Merge pull request #3 from cruisediary/fix-bundle-issue

Fix bundle resource issue

Comets.podspec

@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = 'Comets'
-  s.version          = '0.1.0'
+  s.version          = '0.1.1'
   s.summary          = '☄️Comets: Animating Particles in Swift'
 
 # This description is used to generate tags and improve search results.
@@ -28,4 +28,4 @@ Pod::Spec.new do |s|
   s.ios.deployment_target = '9.0'
   s.source_files = 'Comets/Sources/**/*'
 
-end
+end

Comets/Sources/Comet.swift

@@ -3,6 +3,12 @@ public struct Comet {
     public var endPoint: CGPoint
     public var lineColor: UIColor
 
+    public init(startPoint: CGPoint, endPoint: CGPoint, lineColor: UIColor) {
+        self.startPoint = startPoint
+        self.endPoint = endPoint
+        self.lineColor = lineColor
+    }
+
     public var linePath: UIBezierPath {
         let path = UIBezierPath()
         path.move(to: startPoint)
@@ -14,7 +20,7 @@ public struct Comet {
         // create the line as a CAShapeLayer
         let lineLayer = CAShapeLayer()
         lineLayer.path = linePath.cgPath
-        lineLayer.lineWidth = 4
+        lineLayer.lineWidth = 0.5
         lineLayer.strokeColor = lineColor.cgColor
         return lineLayer
     }
@@ -27,9 +33,7 @@ public struct Comet {
 
         // create comet cell
         let cell = CAEmitterCell()
-        cell.contents = UIImage(named: "Comet")?
-            .rotate(radians: calculateAngle())?
-            .cgImage
+        cell.contents = contents
         cell.birthRate = 0.2 * Float(Int.random(in: 500 ... 2000 )) / 1000
         cell.lifetime = 10.0
         cell.velocity = 600
@@ -41,6 +45,24 @@ public struct Comet {
         return emitter
     }
 
+    public var contents: Any? {
+        let cometLayer = CAGradientLayer()
+        cometLayer.colors = [UIColor.white.withAlphaComponent(0.0).cgColor, UIColor.white.cgColor]
+        cometLayer.cornerRadius = 0.25
+        cometLayer.frame = CGRect(x: 0, y: 0, width: 80, height: 0.5)
+        cometLayer.locations = [0.0, 1.0]
+        cometLayer.startPoint = CGPoint(x: 0, y: 0.5)
+        cometLayer.endPoint = CGPoint(x: 1.0, y: 0.5)
+
+        UIGraphicsBeginImageContextWithOptions(cometLayer.bounds.size, cometLayer.isOpaque, 0.0)
+        defer { UIGraphicsEndImageContext() }
+        guard let context = UIGraphicsGetCurrentContext() else { return nil }
+        cometLayer.render(in: context)
+        return UIGraphicsGetImageFromCurrentImageContext()?
+            .rotate(radians: calculateAngle())?
+            .cgImage
+    }
+
     public func calculateAngle() -> CGFloat {
         let deltaX = endPoint.x - startPoint.x
         let deltaY = endPoint.y - startPoint.y