title: Capturing signatures in an iOS app
body: <p>We have a need to capture signatures from an iOS app – the use case is letting the user draw their signature with their finger directly onto the screen. I’m more of a web guy so my default approach would be to embed a web view and use canvas to let the user draw, then capturing a PNG with <code>toDataURL</code>. A native Cocoa control would probably be nicer though. Are there any pre-built solutions out there, or an easy API to use? I note that the kanji input on iOS lets you draw characters on your phone: is this API available for use or is it private?</p>