drawing - Masking circle segments in swift -


i'm creating simple player app. there circle, shows progress of playing song. enter image description here

what best way draw circle in swift , make mask? assume can draw 2 circles putting width stroke thickness want , without filling it. , white 1 has masked according parameter. don't have idea, how mask in proper way.

i came solution recently:

class circularprogressview: uiview {      private let floatpi = cgfloat(m_pi)     private var progresscolor = uicolor.greencolor()     private var progressbackgroundcolor = uicolor.graycolor()      @ibinspectable var percent: cgfloat = 0.11 {         didset {             setneedsdisplay()         }     }     @ibinspectable var linewidth: cgfloat = 18      override func drawrect(rect: cgrect) {         let context = uigraphicsgetcurrentcontext()         let origo = cgpointmake(frame.size.width / 2, frame.size.height / 2)         let radius: cgfloat = frame.size.height / 2 - linewidth / 2         cgcontextsetlinewidth(context, linewidth)         cgcontextmovetopoint(context, frame.width / 2, linewidth / 2)         cgcontextaddarc(context, origo.x, origo.y, radius, floatpi * 3 / 2, floatpi * 3 / 2 + floatpi * 2 * percent, 0)         progresscolor.setstroke()         let lastpoint = cgcontextgetpathcurrentpoint(context)          cgcontextstrokepath(context)          cgcontextmovetopoint(context, lastpoint.x, lastpoint.y)         cgcontextaddarc(context, origo.x, origo.y, radius, floatpi * 3 / 2 + floatpi * 2 * percent, floatpi * 3 / 2, 0)         progressbackgroundcolor.setstroke()         cgcontextstrokepath(context)     } }

you have set correct frame (via code or interface builder), , set percent property.

this solution not using mask or 2 circles, 2 arcs, first start @ 12 o clock , goes 2 * pi * progress percent, , other arc drawn end of previous arc 12 o clock.

important: percent property has between 0 , 1!


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