Question

我有一个CollectionView，在CollectionView单元格中，它有一个UIImageView。我使用AFNetworking从Web服务加载图像。但是加载数据需要花费更多的时间。有什么办法可以加快这个过程。我附上了我的代码。希望你的帮助。

//加载数据

- (void)loadcategoryData
{
    post = nil;
    NSString *mainurl = [NSString stringWithFormat:@"some url"];
    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    manager.responseSerializer.acceptableContentTypes = [manager.responseSerializer.acceptableContentTypes setByAddingObject:@"text/html"];
    [manager GET:mainurl parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {

        posts = (NSDictionary *)responseObject;
        post = [NSMutableArray array];
        for(NSDictionary *all in posts)
        {
            Categories *category = [Categories new];
            category.title = [all objectForKey:@"catname"];
            category.firsturl = [all objectForKey:@"url"];

            [self.maincollectionView reloadData];
            //call for images

            imagespost = nil;
            NSString *imageUrl = [NSString stringWithFormat:@"%@", category.firsturl];
            AFHTTPRequestOperationManager *managerone = [AFHTTPRequestOperationManager manager];
            [managerone GET:imageUrl parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {



                imagesposts = (NSDictionary *)responseObject;
                NSArray *resultone = [imagesposts objectForKey:@"posts"];
                imagespost = [NSMutableArray array];
                if ([resultone count]) {
                    NSDictionary *firstpost = resultone[0];
//                    Categories *newmogocat = [Categories new];

                    NSDictionary *thumbnail_images = [firstpost objectForKeyedSubscript:@"thumbnail_images"];
                    NSDictionary *thumbnail = [thumbnail_images objectForKey:@"thumbnail"];
                    category.imageOneUrl = [NSString stringWithFormat:@"%@",[thumbnail objectForKey:@"url"]];
//                    NSLog(@"%@", newmogocat.imageOneUrl);
//                    [imagespost addObject:newmogocat];

                    [post addObject:category];

                    [self.maincollectionView reloadData];
                }

            } failure:^(AFHTTPRequestOperation *operation, NSError *error) {

            }];


        }

    } failure:^(AFHTTPRequestOperation *operation, NSError * responseObject) {

    }];
}

//将值分配给collectionview单元格

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    CategoryCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"cellidentifier" forIndexPath:indexPath];
//    cell.layer.borderWidth = 2.0f;
    cell.layer.masksToBounds = NO;
    cell.layer.cornerRadius = 5.0;
    cell.layer.borderColor = [UIColor purpleColor].CGColor;
    cell.layer.shadowOffset = CGSizeMake(0, 1);
    cell.layer.shadowRadius = 2.0;
    cell.layer.shadowColor = [UIColor blueColor].CGColor;


    [cell addSubview:cell.maintitleLabel];

    Categories *cat = [post objectAtIndex:indexPath.row];
    [self.maincollectionView reloadInputViews];
    cell.maintitleLabel.text = [NSString stringWithFormat:@" %@ ", cat.title];
    [cell.maintitleLabel sizeToFit];






    NSString *mainstring = [NSString stringWithFormat:@"%@", cat.imageOneUrl];
    NSURL *url = [NSURL URLWithString:mainstring];
//    NSLog(@"%@", mainstring);


    [cell.mainImageView setImageWithURL:url placeholderImage:nil];




    return cell;
}

Answer 1

导入“UIImage + AfNetworking.h”

内部- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath

NSURLRequest *req = [NSURLRequest requestWithURL:[NSURL URLWithString:cat.imageOneUrl]];
[EDIT] : 
 __weak CategoryCollectionViewCell *weakCell = cell; [EDIT]
[cell.articleThumbnail setImageWithURLRequest:req placeholderImage:[UIImage imageNamed:@"placeholder.png"] success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {
   [EDIT] weakCell.articleThumbnail.image = image;
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {
    [EDIT] weakCell.articleThumbnail.image = [UIImage imageNamed:@"placeholder.png"];
}];

希望这有帮助

如何在iOS中使用AFNetworking提高将图像加载到UIImageView的速度

1 个答案: