ios - how to create the pie Chart and fill percentage in swift -

i have create uiview uiviewcontroller, how create pie chart in uiview?, have create pieview class uiview , class code below,

import uikit import foundation  class pieview: uiview {      public var datapoints: [datapoint]? {          // use whatever type makes sense app, though i'd suggest array (which ordered) rather dictionary (which isn't)         didset { setneedsdisplay() }     }      @ibinspectable internal var linewidth: cgfloat = 2 {         didset { setneedsdisplay() }     }  }  

i have confused format used? coreplot or charts frameworks or other method.

objective-c custom code need swift language code, how implement pie chart in uiview , fill percentage,

thanks in advance.

i think code snippet taken https://stackoverflow.com/a/33947052/1271826 imagined simple pieview class defined like:

import uikit  public class datapoint {     let text: string     let value: float     let color: uicolor      public init(text: string, value: float, color: uicolor) {         self.text = text         self.value = value         self.color = color     } }  @ibdesignable public class pieview: uiview {      public var datapoints: [datapoint]? {          // use whatever type makes sense app, though i'd suggest array (which ordered) rather dictionary (which isn't)         didset { setneedsdisplay() }     }      @ibinspectable public var linewidth: cgfloat = 2 {         didset { setneedsdisplay() }     }      override public func prepareforinterfacebuilder() {         super.prepareforinterfacebuilder()         datapoints = [             datapoint(text: "foo", value: 3, color: uicolor.redcolor()),             datapoint(text: "bar", value: 4, color: uicolor.yellowcolor()),             datapoint(text: "baz", value: 5, color: uicolor.bluecolor())         ]     }      public override func drawrect(rect: cgrect) {         guard datapoints != nil else {             return         }          let center = cgpoint(x: bounds.size.width / 2.0, y: bounds.size.height / 2.0)         let radius = min(bounds.size.width, bounds.size.height) / 2.0 - linewidth         let total = datapoints?.reduce(float(0)) { $0 + $1.value }         var startangle = cgfloat(-m_pi_2)          uicolor.blackcolor().setstroke()          datapoint in datapoints! {             let endangle = startangle + cgfloat(2.0 * m_pi) * cgfloat(datapoint.value / total!)              let path = uibezierpath()             path.movetopoint(center)             path.addarcwithcenter(center, radius: radius, startangle: startangle, endangle: endangle, clockwise: true)             path.closepath()             path.linewidth = linewidth             datapoint.color.setfill()              path.fill()             path.stroke()              startangle = endangle         }     }      public override func layoutsubviews() {         super.layoutsubviews()         setneedsdisplay()     } } 

and, if added uiview in ib , changed base class pieview , add @iboutlet, like:

class viewcontroller: uiviewcontroller {      @iboutlet weak var pieview: pieview!      override func viewdidload() {         super.viewdidload()          pieview.datapoints = [             datapoint(text: "foo", value: 3, color: uicolor.redcolor()),             datapoint(text: "bar", value: 4, color: uicolor.yellowcolor()),             datapoint(text: "baz", value: 5, color: uicolor.bluecolor())         ]     }  } 

that yields:

note, that's @ibdesignable (and implements prepareforinterfacebuilder) when add storyboard, you'll see sample pie chart.

clearly, absurdly simplistic implementation, can expand upon see fit.