CODEWITHSUNDEEP
iosuiimagescreen-resolution
Xernox
Xernox

Reputation: 1736

How to choose 1 UIImage size for all iPhone resolutions?

What image size should I choose if I can (at the moment) add only one image size? Images will be used in UITableViewCell, most likely width will be from edge to edge, while height may vary.

So should I add 1242px width images and then app itself would downscale it to 750/640px? Or should I use 750px, because there are more iPhone 6 users than 6+ and more users will have better looking image (in other words more people will see original image, rather than scaled)?

Upvotes: 1

Views: 78

Answers (1)

Tapani
Tapani

Reputation: 3231

Use 1242px image and downscale it. To get the best possible image quality set yourUIImageView.layer.minificationFilter = kCAFilterTrilinear. You wont see any difference in the image quality when using trilinear filtering.

Another options is to downscale the image before using it:

extension UIImage {
  public func rescale(width: CGFloat, _ height: CGFloat) -> UIImage {
    let newSize = CGSizeMake(width, height)

    UIGraphicsBeginImageContextWithOptions(newSize, false, 0.0)
    drawInRect(CGRectMake(0.0, 0.0, newSize.width, newSize.height))
    let scaledImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()

    return scaledImage
  }
}

let myImage = UIImage(named: "myimage").rescale(newWidth, newHeight)

Upvotes: 2

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