Avoid var parameters - which will be deprecated with Swift 3.0

Added colorLerpMode

KDCircularProgress.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name = 'KDCircularProgress'
-  s.version = '1.3.1'
+  s.version = '1.3.4'
   s.license = 'MIT'
   s.summary = 'A circular progress view with gradients written in Swift'
   s.homepage = 'https://github.com/kaandedeoglu/KDCircularProgress'

KDCircularProgress/KDCircularProgress.swift

@@ -37,6 +37,28 @@ public class KDCircularProgress: UIView {
             }
         }
         
+        static func InverseLerp(value: CGFloat, minMax: (CGFloat, CGFloat)) -> CGFloat {
+            return (value - minMax.0) / (minMax.1 - minMax.0)
+        }
+        
+        static func Lerp(value: CGFloat, minMax: (CGFloat, CGFloat)) -> CGFloat {
+            return (minMax.1 - minMax.0) * value + minMax.0
+        }
+        
+        static func ColorLerp(value: CGFloat, minMax: (UIColor, UIColor)) -> UIColor {
+            let clampedValue = Clamp(value, minMax: (0, 1))
+            
+            let zero: CGFloat = 0
+            
+            var (r0, g0, b0, a0) = (zero, zero, zero, zero)
+            minMax.0.getRed(&r0, green: &g0, blue: &b0, alpha: &a0)
+            
+            var (r1, g1, b1, a1) = (zero, zero, zero, zero)
+            minMax.1.getRed(&r1, green: &g1, blue: &b1, alpha: &a1)
+            
+            return UIColor(red: Lerp(clampedValue, minMax: (r0, r1)), green: Lerp(clampedValue, minMax: (g0, g1)), blue: Lerp(clampedValue, minMax: (b0, b1)), alpha: Lerp(clampedValue, minMax: (a0, a1)))
+        }
+        
         static func Mod(value: Int, range: Int, minMax: (Int, Int)) -> Int {
             let (min, max) = minMax
             assert(abs(range) <= abs(max - min), "range should be <= than the interval")
@@ -91,6 +113,12 @@ public class KDCircularProgress: UIView {
         }
     }
     
+    @IBInspectable public var lerpColorMode: Bool = false {
+        didSet {
+            progressLayer.lerpColorMode = lerpColorMode
+        }
+    }
+    
     @IBInspectable public var gradientRotateSpeed: CGFloat = 0 {
         didSet {
             progressLayer.gradientRotateSpeed = gradientRotateSpeed
@@ -204,6 +232,7 @@ public class KDCircularProgress: UIView {
         progressLayer.startAngle = UtilityFunctions.Mod(startAngle, range: 360, minMax: (0,360))
         progressLayer.clockwise = clockwise
         progressLayer.roundedCorners = roundedCorners
+        progressLayer.lerpColorMode = lerpColorMode
         progressLayer.gradientRotateSpeed = gradientRotateSpeed
         progressLayer.glowAmount = UtilityFunctions.Clamp(glowAmount, minMax: (0, 1))
         progressLayer.glowMode = glowMode
@@ -261,7 +290,7 @@ public class KDCircularProgress: UIView {
     }
     
     public func pauseAnimation() {
-        let presentationLayer = progressLayer.presentationLayer() as! KDCircularProgressViewLayer
+        guard let presentationLayer = progressLayer.presentationLayer() as? KDCircularProgressViewLayer else { return }
         let currentValue = presentationLayer.angle
         progressLayer.removeAllAnimations()
         animationCompletionBlock = nil
@@ -319,6 +348,7 @@ public class KDCircularProgress: UIView {
             }
         }
         var roundedCorners: Bool!
+        var lerpColorMode: Bool!
         var gradientRotateSpeed: CGFloat! {
             didSet {
                 invalidateGradientCache()
@@ -366,6 +396,7 @@ public class KDCircularProgress: UIView {
             startAngle = progressLayer.startAngle
             clockwise = progressLayer.clockwise
             roundedCorners = progressLayer.roundedCorners
+            lerpColorMode = progressLayer.lerpColorMode
             gradientRotateSpeed = progressLayer.gradientRotateSpeed
             glowAmount = progressLayer.glowAmount
             glowMode = progressLayer.glowMode
@@ -421,7 +452,7 @@ public class KDCircularProgress: UIView {
             CGContextClipToMask(ctx, bounds, drawMask)
             
             //Gradient - Fill
-            if colorsArray.count > 1 {
+            if !lerpColorMode && colorsArray.count > 1 {
                 var componentsArray: [CGFloat] = []
                 let rgbColorsArray: [UIColor] = colorsArray.map {c in // Make sure every color in colors array is in RGB color space
                     if CGColorGetNumberOfComponents(c.CGColor) == 2 {
@@ -439,11 +470,30 @@ public class KDCircularProgress: UIView {
                 
                 drawGradientWithContext(ctx, componentsArray: componentsArray)
             } else {
-                if colorsArray.count == 1 {
-                    fillRectWithContext(ctx, color: colorsArray[0])
+                
+                var color: UIColor! = nil
+                if colorsArray.count == 0 {
+                    color = UIColor.whiteColor()
+                } else if colorsArray.count == 1 {
+                    color = colorsArray[0]
                 } else {
-                    fillRectWithContext(ctx, color: UIColor(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0))
+                    
+                    // lerpColorMode is true
+                    
+                    let t = CGFloat(reducedAngle) / 360
+                    let steps = colorsArray.count - 1;
+                    let step = 1 / CGFloat(steps);
+                    for i in 1...steps {
+                        let fi = CGFloat(i)
+                        if (t <= fi * step || i == steps) {
+                            let colorT = UtilityFunctions.InverseLerp(t, minMax: ((fi - 1) * step, fi * step))
+                            color = UtilityFunctions.ColorLerp(colorT, minMax: (colorsArray[i - 1], colorsArray[i]));
+                            break;
+                        }
+                    }
                 }
+                
+                fillRectWithContext(ctx, color: color)
             }
             CGContextRestoreGState(ctx)
             UIGraphicsPopContext()

README.md

@@ -34,7 +34,7 @@ view.addSubview(progress)
 ```
 
 ## Installation
-- It's on Cocoapods under the name (you guessed it!) KDCircularProgress
+- It's on CocoaPods under the name (you guessed it!) KDCircularProgress
 - Just drag `KDCircularProgress.swift` into your project. `Carthage` support is on To-do list.
 
 ## Properties
@@ -132,7 +132,7 @@ Prefering light colors in the gradients gives better results. As mentioned befor
 ##To-Do
 - [x] Add example project
 - [ ] Carthage Support
-- [x] Cocoapods Support
+- [x] CocoaPods Support
 - [x] IBDesignable/IBInspectable support
 - [ ] Adding a `progress` property as an alternative to `angle`
 - [ ] Clean up