Objective c 在表视图单元格内的UIImageView中设置图像

我使用

NSThread

下载了一些图像。下载完所有图像后，我必须将它们放在

cell.myimageview

中。请给出在用户定义的方法中设置图像的解决方案

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


    static NSString *CellIdentifier = @"Cell";
    TableCell *cell = (TableCell *)[TableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {

        cell = [[[TableCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];

    }


    NSString *bedsbaths=[NSString stringWithFormat:@"Beds:%@ Baths:%@",[[AppDeleget.statuses valueForKey:@"beds"] objectAtIndex:indexPath.row],[[AppDeleget.statuses valueForKey:@"baths"] objectAtIndex:indexPath.row]];
    cell.mlsno.text=[[AppDeleget.statuses valueForKey:@"mlsno"] objectAtIndex:indexPath.row];
    cell.price.text=[[AppDeleget.statuses valueForKey:@"price"] objectAtIndex:indexPath.row];
    cell.address.text=[[AppDeleget.statuses valueForKey:@"address"] objectAtIndex:indexPath.row];
    cell.bedsbaths.text=bedsbaths;
    cell.accessoryType=UITableViewCellAccessoryDetailDisclosureButton;
return cell;

}
-(void)LoadImage
{
    for(int x=0;x<[ListPhotos count];x++)
    {   
        NSData *imageData =[ListPhotos objectAtIndex:x]; 
        id path = imageData;
        NSURL *url = [NSURL URLWithString:path];
        NSLog(@"%@",url);
        NSData *data = [NSData dataWithContentsOfURL:url];
        UIImage *img = [[UIImage alloc] initWithData:data];
        [self performSelectorOnMainThread:@selector(downloadDone:) withObject:img waitUntilDone:NO];
    }

}
-(void)downloadDone:(UIImage*)img {

    // I have to set the cell here. How?        
    cell.myimageView.image=img
}

-（UITableViewCell*）tableView:（UITableView*）tableView cellForRowAtIndexPath:（NSIndexPath*）indexPath{
静态NSString*CellIdentifier=@“Cell”；
TableCell*cell=（TableCell*）[TableView dequeueReusableCellWithIdentifier:CellIdentifier]；
如果（单元格==nil）{
cell=[[TableCell alloc]initWithFrame:CGRectZero重用标识符：CellIdentifier]autorelease]；
}
NSString*bedsbaths=[NSString stringWithFormat:@“Beds:%@Baths:%@”，[[AppDeleget.statuses valueForKey:@“Beds”]对象索引：indexath.row]，[AppDeleget.statuses valueForKey:@“Baths”]对象索引：indexath.row]；
cell.mlsno.text=[[AppDeleget.statuses valueForKey:@“mlsno”]objectAtIndex:indexath.row]；
cell.price.text=[[AppDeleget.statuses valueForKey:@“price”]objectAtIndex:indexath.row]；
cell.address.text=[[AppDeleget.statuses valueForKey:@“address”]objectAtIndex:indexPath.row]；
cell.bedsbaths.text=bedsbaths；
cell.accessoryType=UITableViewCellAccessoryDetailDisclosureButton；
返回单元；
}
-（void）加载映像
{
对于（int x=0；x，只要您保留对单元格的引用，这并不太难。我会这样做：

- (void)downloadDone:(UIImage*)img {
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:yourCellRow inSection:yourCellSection];
    UITableViewCell *cell = [myTableView cellForRowAtIndexPath:indexPath];
    // now you have the cell you wish to modify;
    cell.myimageView.image=img;
    [myTableView reloadData];
    // if you would prefer, you could also call [myTableView reloadRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationNone]
    // if you only want to reload that specific cell;
}

即使您能够在
downloadDone:
方法中设置它，您以后也会遇到问题，因为单元格是可重用的。因此设置图像的正确位置应该是
tableView:CellForRowatineXpath:
本身。那么如何加载图像？将它们保存在数组或字典中。假设计数不变，我们可以使用
NSMutableArray
对象存储
NSNull
单例对象及更高版本的计数编号

