PDF colors wrong on ipad/iphone HELP!

When exporting PDFs from InDesign they look great on the computere but there is a HUGE color shift on the Ipad/Iphone. The main color is a rich purple which turns into neon blue on the iphone/Ipad.
Through research I have found that iphones/ipads show RGB color. I have tried ALL RGB settings in InDesign and the best that I get is a dark blue.
Has anyone been able to solve this???
HELP!

I agree with Dov that this is an Apple iOS problem—there's no color management. But the problem is exacerbated if the PDF contains CMYK of any flavor—the further removed from device RGB the color is the worse the result.
You can see this if you make a document with a mix of CMYK and RGB and export it to PDF/X-4 where there are no color conversions and everything is profiled, vs. the same document converted and flattened to sRGB on export.
So here's an example showing why John Hawkinson's #3 suggestion is actually the best approach.
An InDesign page with SWOP CMYK and Adobe RGB objects. The Transparency Blend Space is RGB.
And the PDF/X-4 on an iPad where the CMYK objects completely fall apart because their profiles can't be used.
And the sRGB export, which isn't perfect but is considerably better, because sRGB is closer to the iOS device RGB than SWOP CMYK. The conversion to sRGB using an RGB Transparency Blend Space simply produces a better result:
Here are the 2 test PDFs
http://www.zenodesign.com/forum/PDFsRGB.pdf
http://www.zenodesign.com/forum/PDFX4.pdf

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