Resizing UITableView ImageView - ios

Question

How do I resize the UIImageView in a UITableViewCell? I'm passing in a large image (at least 100x100px), so the image itself shouldn't be the problem (it should scale down with the imageview)
cell.imageView.image = [UIImage imageNamed:#"unread.png"];
CGSize itemSize = CGSizeMake(25, 25);
UIGraphicsBeginImageContext(itemSize);
CGRect imageRect = CGRectMake(0.0, 0.0, itemSize.width, itemSize.height);
[cell.imageView.image drawInRect:imageRect];
cell.imageView.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
Normally the UIImageView in the UITableViewCell is 43 points (or 86 pixels) in height and width. I'd like to size it down to 20 x 20 but this isn't doing anything. Am I missing something?

Answer 1

You can't change the frame of uiimageview of uitableviewcell. You can choose an option from the below
Create a custom cell and place a uiimageview at your requirement(which is the best solution and i prefer this one).
Use core graphics inside your cellForRowAtIndexPath:
CGSize itemSize = CGSizeMake(width, height);
UIGraphicsBeginImageContext(itemSize);
CGRect imageRect = CGRectMake(0.0, 0.0, itemSize.width, itemSize.height);
[cell.imageView.image drawInRect:imageRect];
cell.imageView.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

Answer 2

I hope following function useful for you:
+(UIImage*)resizeImage:(UIImage *)image width:(int)width height:(int)height {
CGFloat targetWidth = width;
CGFloat targetHeight = height;
CGImageRef imageRef = [image CGImage];
CGBitmapInfo bitmapInfo = CGImageGetBitmapInfo(imageRef);
CGColorSpaceRef colorSpaceInfo = CGImageGetColorSpace(imageRef);
if (bitmapInfo == kCGImageAlphaNone) {
bitmapInfo = kCGImageAlphaNoneSkipLast;
}
CGContextRef bitmap;
if (image.imageOrientation == UIImageOrientationUp || image.imageOrientation == UIImageOrientationDown) {
bitmap = CGBitmapContextCreate(NULL, targetWidth, targetHeight, CGImageGetBitsPerComponent(imageRef), CGImageGetBytesPerRow(imageRef), colorSpaceInfo, bitmapInfo);
} else {
bitmap = CGBitmapContextCreate(NULL, targetHeight, targetWidth, CGImageGetBitsPerComponent(imageRef), CGImageGetBytesPerRow(imageRef), colorSpaceInfo, bitmapInfo);
}
// In the right or left cases, we need to switch scaledWidth and scaledHeight,
// and also the thumbnail point
if (image.imageOrientation == UIImageOrientationLeft) {
CGContextRotateCTM (bitmap, radians(90));
CGContextTranslateCTM (bitmap, 0, -targetHeight);
} else if (image.imageOrientation == UIImageOrientationRight) {
CGContextRotateCTM (bitmap, radians(-90));
CGContextTranslateCTM (bitmap, -targetWidth, 0);
} else if (image.imageOrientation == UIImageOrientationUp) {
// NOTHING
} else if (image.imageOrientation == UIImageOrientationDown) {
CGContextTranslateCTM (bitmap, targetWidth, targetHeight);
CGContextRotateCTM (bitmap, radians(-180.));
}
CGContextDrawImage(bitmap, CGRectMake(0, 0, targetWidth, targetHeight), imageRef);
CGImageRef ref = CGBitmapContextCreateImage(bitmap);
UIImage* newImage = [UIImage imageWithCGImage:ref];
CGContextRelease(bitmap);
CGImageRelease(ref);
return newImage;
}