How to Use ios4 Retina screen to display images

IPhone 4 supports retina screens, that is, pixels are invisible to the naked eye. In the development process, how do we load Retina display images?

2x.The method is: we need to prepare two images, one of which is normal and the other is retina. For example, normalis icon.png, and retinais icon@2x.png.

Add the two images to the project at the same time.CodeAs follows:

Imageview. Image = [uiimage imagenamed: @ "icon.png"];

This wayProgramDuring the runtime, icon@2x.pngwith AA will be created. If yes, icon.png will be created. If no, icon.png will be created.

In addition, if you have many retina programs running on the background when the memory is insufficient, it will load normal programs to save memory.