最近在做圖片上傳的功能，使用的AFNetworking提供的方法上傳圖片，發(fā)現(xiàn)多張圖片時總是只有一張圖片上傳到后臺。

有問題的上傳代碼為：

特別提醒：

創(chuàng)建AFHTTPsessionManager時，直接使用[AFHTTPSessionManager manager]會造成內(nèi)存泄漏，需要實現(xiàn)單列方法，可參看AFNetworking的Demo

        AFHTTPSessionManager *manager = [TPHTTPTool sharedHTTPManager];        manager.responseSerializer = [AFJSONResponseSerializer serializer];        //設(shè)置響應(yīng)頭可以接收的content-type        NSMutableSet *tempSet = [manager.responseSerializer.acceptableContentTypes mutableCopy];        [tempSet addObjectsFromArray:@[@"text/html"]];        manager.responseSerializer.acceptableContentTypes = [tempSet copy];        [manager POST:URL_detailPatientUpdate parameters:params constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {            for(NSInteger i = 0; i < images.count; i++){                //取出單張圖片二進制數(shù)據(jù)                id obj = images[i];                UIImage *image = nil;                if ([obj isKindOfClass:[UIImage class]]) {                    image = (UIImage *)obj;                }else{                    image = [UIImage imageWithContentsOfFile:obj];                }                if (image) {                    NSData *imageData = [TPDataTool dataWithImage:image maxKB:500.0f];                    NSLog(@"圖片大小:%ld K" , (long)imageData.length / 1024);                    // 上傳filename                    NSString *fileName = [NSString stringWithFormat:@"image_%ld.jpg", (long)blockI];                    [formData appendPartWithFileData:imageData name:@"file" fileName:fileName mimeType:@"image/jpeg"];                }            }        } PRogress:^(NSProgress * _Nonnull uploadProgress) {                    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responSEObject) {                    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {                    }];
找后臺調(diào)試后發(fā)現(xiàn)，通過上面的方法上傳多張圖片，實際上只有一張被傳到后臺，可能的原因是：
上傳多張圖片時，由于url的參數(shù)沒有變化，iOS默認是同一個請求，只發(fā)送了一次請求給后臺，故后臺只收到一張圖片。
解決辦法是將循環(huán)把整個請求方法都包起來。代碼為：
// 上傳多張圖片    for(NSInteger i = 0; i < images.count; i++)    {        AFHTTPSessionManager *manager = [TPHTTPTool sharedHTTPManager];        manager.responseSerializer = [AFJSONResponseSerializer serializer];        //設(shè)置響應(yīng)頭可以接收的content-type        NSMutableSet *tempSet = [manager.responseSerializer.acceptableContentTypes mutableCopy];        [tempSet addObjectsFromArray:@[@"text/html"]];        manager.responseSerializer.acceptableContentTypes = [tempSet copy];        __block NSInteger blockI = i;        [manager POST:URL_detailPatientUpdate parameters:params constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {            //取出單張圖片二進制數(shù)據(jù)            id obj = images[blockI];            UIImage *image = nil;            if ([obj isKindOfClass:[UIImage class]]) {                image = (UIImage *)obj;            }else{                image = [UIImage imageWithContentsOfFile:obj];            }            if (image) {                NSData *imageData = [TPDataTool dataWithImage:image maxKB:500.0f];                NSLog(@"圖片大小:%ld K" , (long)imageData.length / 1024);                // 上傳filename                NSString *fileName = [NSString stringWithFormat:@"image_%ld.jpg", (long)blockI];                [formData appendPartWithFileData:imageData name:@"file" fileName:fileName mimeType:@"image/jpeg"];            }        } progress:^(NSProgress * _Nonnull uploadProgress) {                    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {                    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {                   }];}