Watchkit Interface Controller 38mm and 42mm background image size

Question

For some reason, I have searched high and low, and cannot find the exact image sizes that I need to supply for a background image for both the 38mm and 42mm sizes in Watchkit. Currently I am stretching a smaller image using "scale to fill".

I don't want it stretched, so I am looking for real pixel sizes.

Answer 1

Here is the code I use to get the size for the background image in my WKInterfaceController. My app has a page control, you you probably don't want the extra -14 at the end.

-(CGSize)backgroundSize
{
    CGRect contentFrame = self.contentFrame;
    CGSize size = contentFrame.size;
    CGFloat contentScale = 2.0;
    size.width *= contentScale;
    size.height *= contentScale;

    //I lined up the generated image with one in the simulator until
    //they perfectly matched.  I did this on both 38 and 42 mm.
    //I am not sure why they all came out to be off 4.

    //There is an offset of 10 in IB and I am not sure I need this
    //to be 4 to match perfect.
    size.height -= 4;

    //it looks like there is 2 pixels around the edge
    size.width -= 4;

    //Using page mode we need to take off an additional 14 pixels for the page dots at the bottom
    size.height -= 14;

    return size;
}