在
tableView:cellforrowatinexpath:

if ( [[images objectAtIndex:indexPath.row] isMemberOfClass:[UIImage class]] ) {
    cell.myImageView.image = [images objectAtIndex:indexPath.row];
}

在
LoadImage

for(int x=0;x<[ListPhotos count];x++)
{   
    ... 
    [photos replaceObjectAtIndex:x withObject:image];
    [self performSelectorOnMainThread:@selector(downloadDone:) 
                           withObject:[NSNumber numberWithInt:x];
                        waitUntilDone:NO];
}

您可以在cellForRowAtIndexPath方法本身中将图像设置为图像视图。请尝试以下代码：

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


    static NSString *CellIdentifier = @"Cell";
    TableCell *cell = (TableCell *)[TableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {

        cell = [[[TableCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];

    }


    NSString *bedsbaths=[NSString stringWithFormat:@"Beds:%@ Baths:%@",[[AppDeleget.statuses valueForKey:@"beds"] objectAtIndex:indexPath.row],[[AppDeleget.statuses valueForKey:@"baths"] objectAtIndex:indexPath.row]];
    cell.mlsno.text=[[AppDeleget.statuses valueForKey:@"mlsno"] objectAtIndex:indexPath.row];
    cell.price.text=[[AppDeleget.statuses valueForKey:@"price"] objectAtIndex:indexPath.row];
    cell.address.text=[[AppDeleget.statuses valueForKey:@"address"] objectAtIndex:indexPath.row];
    cell.bedsbaths.text=bedsbaths;
    NSString *filePath = [self getImagePath];
    UIImage * img = [UIImage imageWithContentsOfFile:filePath];
    cell.myimageView.image=img;
    cell.accessoryType=UITableViewCellAccessoryDetailDisclosureButton;
    return cell;

}
    -(NSString *)getImagePath
    {
      /*here you can get the path of your image here*/

    }

在你的牢房里

UIImageView *logoImgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 70, 55)];
logoImgView.backgroundColor = [UIColor clearColor];
 [cell.Imageview addSubview:logoImgView];
 NSMutableArray *arrChng = [[NSMutableArray alloc] init];
 [arrChng addObject:logoImgView];
 [arrChng addObject:[Array objectAtIndex:indexPath.row];
 [self performSelectorInBackground:@selector(setImagesAfterShow:) withObject:arrChng];


-(void)setImagesAfterShow:(NSMutableArray *)array
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
NSURL *url = [NSURL URLWithString:[array objectAtIndex:1]];
NSData *data = [[NSData alloc] initWithContentsOfURL:url];
UIImageView *img = [array objectAtIndex:0];
img.image = [UIImage imageWithData:data];
[pool release];
}

此方法用于在后端加载图像，因此很容易平滑滚动表

还有一种使用ASIHTTPRequest的方法，其中图像在后端加载，使用该方法非常好。请检查。它可能对您有用。
在包含的视图控制器中

在tableView:cellForRowAtIndexPath方法下：创建新单元格时，输入代码：

cell.imageView.image=[UIImage imageNamed@“name of image.png”]；
我刚刚测试了这个，效果很好。我使用了
cell.imageView.image=[UIImage imageNamed:@“testImage.png”]；
，但想法是一样的。在
下载完成时尝试设置一个日志语句，类似于
NSLog(@“图像是%@”，img）；
以确保图像存在。我猜图像要么不存在，要么在您可以设置它之前被释放（我们可以在找出问题后修复）
UIImageView *logoImgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 70, 55)];
logoImgView.backgroundColor = [UIColor clearColor];
 [cell.Imageview addSubview:logoImgView];
 NSMutableArray *arrChng = [[NSMutableArray alloc] init];
 [arrChng addObject:logoImgView];
 [arrChng addObject:[Array objectAtIndex:indexPath.row];
 [self performSelectorInBackground:@selector(setImagesAfterShow:) withObject:arrChng];


-(void)setImagesAfterShow:(NSMutableArray *)array
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
NSURL *url = [NSURL URLWithString:[array objectAtIndex:1]];
NSData *data = [[NSData alloc] initWithContentsOfURL:url];
UIImageView *img = [array objectAtIndex:0];
img.image = [UIImage imageWithData:data];
[pool release];
}