Techniques are described in blog entry: Capture a Signature on iOS
Connect the PPSSignatureView to the view property of a GLKViewController (or subclass).
PPSSignatureView is available through CocoaPods, to install it simply add the following line to your Podfile:
pod "PPSSignatureView"
Jason Harwig ( jason@pinepointsoftware.com ) Pine Point Software LLC
PPSSignatureView is available under the MIT license. See the LICENSE file for more info.