Update Swift 4.2

Author: cemolcay

LiveKnob.podspec

@@ -16,8 +16,9 @@ Pod::Spec.new do |s|
   #
 
   s.name         = "LiveKnob"
-  s.version      = "0.0.2"
+  s.version      = "0.0.3"
   s.summary      = "Yet another knob for iOS but with IBDesignable and Ableton Live style."
+  s.swift_version = "4.2"
 
   # This description is used to generate tags and improve search results.
   #   * Think: What does it do? Why did you write it? What is the focus?

LiveKnob.xcodeproj/project.pbxproj

@@ -291,7 +291,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.cemolcay.LiveKnob;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
@@ -307,7 +307,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.cemolcay.LiveKnob;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;

LiveKnob/AppDelegate.swift

@@ -13,8 +13,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
 
   var window: UIWindow?
 
-
-  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
+  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
     // Override point for customization after application launch.
     return true
   }

LiveKnob/LiveKnob.swift

@@ -125,19 +125,19 @@ public enum LiveKnobControlType: Int, Codable {
     let radius = (min(baseLayer.bounds.width, baseLayer.bounds.height) / 2) - baseLineWidth
     let ring = UIBezierPath(arcCenter: center, radius: radius, startAngle: startAngle, endAngle: endAngle, clockwise: true)
     baseLayer.path = ring.cgPath
-    baseLayer.lineCap = kCALineCapRound
+    baseLayer.lineCap = .round
 
     // Draw pointer.
     let pointer = UIBezierPath()
     pointer.move(to: center)
     pointer.addLine(to: CGPoint(x: center.x + radius, y: center.y))
     pointerLayer.path = pointer.cgPath
-    pointerLayer.lineCap = kCALineCapRound
+    pointerLayer.lineCap = .round
 
     let angle = CGFloat(angleForValue(value))
     let progressRing = UIBezierPath(arcCenter: center, radius: radius, startAngle: startAngle, endAngle: angle, clockwise: true)
     progressLayer.path = progressRing.cgPath
-    progressLayer.lineCap = kCALineCapRound
+    progressLayer.lineCap = .round
 
     // Draw pointer
     CATransaction.begin()