业务需求

1、服务端提供单张上传的接口。
2、客户端需求同时提交多张图片上传。
3、使用AFNetWorking 或 自封装的带有block回调网络状态的框架。

思路分析

1，创建一个管理类。
2，提供一个单例方法。保证管理类唯一
3，提供一个公共方法，传入多张图片必要的参数和文件。
4，在管理类中创建一个全局计数变量，用来统计当前完成的请求（无论成功与失败）。
5，在管理类中创建两个数组（1，存放成功后的回调数据model。2，存放失败后的回调数据model）
6，公共方法中使用for循环，一次性创建多个请求（参数传递看自己情况，保证准确）。
7，在成功回调和失败会掉中都将全局计数变量＋1，分别在两个数组中存放数据model，并判断是否和预期的请求数相等，如果是就调用代理方法或者block 将两个数组回传。
8，在接收回调的类中处理两个数组。

实现代码

• BCatUploadRequestMgr.h

#import <Foundation/Foundation.h>
@class BCatGetLendUploadListsModel;

extern NSString * const  BCatUploadRequestMgr_doUploadResultBlock;

/**
 *  上传队列结束后的统计block
 *
 *  @param successNum    成功的个数
 *  @param failNum       失败的个数
 *  @param successModels 成功的models （imagePath有值）
 *  @param failModels    失败的models  (原model)
 */
typedef void (^ BCatUploadRequestMgrUploadResultBlock) (NSInteger successNum , NSInteger failNum, NSArray * successModels , NSArray * failModels);

@interface  BCatUploadRequestMgr : NSObject

@property (nonatomic , strong)  BCatUploadRequestMgrUploadResultBlock uploadResultBlock;

+ (instancetype)share;

/**
 *  上传附件，model中的imagedata必需有值
 *
 *  @param models NSArray< BCatGetLendUploadListsModel *>
 *  @param uploadResultBlock 执行队列结束后的结果统计
 */
- (void)uploadImagesWithModels:(NSArray *)models uploadResultBlock:( BCatUploadRequestMgrUploadResultBlock)uploadResultBlock;

@end

• BCatUploadRequestMgr.m

#import "BCatUploadRequestMgr.h"
#import "BCatGetLendUploadListsModel.h"
#import "BCatUpdateLendUploadsInfoRequest.h"
#import "BCatCreditInfoModelMgr.h"

#define BOUNDARY @"AaB03x" //设置边界 参数可以随便设置


NSString * const BCatUploadRequestMgr_doUploadResultBlock = @"BCatUploadRequestMgr_doUploadResultBlock";

@interface BCatUploadRequestMgr()

@property (nonatomic , assign) __block NSInteger successNum; //记录成功上传的附件数
@property (nonatomic , assign) __block NSInteger failNum; //记录上传失败的附件数
@property (nonatomic , strong) __block NSMutableArray * successModels; //存放成功上传的models
@property (nonatomic , strong) __block NSMutableArray * failModels; //存放失败上传的models
@property (nonatomic , assign) NSInteger sumNum; //models 的总数目

@end

@implementation BCatUploadRequestMgr
+ (instancetype)share {
    static BCatUploadRequestMgr * mgr = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        mgr = [[BCatUploadRequestMgr alloc] init];
    });
    return mgr;
}

- (instancetype)init
{
    self = [super init];
    if (self) {
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(doUploadResultBlock) name:BCatUploadRequestMgr_doUploadResultBlock object:nil];
    }
    return self;
}

- (void)configParamters {
    self.successNum = 0;
    self.failNum = 0;
    self.sumNum = 0;
    self.successModels = [[NSMutableArray alloc] init];
    self.failModels = [[NSMutableArray alloc] init];
}

//回调
- (void)doUploadResultBlock {
    if (self.uploadResultBlock) {
        self.uploadResultBlock(self.successNum,self.failNum,self.successModels,self.failModels);
    }
}


//检查是否可以回调
- (void)doCheckDoUploadResultBlock {
    if (self.successNum + self.failNum == self.sumNum) {
        [[NSNotificationCenter defaultCenter] postNotificationName:BCatUploadRequestMgr_doUploadResultBlock object:nil];
    }
}

- (void)uploadImagesWithModels:(NSArray *)models uploadResultBlock:(BCatUploadRequestMgrUploadResultBlock)uploadResultBlock {
    self.uploadResultBlock = uploadResultBlock;
    [self configParamters];
    self.sumNum = models.count;
    for (BCatGetLendUploadListsModel *model in models) {


        __block BCatGetLendUploadListsModel * tmpModel = model;


        BCatUpdateLendUploadsInfoRequest * request = [[BCatUpdateLendUploadsInfoRequest alloc] initWithLenRequestId:[model.lendRequestId stringValue]
                                                                                                 attachmentType:model.attachmentType
                                                                                                      imageData:model.imageData
                                                                                                       fileName:[[BCatCreditInfoModelMgr share] getUserIdAddTimeStr]
                                                                                                   attachmentId:model.attachmentId];
        [request startWithCompletionSuccess:^(__kindof BSRequest * _Nullable request) {
            BCatUploadAttachmentModel * attachMentModel = (BCatUploadAttachmentModel *)request.responseModel.data;
            tmpModel.attachmentPath = attachMentModel.attachmentPath;
            tmpModel.type = BCatGetLendUploadListsModelPhotosType;
            tmpModel.lendRequestId = model.lendRequestId;
            tmpModel.attachmentType = model.attachmentType;
            tmpModel.iD = [NSNumber numberWithInteger:[model.attachmentId integerValue]];
            [self.successModels addObject:tmpModel];
            [self.lock lock];
            self.successNum++;
            [self.lock unlock];
            [self doCheckDoUploadResultBlock];
        } failure:^(__kindof BSRequest * _Nullable request) {
            tmpModel.type = BCatGetLendUploadListsModelPhotosType;
            tmpModel.iD = [NSNumber numberWithInteger:[model.attachmentId integerValue]];
            tmpModel.attachmentType = model.attachmentType;
            tmpModel.lendRequestId = model.lendRequestId;

            [self.failModels addObject:tmpModel];
            [self.lock lock];
            self.failNum++;
            [self.lock unlock];
            [self doCheckDoUploadResultBlock];
        }];
    }
}