ios - How to get the intersection of two CGPath? -

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i using cashapelayer.path , calayer.mask set image mask, can achieve "difference set" , "union" effect cgpath setting 

masklayer.fillrule = kcafillruleevenodd/kcafillrulezero

however, how can intersection of 2 paths? cannot achieve even-odd rule

here example: enter image description here

let view = uiimageview(frame: cgrectmake(0, 0, 400, 400)) view.image = uiimage(named: "scene.jpg") let masklayer = cashapelayer() let maskpath = cgpathcreatemutable()     cgpathaddellipseinrect(maskpath, nil, cgrectoffset(cgrectinset(view.bounds, 50, 50), 50, 0)) cgpathaddellipseinrect(maskpath, nil, cgrectoffset(cgrectinset(view.bounds, 50, 50), -50, 0)) masklayer.path = maskpath masklayer.fillrule = kcafillruleevenodd masklayer.path = maskpath view.layer.mask = masklayer

how can middle part of shown? mean, middle part(which blank in sample view).

i can in vector design software ai, think there must way handle.

extension uiimage {     func doublecirclemask(#circlesize:cgfloat)-> uiimage {         let rectangle = cgrectmake(0, 0, size.width, size.height)         uigraphicsbeginimagecontext(size)         let x = size.width/2-circlesize/2         let y = size.height/2-circlesize/2         let offset = circlesize/4         let shape1 = uibezierpath(roundedrect: cgrectmake(x-offset, y, circlesize, circlesize), cornerradius: circlesize/2)         shape1.appendpath(uibezierpath(roundedrect: cgrectmake(x+offset, y, circlesize, circlesize), cornerradius: circlesize/2))         shape1.addclip()         drawinrect(rectangle)         let result = uigraphicsgetimagefromcurrentimagecontext()         uigraphicsendimagecontext()         return result     }     func doublecircleintersectionmask(#circlesize:cgfloat)-> uiimage {         let rectangle = cgrectmake(0, 0, size.width, size.height)         uigraphicsbeginimagecontext(size)         let x = size.width/2-circlesize/2         let y = size.height/2-circlesize/2         let offset = circlesize/4         let shape1 = uibezierpath(roundedrect: cgrectmake(x-offset, y, circlesize, circlesize), cornerradius: circlesize/2)         let shape2 = uibezierpath(roundedrect: cgrectmake(x+offset, y, circlesize, circlesize), cornerradius: circlesize/2)         shape1.addclip()         shape2.addclip()         drawinrect(rectangle)         let result = uigraphicsgetimagefromcurrentimagecontext()         uigraphicsendimagecontext()         return result     }  }

testing

let mypicture = uiimage(data: nsdata(contentsofurl: nsurl(string: "http://i.stack.imgur.com/xs4rx.jpg")!)!)!  let mypictureunion = mypicture.doublecirclemask(circlesize: 300)  let mypictureintersection = mypicture.doublecircleintersectionmask(circlesize: 300)

enter image description here


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