为您的应用程序试用此演示

try this demo for your application

http://code4app.net/ios/Paint-Pad/4fcf74876803faec66000000

https://www.cocoacontrols。 com / controls / smooth-line-view

https://www.cocoacontrols.com/controls/acedrawingview

https：/ /www.cocoacontrols.com/controls/mgdrawingslate

它可能对您有帮助。