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參考資料：

https://developer.apple.com/library/ios/documentat...

https://www.cocoanetics.com/2010/07/drawing-on-uii...

http://www.raywenderlich.com/18840/how-to-make-a-s...

http://stackoverflow.com/questions/16994684/why-wh...

http://www.raywenderlich.com/87899/make-simple-drawing-app-uikit-swift

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