Basic extensions

.gitignore

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+### macOS ###
+*.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+
+### Swift ###
+# Xcode
+#
+# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
+
+## Build generated
+build/
+DerivedData/
+
+## Various settings
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata/
+
+## Other
+*.moved-aside
+*.xcuserstate
+
+## Obj-C/Swift specific
+*.hmap
+*.ipa
+*.dSYM.zip
+*.dSYM
+
+## Playgrounds
+timeline.xctimeline
+playground.xcworkspace
+
+# Swift Package Manager
+#
+# Add this line if you want to avoid checking in source code from Swift Package Manager dependencies.
+# Packages/
+.build/
+
+# CocoaPods
+#
+# We recommend against adding the Pods directory to your .gitignore. However
+# you should judge for yourself, the pros and cons are mentioned at:
+# https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
+#
+# Pods/
+
+# Carthage
+#
+# Add this line if you want to avoid checking in source code from Carthage dependencies.
+# Carthage/Checkouts
+
+Carthage/Build
+
+# fastlane
+#
+# It is recommended to not store the screenshots in the git repo. Instead, use fastlane to re-generate the
+# screenshots whenever they are needed.
+# For more information about the recommended setup visit:
+# https://github.com/fastlane/fastlane/blob/master/fastlane/docs/Gitignore.md
+
+fastlane/report.xml
+fastlane/Preview.html
+fastlane/screenshots
+fastlane/test_output
+

Panda.xcodeproj/xcshareddata/xcschemes/Panda.xcscheme

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+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "0810"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "3B2B90071DC70A3E00B4E92F"
+               BuildableName = "Panda.framework"
+               BlueprintName = "Panda"
+               ReferencedContainer = "container:Panda.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+      </Testables>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "3B2B90071DC70A3E00B4E92F"
+            BuildableName = "Panda.framework"
+            BlueprintName = "Panda"
+            ReferencedContainer = "container:Panda.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "3B2B90071DC70A3E00B4E92F"
+            BuildableName = "Panda.framework"
+            BlueprintName = "Panda"
+            ReferencedContainer = "container:Panda.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

Panda/Actions.swift

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+//
+//  Actions.swift
+//  Panda
+//
+//  Created by Javier on 11/1/16.
+//  Copyright © 2016 Javier. All rights reserved.
+//
+
+import UIKit
+
+private class ActionBox {
+    static let triggerSelector = #selector(trigger)
+
+    let action: () -> ()
+
+    init(action: @escaping () -> ()) {
+        self.action = action
+    }
+
+    @objc func trigger() {
+        action()
+    }
+}
+
+extension UIControlEvents: Hashable {
+    public var hashValue: Int { return Int(rawValue) }
+}
+
+private var actionBoxKey: UInt8 = 0
+
+extension UIControl {
+    private var actionBoxes: [UIControlEvents: ActionBox] {
+        get { return objc_getAssociatedObject(self, &actionBoxKey) as? [UIControlEvents: ActionBox] ?? [:] }
+        set { objc_setAssociatedObject(self, &actionBoxKey, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC) }
+    }
+
+    @discardableResult
+    public func action(events: UIControlEvents = .touchUpInside, action: (() -> ())?) -> Self {
+        if let box = actionBoxes[events] {
+            removeTarget(box, action: ActionBox.triggerSelector, for: events)
+            actionBoxes[events] = nil
+        }
+
+        if let action = action {
+            let box = ActionBox(action: action)
+            addTarget(box, action: ActionBox.triggerSelector, for: events)
+            actionBoxes[events] = box
+        }
+
+        return self
+    }
+}
+
+extension UIGestureRecognizer {
+    private var actionBox: ActionBox? {
+        get { return objc_getAssociatedObject(self, &actionBoxKey) as? ActionBox }
+        set { objc_setAssociatedObject(self, &actionBoxKey, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC) }
+    }
+
+    @discardableResult
+    public func action(_ action: (() -> ())?) -> Self {
+        if let box = actionBox {
+            removeTarget(box, action: ActionBox.triggerSelector)
+            actionBox = nil
+        }
+
+        if let action = action {
+            let box = ActionBox(action: action)
+            addTarget(box, action: ActionBox.triggerSelector)
+            actionBox = box
+        }
+
+        return self
+    }
+}

Panda/CGAffineTransformExtensions.swift

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+//
+//  CGAffineTransformExtensions.swift
+//  Panda
+//
+//  Created by Javier on 9/9/16.
+//  Copyright © 2016 Javier. All rights reserved.
+//
+
+import CoreGraphics
+
+extension CGFloat {
+    fileprivate var angleRadian: CGFloat { return self / 180 * CGFloat.pi }
+}
+
+extension CGAffineTransform {
+    public var scale: CGPoint {
+        get { return CGPoint(x: a, y: d) }
+        set { (a, d) = (newValue.x, newValue.y) }
+    }
+
+    public var translation: CGPoint {
+        get { return CGPoint(x: tx, y: ty) }
+        set { (tx, ty) = (newValue.x, newValue.y) }
+    }
+
+    public init(rotationDegree degree: CGFloat) {
+        self.init(rotationAngle: degree.angleRadian)
+    }
+
+    public init(scale: CGFloat) {
+        self.init(scaleX: scale, y: scale)
+    }
+
+    public func rotated(byDegree degree: CGFloat) -> CGAffineTransform {
+        return rotated(by: degree.angleRadian)
+    }
+
+    public func scaled(by scale: CGFloat) -> CGAffineTransform {
+        return scaledBy(x: scale, y: scale)
+    }
+}

Panda/CGContextExtensions.swift

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+//
+//  CGContextExtensions.swift
+//  Panda
+//
+//  Created by Javier on 9/9/16.
+//  Copyright © 2016 Javier. All rights reserved.
+//
+
+import CoreGraphics
+
+extension CGContext {
+    public func flipHorizontally(width: CGFloat) {
+        translateBy(x: width, y: 0)
+        scaleBy(x: -1, y: 1)
+    }
+
+    public func flipVertically(height: CGFloat) {
+        translateBy(x: 0, y: height)
+        scaleBy(x: 1, y: -1)
+    }
+}