What should image sizes be at @1x, @2x and @3x in Xcode?

Question

For example, I have a 100*100 size imageview or button, and I want to set its image or backgroundImage with a local .png file. Based o

Answer 1

Yes, your understanding is correct.

A standard resolution image has a scale factor of 1.0 and is referred to as an @1x image. High resolution images have a scale factor of 2.0 or 3.0 and are referred to as @2x and @3x images. Suppose you have a standard resolution @1x image that’s 100px × 100px, for example. The @2x version of this image would be 200px × 200px. The @3x version would be 300px × 300px.

For more details you can check this link https://developer.apple.com/ios/human-interface-guidelines/graphics/image-size-and-resolution/