By default, iOS’s@2X -> @3X ratio is 1.5 times. For example, if your design page size is750x1334, its @3X will be scaled to a width of 1125. But we know that the resolution of iPhone XS Max is 1242×2688.

 

In some cases, if you want @3X to be the size of 1242, there are three ways to set it up, as shown below:

Method 1:

@3x方式1

 

Method 2:

@3x方式3

 

Method 3:

@3x方式33

The size of iOS @3X (New)