Question

我有一个tableview，每个单元格都有图像，标题和副标题。每个单元格都有不同的图像，我无法弄清楚如何使它们的右侧相互对齐。换句话说，有些比其他更广泛，并且更进一步向着单元格的右侧，也推动了标题和副标题。我不在乎左右两边是黑条，还是顶部和底部，我只是希望它们都占用相同的空间。我试过这是我的viewforrowatindexpath方法：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [[UITableViewCell alloc]
                             initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"cell"];
    cell.textLabel.text = [[mainDelegate.mapAnnotations objectAtIndex:indexPath.row] title];
    cell.detailTextLabel.text = (NSString *)[[mainDelegate.mapAnnotations objectAtIndex:indexPath.row] location];
    NSData *imageData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:[[mainDelegate.mapAnnotations objectAtIndex:indexPath.row] imageURL]]];
    UIImage *theImage = [[UIImage alloc] initWithData:imageData];

    cell.imageView.frame = CGRectMake(0, 0, 20, 20);
    cell.imageView.image = theImage;
    cell.imageView.backgroundColor = [UIColor colorWithWhite:0.0 alpha:1.0];
    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

    // return it
    return cell;
    [imageData release];
    [theImage release]; 
}

我认为通过设置单元格imageview的框架，图像会适合它，但是当我运行应用程序时添加该行不会改变？有没有办法在viewforrowatindexpath方法中完成这个？

Answer 1

我知道您无法控制图像尺寸。

我没试过，但你可以尝试一下：

cell.imageView.clipsToBounds;

如果这个简单的步骤不起作用，无论如何 您可以尝试在将图像大小添加到cell.imageview之前设置图像大小。

<强>第一将此功能添加到您的文件

- (UIImage *)resetImage:(UIImage*)originalImage {

    CGSize newSize = CGSizeMake(20, 20)
    CGRect imageRect = CGRectMake(0,0, newSize.width,newSize.height);

    UIGraphicsBeginImageContext(newSize);
    [originalImage drawInRect:SymbolRectangle];
    UIImage *theImage=UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();


    return theImage;
}

秒设置单元格图像

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [[UITableViewCell alloc]
                             initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"cell"];
    cell.textLabel.text = [[mainDelegate.mapAnnotations objectAtIndex:indexPath.row] title];
    cell.detailTextLabel.text = (NSString *)[[mainDelegate.mapAnnotations objectAtIndex:indexPath.row] location];
    NSData *imageData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:[[mainDelegate.mapAnnotations objectAtIndex:indexPath.row] imageURL]]];
    UIImage *theImage = [[UIImage alloc] initWithData:imageData];


    cell.imageView.image = [self resetImage:theImage];
    cell.imageView.backgroundColor = [UIColor colorWithWhite:0.0 alpha:1.0];
    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

    // return it
    return cell;
    [imageData release];
    [theImage release]; 
}

现在我不得不承认我不在xcode附近检查它，但我相信这是解决方案的方向。

祝你好运

Answer 2

O.K - 我认为这就是你要找的东西。

- (UIImage *)imageByScalingProportionallyToSize:(CGSize)targetSize {

UIImage *sourceImage = self;
UIImage *newImage = nil;

CGSize imageSize = sourceImage.size;
CGFloat width = imageSize.width;
CGFloat height = imageSize.height;

CGFloat targetWidth = targetSize.width;
CGFloat targetHeight = targetSize.height;

CGFloat scaleFactor = 0.0;
CGFloat scaledWidth = targetWidth;
CGFloat scaledHeight = targetHeight;

CGPoint thumbnailPoint = CGPointMake(0.0,0.0);

if (CGSizeEqualToSize(imageSize, targetSize) == NO) {

        CGFloat widthFactor = targetWidth / width;
        CGFloat heightFactor = targetHeight / height;

        if (widthFactor < heightFactor) 
                scaleFactor = widthFactor;
        else
                scaleFactor = heightFactor;

        scaledWidth  = width * scaleFactor;
        scaledHeight = height * scaleFactor;

        // center the image

        if (widthFactor < heightFactor) {
                thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5; 
        } else if (widthFactor > heightFactor) {
                thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5;
        }
}


// this is actually the interesting part:

UIGraphicsBeginImageContext(targetSize);

CGRect thumbnailRect = CGRectZero;
thumbnailRect.origin = thumbnailPoint;
thumbnailRect.size.width  = scaledWidth;
thumbnailRect.size.height = scaledHeight;

[sourceImage drawInRect:thumbnailRect];

newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

if(newImage == nil) NSLog(@"could not scale image");


return newImage ;
}

我在这里找到了 - how to scale a uiimageview proportionally

在cellForRowAtIndexPath方法中调整tableview的单元格图像的大小

2 个答案: