在UIImage视图中的图像上绘制折线

Question

I want to draw polylines over and image loaded in an UIImageView.

Can someone give me some tips on where to start?

Thank you

Answer 1

To draw polygon you should use the drawRect method located in UIView subclass.

So 2 solutions :
1°) You subclass UIImageView and in drawRect you draw your image and draw your polylines then
2°) You have an UIImageView and on the top an UIView subclass where you draw your polylines

Drawing the polylines won't be a problem (you should find an answer on stack). (like here : polyines on iphone )