Question

我的TableView的每个单元格都包含UIImage，我做了一个动作来更改每个单元格中UIImage中的所有图像，然后重新加载表格。
在我滚动表格之前，图像没有改变我知道TableView在滚动期间正在加载单元格但有没有办法解决我的问题？

由于

Answer 1

确保从MainThread中呼叫reloadData或beingUpdates / endUpdates。您可以通过以下方式查看：

if (![NSThread mainThread]) {
    return;
}

这是一个例子。 ViewController是ImageDownloader的委托，当图像下载完成后，它会调用-acceptImage，然后在主线程上执行选择器以执行表更新。另请参阅UITableView Reference

- (void)setDownloadedImage:(NSMutableDictionary *)d {
    UIImageView *imgV = (UIImageView *)[d objectForKey:@"imageView"];
    NSIndexPath *indexPath = [d objectForKey:@"userInfo"];
    [thumbs addObject:[ImageWorks imageWithImage:[UIImage imageWithData:[d objectForKey:@"image"]] scaledToSize:imgV.frame.size]];
    [table beginUpdates];
    [table insertRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationMiddle];
    [table endUpdates];
    loadingView.hidden = YES;
}

- (void)acceptImage:(NSData *)image ForUserInfo:(id)userInfo ForUrl:(NSString *)url {
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    NSMutableDictionary *d = [[NSMutableDictionary alloc] init];
    iPhoneMyTableCell *cell = [[[NSBundle mainBundle] loadNibNamed:@"iPhoneMyTableCell" owner:self options:nil] lastObject];
    [d setObject:userInfo forKey:@"userInfo"];
    [d setObject:(image ? image : UIImagePNGRepresentation([UIImage imageNamed:@"ImageMissing.png"])) forKey:@"image"];
    [d setObject:cell.myImageView forKey:@"imageView"];
    [self performSelectorOnMainThread:@selector(setDownloadedImage:) withObject:d waitUntilDone:YES];
    [d release];
    [pool drain];
}

Answer 2

您是否致电[tableView reloadData];？

TableView重载问题

2 个答案: