How do I make UITableViewCell's ImageView a fi

Question

I have a bunch of images I am using for cell's image views, they are all no bigger than 50x50. e.g. 40x50, 50x32, 20x37 .....

When I load the table view, the text doesn't line up because the width of the images varies. Also I would like small images to appear in the centre as opposed to on the left.

Here is the code I am trying inside my 'cellForRowAtIndexPath' method

cell.imageView.autoresizingMask = ( UIViewAutoresizingNone );
cell.imageView.autoresizesSubviews = NO;
cell.imageView.contentMode = UIViewContentModeCenter;
cell.imageView.bounds = CGRectMake(0, 0, 50, 50);
cell.imageView.frame = CGRectMake(0, 0, 50, 50);
cell.imageView.image = [UIImage imageWithData: imageData];

As you can see I have tried a few things, but none of them work.

Answer 1

For those of you who don't have a subclass of UITableViewCell:

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

      CGSize itemSize = CGSizeMake(40, 40);
      UIGraphicsBeginImageContextWithOptions(itemSize, NO, UIScreen.mainScreen.scale);
      CGRect imageRect = CGRectMake(0.0, 0.0, itemSize.width, itemSize.height);
      [cell.imageView.image drawInRect:imageRect];
      cell.imageView.image = UIGraphicsGetImageFromCurrentImageContext();
      UIGraphicsEndImageContext();

 [...]
     return cell;
}

The code above sets the size to be 40x40.

Swift 2

    let itemSize = CGSizeMake(25, 25);
    UIGraphicsBeginImageContextWithOptions(itemSize, false, UIScreen.mainScreen().scale);
    let imageRect = CGRectMake(0.0, 0.0, itemSize.width, itemSize.height);
    cell.imageView?.image!.drawInRect(imageRect)
    cell.imageView?.image! = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

Or you can use another(not tested) approach suggested by @Tommy:

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

      CGSize itemSize = CGSizeMake(40, 40);
      UIGraphicsBeginImageContextWithOptions(itemSize, NO, 0.0)          
 [...]
     return cell;
}

Swift 3+

let itemSize = CGSize.init(width: 25, height: 25)
UIGraphicsBeginImageContextWithOptions(itemSize, false, UIScreen.main.scale);
let imageRect = CGRect.init(origin: CGPoint.zero, size: itemSize)
cell?.imageView?.image!.draw(in: imageRect)
cell?.imageView?.image! = UIGraphicsGetImageFromCurrentImageContext()!;
UIGraphicsEndImageContext();

The code above is the Swift 3+ version of the above.

Answer 2

UIImage *image = cell.imageView.image;

UIGraphicsBeginImageContext(CGSizeMake(35,35));
// draw scaled image into thumbnail context

[image drawInRect:CGRectMake(5, 5, 35, 35)]; //
UIImage *newThumbnail = UIGraphicsGetImageFromCurrentImageContext();
// pop the context
UIGraphicsEndImageContext();
if(newThumbnail == nil)
{
    NSLog(@"could not scale image");
    cell.imageView.image = image;
}
else
{
    cell.imageView.image = newThumbnail;
}

Answer 3

Here is @germanattanasio 's working method, written for Swift 3

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    ...
    cell.imageView?.image = myImage
    let itemSize = CGSize(width:42.0, height:42.0)
    UIGraphicsBeginImageContextWithOptions(itemSize, false, 0.0)
    let imageRect = CGRect(x:0.0, y:0.0, width:itemSize.width, height:itemSize.height)
    cell.imageView?.image!.draw(in:imageRect)
    cell.imageView?.image! = UIGraphicsGetImageFromCurrentImageContext()!
        UIGraphicsEndImageContext()
}

Answer 4

I've created an extension using @GermanAttanasio 's answer. It provides a method to resize an image to a desired size, and another method to do the same while adding a transparent margin to the image (this can be useful for table views where you want the image to have a margin as well).

import UIKit

extension UIImage {

    /// Resizes an image to the specified size.
    ///
    /// - Parameters:
    ///     - size: the size we desire to resize the image to.
    ///
    /// - Returns: the resized image.
    ///
    func imageWithSize(size: CGSize) -> UIImage {

        UIGraphicsBeginImageContextWithOptions(size, false, UIScreen.mainScreen().scale);
        let rect = CGRectMake(0.0, 0.0, size.width, size.height);
        drawInRect(rect)

        let resultingImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();

        return resultingImage
    }

    /// Resizes an image to the specified size and adds an extra transparent margin at all sides of
    /// the image.
    ///
    /// - Parameters:
    ///     - size: the size we desire to resize the image to.
    ///     - extraMargin: the extra transparent margin to add to all sides of the image.
    ///
    /// - Returns: the resized image.  The extra margin is added to the input image size.  So that
    ///         the final image's size will be equal to:
    ///         `CGSize(width: size.width + extraMargin * 2, height: size.height + extraMargin * 2)`
    ///
    func imageWithSize(size: CGSize, extraMargin: CGFloat) -> UIImage {

        let imageSize = CGSize(width: size.width + extraMargin * 2, height: size.height + extraMargin * 2)

        UIGraphicsBeginImageContextWithOptions(imageSize, false, UIScreen.mainScreen().scale);
        let drawingRect = CGRect(x: extraMargin, y: extraMargin, width: size.width, height: size.height)
        drawInRect(drawingRect)

        let resultingImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();

        return resultingImage
    }
}

Answer 5

A Simply Swift,

Step 1: Create One SubClass of UITableViewCell
Step 2: Add this method to SubClass of UITableViewCell

override func layoutSubviews() {
    super.layoutSubviews()
    self.imageView?.frame = CGRectMake(0, 0, 10, 10)
}

Step 3: Create cell object using that SubClass in cellForRowAtIndexPath,

Ex: let customCell:CustomCell = CustomCell(style: UITableViewCellStyle.Default, reuseIdentifier: "Cell")

Step 4: Enjoy

Answer 6

Here's how i did it. This technique takes care of moving the text and detail text labels appropriately to the left:

@interface SizableImageCell : UITableViewCell {}
@end
@implementation SizableImageCell
- (void)layoutSubviews {
    [super layoutSubviews];

    float desiredWidth = 80;
    float w=self.imageView.frame.size.width;
    if (w>desiredWidth) {
        float widthSub = w - desiredWidth;
        self.imageView.frame = CGRectMake(self.imageView.frame.origin.x,self.imageView.frame.origin.y,desiredWidth,self.imageView.frame.size.height);
        self.textLabel.frame = CGRectMake(self.textLabel.frame.origin.x-widthSub,self.textLabel.frame.origin.y,self.textLabel.frame.size.width+widthSub,self.textLabel.frame.size.height);
        self.detailTextLabel.frame = CGRectMake(self.detailTextLabel.frame.origin.x-widthSub,self.detailTextLabel.frame.origin.y,self.detailTextLabel.frame.size.width+widthSub,self.detailTextLabel.frame.size.height);
        self.imageView.contentMode = UIViewContentModeScaleAspectFit;
    }
}
@end

...

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[SizableImageCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    }

    cell.textLabel.text = ...
    cell.detailTextLabel.text = ...
    cell.imageView.image = ...
    return cell;
}