问题描述
我正在使用 iOS 5.0 SDK 和 XCode 4.2 开发 iOS 4 应用程序.
I'm developing an iOS 4 application with iOS 5.0 SDK and XCode 4.2.
我必须将一些帖子博客显示到 UITableView 中.当我检索到所有 Web 服务数据时,我使用此方法创建一个 UITableViewCell:
I have to show some post blogs into a UITableView. When I have retreived all web service data, I use this method to create an UITableViewCell:
- (BlogTableViewCell *)tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString* cellIdentifier = @"BlogCell";
BlogTableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (cell == nil)
{
NSArray* topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"BlogTableViewCell" owner:nil options:nil];
for(id currentObject in topLevelObjects)
{
if ([currentObject isKindOfClass:[BlogTableViewCell class]])
{
cell = (BlogTableViewCell *)currentObject;
break;
}
}
}
BlogEntry* entry = [blogEntries objectAtIndex:indexPath.row];
cell.title.text = entry.title;
cell.text.text = entry.text;
cell.photo.image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:entry.photo]]];
return cell;
}
但是这一行:
cell.photo.image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:entry.photo]]];
太慢了(entry.photo 有一个 http url).
it is so slow (entry.photo has a http url).
有没有办法异步加载该图像?我认为这很困难,因为 tableView:cellForRowAtIndexPath 经常被调用.
Is there any way to load that image asynchronously? I think it is difficult because tableView:cellForRowAtIndexPath is called very often.
推荐答案
看一看 SDWebImage:
Take a look at SDWebImage:
https://github.com/rs/SDWebImage
这是一组很棒的类,可以为您处理所有事情.
It's a fantastic set of classes that handle everything for you.
蒂姆
这篇关于将图像异步加载到 UIImage 中的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!