3.0 封裝（包括圖片與視頻的表單上傳）

1、首先將AFN最新的包導入工程，可以使用cocopods。
2、新建一個類，我的類名GlobalNetWorking。首先封裝了一下判斷是否有網，具體代碼如下
GlobalNetWorking.h

#import <Foundation/Foundation.h>
#import "AFNetworking.h"
@interface GlobalNetWorking : NSObject
//判斷是否有網絡
+(BOOL)isHasNetwork;

GlobalNetWorking.m中實現：

+(AFNetworkReachabilityStatus)currentNetworkStatus{
    static AFNetworkReachabilityStatus currentNetworkStatus = AFNetworkReachabilityStatusUnknown;
    static dispatch_once_t predicate;
    dispatch_once(&predicate, ^{
       /*
        AFNetworkReachabilityStatusUnknown          = -1,  // 未知
        AFNetworkReachabilityStatusNotReachable     = 0,   // 無連接
        AFNetworkReachabilityStatusReachableViaWWAN = 1,   // 移動網絡
        AFNetworkReachabilityStatusReachableViaWiFi = 2,   // WiFi
        */
        [[AFNetworkReachabilityManager sharedManager] startMonitoring];
        [[AFNetworkReachabilityManager sharedManager] setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
            currentNetworkStatus = status;
        }];
    });
    return currentNetworkStatus;
}
+(BOOL)isHasNetwork{
    BOOL flag = YES;
    AFNetworkReachabilityStatus statue = [self currentNetworkStatus];
    //無連接或未知錯誤返回NO
    if (statue == AFNetworkReachabilityStatusUnknown || statue == AFNetworkReachabilityStatusNotReachable) {
        flag = NO;
    }
    return flag;
}

3、普通post網絡請求。
GlobalNetWorking.h中：

//普通post網絡請求
+(void)networkWithPhpStr:(NSString *)phpStr andParametersString:(NSString *)parameters andSuccess:(void (^)(id rootObject, id datasObject, bool isSuccess))success andFailure:(void (^)(NSError *error))failure;//這裏的phpStr是後臺接口鏈接的固定拼接，parameters是傳給後臺數據字段的拼接。這裏可以直接改成url和裝有數據的字典。

GlobalNetWorking.m中
這裏的+(NSDictionary *)createPostParameterDictionaryWithUrlString:(NSString *)urlStr；這個類方法是將我上面所說的傳給後臺數據拼接的parameters字符串轉化爲字典。（所以這一步在上面可以省略，直接傳入字典。）

#pragma mark - 解析生成post參數
+(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];
    //這裏[NSString stringWithFormat:@"%@%@",HTTP_AFNETWORKING_POST_URL,phpStr]是請求的URL。在項目中進行了封裝，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];
        //成功後進行解析，因爲我所做項目中都會包含一個data字段，所以這裏進行這麼判斷，這裏的使用需要根據後臺反饋的數據而定。
        if (!rootDic || ![rootDic isKindOfClass:[NSDictionary class]] || ![rootDic.allKeys containsObject:@"data"]) {
            NSError * error = [[NSError alloc] initWithDomain:@"datasError" code:ErrorCodeNoDatasKey userInfo:@{NSLocalizedDescriptionKey:@"網絡請求返回值沒有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、進行圖片上傳的封裝。
首先看一下我這裏的需求：需要進行表單上傳，其次是多張圖片需要放在數組中。
代碼如下：
GlobalNetWorking.h中：

//圖片上傳
+(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中具體實現：

+(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
             /*
             此方法參數
             1. 要上傳的[二進制數據]
             2. 對應網站上[upload.php中]處理文件的[字段"file"]
             3. 要保存在服務器上的[文件名]
             4. 上傳文件的[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:@"網絡請求返回值沒有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、視頻上傳的方法
視頻上傳和圖片上傳大同小異。具體如下：
GlobalNetWorking.h中：
這裏我將video轉換成NSData進行上傳的。

//視頻上傳
+(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中具體實現：

+(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:@"網絡請求返回值沒有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 的簡單的再次封裝。如果有什麼問題請留言，有錯請指出，謝謝。