TableView 中图像的大小不正确

发布于 2024-11-10 05:35:31 字数 1325 浏览 2 评论 0原文

我正在使用来自 URL 的图像创建一个表视图，但图像不会调整到所有视图的大小，直到我将其按入行中。知道为什么会这样吗？这是一个自定义表格视图

我的代码是：

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

    static NSString *CellIdentifier = @"Celula_Noticias";

   Celula_Noticias *cell = (Celula_Noticias*)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {

    NSArray * top= [[NSBundle mainBundle] loadNibNamed:@"Celula_Noticias" owner:self options:nil];

    for(id currentObject in top){
        if ([currentObject isKindOfClass:[Celula_Noticias class]]) {
            cell= (Celula_Noticias *) currentObject;
            break;
        }

    }


}


cell.Image_Noticias_1.image=[UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[[noticias objectAtIndex:indexPath.row ] objectAtIndex:0]]]];

cell.Image_Noticias_2.image=[UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[[noticias objectAtIndex:indexPath.row ] objectAtIndex:2]]]];

cell.Titulo_Noticias_1.text=[[noticias objectAtIndex:indexPath.row ] objectAtIndex:1];
cell.Titulo_Noticias_2.text=[[noticias objectAtIndex:indexPath.row ] objectAtIndex:3];


return cell;

}

表格已正确填充，但图像不以正确的尺寸开始。

我尝试过使用 CGRectMake 但它仍然不起作用。

谢谢。

原文

I am creating a table view with images from an URL, but the images don´t re-size to all the view until I presset it in the row.
any idea why that is happening?
This is a custom tableview

My code is :

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

    static NSString *CellIdentifier = @"Celula_Noticias";

   Celula_Noticias *cell = (Celula_Noticias*)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {

    NSArray * top= [[NSBundle mainBundle] loadNibNamed:@"Celula_Noticias" owner:self options:nil];

    for(id currentObject in top){
        if ([currentObject isKindOfClass:[Celula_Noticias class]]) {
            cell= (Celula_Noticias *) currentObject;
            break;
        }

    }


}


cell.Image_Noticias_1.image=[UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[[noticias objectAtIndex:indexPath.row ] objectAtIndex:0]]]];

cell.Image_Noticias_2.image=[UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[[noticias objectAtIndex:indexPath.row ] objectAtIndex:2]]]];

cell.Titulo_Noticias_1.text=[[noticias objectAtIndex:indexPath.row ] objectAtIndex:1];
cell.Titulo_Noticias_2.text=[[noticias objectAtIndex:indexPath.row ] objectAtIndex:3];


return cell;

}

the table is correctly fill, but the image dont start with the correct size.

I have tried use the CGRectMake but it still don t work.

Thanks.

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堇色安年 2024-11-17 05:35:31

创建一个函数来对下载的图像进行后处理：

- (UIImage*)postProcessImage:(UIImage*)image
{
        CGSize itemSize = CGSizeMake(50, 50);

        UIGraphicsBeginImageContext(itemSize);
        CGRect imageRect = CGRectMake(0.0, 0.0, itemSize.width, itemSize.height);
        [image drawInRect:imageRect];
        UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
        return newImage;
}

上面的函数将为您返回一个 50*50 的漂亮图像。

然后你可以这样做：

UIImage* downloadedImage = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"...url goes here..."]]];
UIImage* newImage = [self posProcessImage:downloadedImage];
cell.imageView.image=newImage

Create a function to post process the downloaded image:

- (UIImage*)postProcessImage:(UIImage*)image
{
        CGSize itemSize = CGSizeMake(50, 50);

        UIGraphicsBeginImageContext(itemSize);
        CGRect imageRect = CGRectMake(0.0, 0.0, itemSize.width, itemSize.height);
        [image drawInRect:imageRect];
        UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
        return newImage;
}

The function above will give you back a nice image of 50*50.

Then you could do:

UIImage* downloadedImage = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"...url goes here..."]]];
UIImage* newImage = [self posProcessImage:downloadedImage];
cell.imageView.image=newImage

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