Electronic Signature Library for Objective-C

An iOS App needs to collect a user signature using an UIImageView on which it is drawn. When drawing this signature on the UIImageView, in turn, both the resulting image and the x, y, z coordinates of each point are made available, as well as the instant of time at which that point was taken, this instant of time for the x,y,z coordinate is called t. Collection of points x, y, z(user pressure on touch screen) and t have exactly the same number of elements, and are made available through this Objective-C Library. Some important remarks are: 1) This library will be fully coded in Objective-C 2) Image for the traced signature must be obtainable through a suitable method (PNG of JPG) 3) A collection of coordinates for signature has to be gathered and obtainable(using a suitable method): X (X axis), Y (Y axis), T (time when this coordinate was obtained) and Z (user pressure on touch screen) 4) Multilanguage support for labels and/or error messages (English & Spanish) 5) A fully functional example will be developed and delivered together with this library (source code in Objective-C for both) 6) Source code has to be documented 7) A developer guide has to be delivered (Word or Pdf Document) 8) An actual version of this library coded in Swift is available for conversion (if prefered)