从 URL 加载 UIImage 时在 UITableViewCell 中设置 UIImageView 大小? [英] Set UIImageView Size in UITableViewCell when UIImage loaded from URL?

问题描述

将图像从 URL 加载到 uiimage 中，然后将这些图像添加到 uitableviewcell uiimageview，如下面的代码.我不知道图像大小，但需要在 tableviewcell 图像中强制它们为 40x40.图像在 uitableview 中以不同的宽度不断加载.

Loading images from URL into a uiimage and then adding those images to a uitableviewcell uiimageview, like below code. I do not know the image sizes, but need to force them to be 40x40 in the tableviewcell image. The images keep loading with different widths in the uitableview.

阅读与 uiimage 大小/缩放相关的其他帖子，但这些解决方案对我不起作用.我想这是因为我使用的是 uitableviewcell 中包含的 uiimageview 而不是创建自己的 uiimageview.

Read through other posts related to uiimage sizing/scaling, but those solutions don't work for me. I am thinking it's because I am using the uiimageview included in uitableviewcell vs creating my own uiimageview.

这是代码>

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

UITableViewCell *cell = [[UITableViewCell alloc] init];

ItemForSale *item = [listOfItems objectAtIndex:indexPath.row];
cell.textLabel.text = item.name;
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
cell.textLabel.font = [UIFont systemFontOfSize:14];

NSURL *url = [NSURL URLWithString: item.imgPath];
UIImage *thumbnail = [UIImage imageWithData: [NSData dataWithContentsOfURL:url]];
if (thumbnail == nil) {
    thumbnail = [UIImage imageNamed:@"noimage.png"] ;
}
cell.imageView.image = thumbnail;
cell.imageView.contentMode = UIViewContentModeScaleAspectFill;
cell.imageView.frame = CGRectMake(0, 0, 40, 40);
cell.imageView.autoresizingMask = UIViewAutoresizingNone;
cell.imageView.clipsToBounds = YES;

return cell;

}

我尝试过设置内容模式(尝试了aspectfill 和aspect fit)，尝试重置框架，设置autoresizingmask，clipTobound.没有任何改变.

I've tried setting content mode (tried both aspectfill and aspect fit), tried resetting the frame, setting autoresizingmask, clipTobound. none of it changed a thing.

推荐答案

看苹果示例项目LazyTableImages"找到答案

Found the answer looking at Apples example project "LazyTableImages"

NSURL *url = [NSURL URLWithString: item.imgPath];
UIImage *thumbnail = [UIImage imageWithData: [NSData dataWithContentsOfURL:url]];
if (thumbnail == nil) {
    thumbnail = [UIImage imageNamed:@"noimage.png"] ;
}
CGSize itemSize = CGSizeMake(40, 40);
UIGraphicsBeginImageContext(itemSize);
CGRect imageRect = CGRectMake(0.0, 0.0, itemSize.width, itemSize.height);
[thumbnail drawInRect:imageRect];
cell.imageView.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

return cell;

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