Question

在我的应用中，需要将多个图像上传到服务器。当我们将图像上传到服务器一个或一个所有图像时。

基本问题是。

app将图像上传到服务器时消耗大量内存。
上传图片后应用未消失的内存。

这是将图像上传到服务器的代码。使用简单的AFNetwortking。

-(void) uploadImageToServerOneByOne:(int)count andImage:(UIImage*)img         {
NSMutableDictionary *parem_dict;

if (parem_dict == nil) {
    parem_dict = [[NSMutableDictionary alloc]init];
}

[parem_dict setObject:@"jpeg" forKey:@"extension"];
[parem_dict setObject:@706 forKey:@"order_id"];
[parem_dict setObject:@"gallary" forKey:@"image_type"];
[parem_dict setObject:@(count+1) forKey:@"count"];
[parem_dict setObject:@(1) forKey:@"product_id"];
[parem_dict setObject:@"SNAPBOOK" forKey:@"type"];

manager.requestSerializer.timeoutInterval = 1200 ;
manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/plain"];
[manager POST:@"http://52.42.247.73:8080/anaventures/image/upload" parameters:parem_dict constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {

    [formData appendPartWithFileData:UIImageJPEGRepresentation(img, 0.5) name:@"file" fileName:@"filename.jpg" mimeType:@"image/jpeg"];

    [parem_dict removeAllObjects];
    formData = nil;

} progress:^(NSProgress * _Nonnull uploadProgress) {
    NSLog(@"%f",uploadProgress.fractionCompleted);

} success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
    [MyLoader hideLoadingView];
    if (count + 1 < imageArray.count) {

        [self uploadImageToServerOneByOne:count +1 andImage:imageArray[count+1]];

    }else{

        [MyLoader hideLoadingView];

        NSLog(@" image successfully uploaded  -------- ohhhhhhhhooooooooooo!");

    }
    NSLog(@"success");

} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {

    [MyLoader hideLoadingView];
    NSLog(@"fail%@", error.localizedDescription);
}];
}

提前致谢

Answer 1

您的问题是您没有使用异步方法上传图片。

我向您展示了一个上传图片方法和示例：

Util method:
+ (void)uploadImage:(UIImage *)image withUrl:(NSString *)uploadUrl withBlock:(void (^)(NSString *))returnUrl {

UIImage *img = image;

//UIImage *com_img = [Util compressImage:img toMaxFileSize:25 * 1000];  // max is 250kb   // 50 *1000 :333759

UIImage *com_img_before = [Util imageCompressForWidth:img targetWidth:80];

UIImage *com_img = [Util compressImage:com_img_before toMaxFileSize:25 * 1000];

//NSData *dataObj = UIImagePNGRepresentation(com_img);

NSData *dataObj;
if (UIImagePNGRepresentation(com_img) == nil) {

    dataObj = UIImageJPEGRepresentation(com_img, 1);

} else {

    dataObj = UIImagePNGRepresentation(com_img);
}



NSDictionary * param1 = @{
                          @"id":@1,
                          @"imgFile":dataObj
                          };
AFHTTPSessionManager * session = [AFHTTPSessionManager manager];
session.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json",@"application/xml",@"text/json",@"text/javascript",@"text/html",@"text/plain",@"multipart/form-data",nil];

//url
NSString *url = [NSString stringWithFormat:@"%@%@", BASE_URL, uploadUrl]; // uploadHeader  uploadImages

[session POST:url parameters:param1 constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {

    UIImage *img = image; // response
    NSData *data = UIImagePNGRepresentation(img);

    // schoolListItem@2x
    [formData appendPartWithFileData:data name:@"imgFile" fileName:@"imgFile.png"mimeType:@"image/png"];
} success:^(NSURLSessionDataTask * _Nonnull task, id  _Nonnull responseObject) {

    NSLog(@"success+%@", responseObject);
    NSString *return_url = [NSString stringWithFormat:@"%@",responseObject[@"data"]]; //
    // pass data by block
    returnUrl(return_url);



} failure:^(NSURLSessionDataTask * _Nonnull task, NSError * _Nonnull error) {
    NSLog(@"fail");
}];


}


 USAGE:

 [MBProgressHUD showHUDAddedTo:self.view animated:YES];
        __block int comemntCount = 0;

        NSString *url = @"prescription/uploadImages"; // the uplad url

        static dispatch_once_t onceToken;
        static dispatch_semaphore_t semaphore;  // sema 
        static dispatch_queue_t queue;

        dispatch_once(&onceToken, ^{
            semaphore = dispatch_semaphore_create(1);
            //queue = dispatch_queue_create("com.MyApp.task", NULL);
            queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);  
        });


        for (int i = 0; i < _selectedAssets.count; i ++) {  //_photosChooseArr

            dispatch_async(queue, ^{

                dispatch_semaphore_wait(semaphore,  DISPATCH_TIME_FOREVER);
                [Util uploadImage:_selectedPhotos[i] withUrl:url withBlock:^(NSString *returnUrl) {

                    if (i == 0) {
                        files = returnUrl;
                        comemntCount ++;
                        if (comemntCount == _selectedAssets.count) {
                            [MBProgressHUD hideHUDForView:self.view animated:YES];
                            [self doUploadMessageWithFiles:files];

                        }
                    }else { 

                        files = [files stringByAppendingString:[NSString stringWithFormat:@",%@", returnUrl]];
                        comemntCount ++;

                        if (comemntCount == _selectedAssets.count) {
                            [MBProgressHUD hideHUDForView:self.view animated:YES];
                            [self doUploadMessageWithFiles:files];
                            NSLog(@"i = %d, returnUrl = %@, files = %@", i, returnUrl, files);
                        }
                    }

                    dispatch_semaphore_signal(semaphore);

                }];

            });

        }



        /* 3 min after hide the hud  */
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(180.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            // 60s after close the hud
            [MBProgressHUD hideHUDForView:self.view animated:YES];
        });

这是我上传图像数组的方法，你可以复制到你的项目进行研究，希望对你有帮助。

将多个图像上传到服务器

1 个答案: