As there is no checkbox control in iOS, it always become a bit of an issue on how to mimic that functionality in an app or in a mobile site. The Apple HIG is strangely silent on the issue, other than offering up a segmented control that will only accept a single choice. That's fine for a radio group, but doesn't work for something where you want someone to check a box before continuing, like accepting terms and conditions.
One might consider using the on/off slider control, but that's not really its intended use. I know there are ways to use an image and set an on/off state - just have a big checkbox that fits thumb/finger interaction.
Just wondering what people thought about this, and what solutions they have used.