Iphone在加载列表时,如果每个等待把所有列表中的数据都加载完在显示相关内容,如果列表中有一些比较大的图片,加载的时间比较长,那么给用户的效果就很差了,下面详细是一种实现动态加载图片的办法:
-(UITableViewCell*)tableView:(UITableView*)tableView
cellForRowAtIndexPath:(NSIndexPath*)indexPath {
UITableViewCell* cell =[tableView dequeueReusableCellWithIdentifier:@"tag"];
if(cell==nil){
cell =[[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle
reuseIdentifier:@"tag"] autorelease];
}
//表格设计
NSDictionary* one =[array objectAtIndex:indexPath.row];
cell.textLabel.text =[one objectForKey:@"title"];
cell.detailTextLabel.text =[one objectForKey:@"content"];
[NSThread detachNewThreadSelector:@selector(updateImageForCellAtIndexPath:) toTarget:self withObject:indexPath];
return cell;
}
-(void)updateImageForCellAtIndexPath:(NSIndexPath*)indexPath
{
NSAutoreleasePool*pool =[[NSAutoreleasePool alloc] init];
UIImage*image =[self getImageForCellAtIndexPath:indexPath];
UITableViewCell*cell =[self.tableView cellForRowAtIndexPath:indexPath];
[cell.imageView performSelectorOnMainThread:@selector(setImage:) withObject:image waitUntilDone:NO];
[image release];
[pool release];
}
-(UIImage*)getImageForCellAtIndexPath:(NSIndexPath*)indexPath
{
id path =[[array objectAtIndex:indexPath.row] objectForKey:@"image"];
NSURL *url =[NSURL URLWithString:path];
NSData*data =[NSData dataWithContentsOfURL:url];
UIImage*image =[[UIImage alloc] initWithData:data cache:NO];
return image;
}
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