├── .gitignore
├── LICENSE
├── README.md
├── img
    └── img1.png
├── ios_swift_drawing_app.xcodeproj
    ├── project.pbxproj
    └── project.xcworkspace
    │   ├── contents.xcworkspacedata
    │   └── xcshareddata
    │       └── IDEWorkspaceChecks.plist
├── ios_swift_drawing_app
    ├── AppDelegate.swift
    ├── Base.lproj
    │   ├── LaunchScreen.xib
    │   └── Main.storyboard
    ├── DrawingView.swift
    ├── Images.xcassets
    │   └── AppIcon.appiconset
    │   │   └── Contents.json
    ├── Info.plist
    └── ViewController.swift
└── ios_swift_drawing_appTests
    ├── Info.plist
    └── ios_swift_drawing_appTests.swift


/.gitignore:
--------------------------------------------------------------------------------
 1 | # Xcode
 2 | #
 3 | build/
 4 | *.pbxuser
 5 | !default.pbxuser
 6 | *.mode1v3
 7 | !default.mode1v3
 8 | *.mode2v3
 9 | !default.mode2v3
10 | *.perspectivev3
11 | !default.perspectivev3
12 | xcuserdata
13 | *.xccheckout
14 | *.moved-aside
15 | DerivedData
16 | *.hmap
17 | *.ipa
18 | *.xcuserstate
19 | 
20 | # CocoaPods
21 | #
22 | # We recommend against adding the Pods directory to your .gitignore. However
23 | # you should judge for yourself, the pros and cons are mentioned at:
24 | # http://guides.cocoapods.org/using/using-cocoapods.html#should-i-ignore-the-pods-directory-in-source-control
25 | #
26 | # Pods/
27 | 
28 | # Carthage
29 | #
30 | # Add this line if you want to avoid checking in source code from Carthage dependencies.
31 | # Carthage/Checkouts
32 | 
33 | Carthage/Build
34 | 


--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
 1 | The MIT License (MIT)
 2 | 
 3 | Copyright (c) 2015 Maxim Bilan
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 
23 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
  1 | <h4>iOS Swift Drawing Application Sample</h4>
  2 | 
  3 | A simple example which describes how to draw in the <i>UIView</i> using <i>Swift</i> programming language.
  4 | We need to create the class <i>DrawingView</i> inherited from <i>UIView</i>. With the following properties:
  5 | <pre>
  6 | var drawColor = UIColor.blackColor()	// A color for drawing
  7 | var lineWidth: CGFloat = 5		// A line width
  8 | 	
  9 | private var lastPoint: CGPoint!		// A point for storing the last position
 10 | private var bezierPath: UIBezierPath!	// A bezier path
 11 | private var pointCounter: Int = 0	// A counter of ponts
 12 | private let pointLimit: Int = 128	// A limit of points
 13 | private var preRenderImage: UIImage!	// A pre-render image
 14 | </pre>
 15 | 
 16 | First of all, initialization. We need to create <i>UIBezierPath</i> and set up some properties.
 17 | 
 18 | <pre>
 19 | override init(frame: CGRect) {
 20 | 	super.init(frame: frame)
 21 | 		
 22 | 	initBezierPath()
 23 | }
 24 | 
 25 | required init(coder aDecoder: NSCoder) {
 26 | 	super.init(coder: aDecoder)
 27 | 		
 28 | 	initBezierPath()
 29 | }
 30 | 	
 31 | func initBezierPath() {
 32 | 	bezierPath = UIBezierPath()
 33 | 	bezierPath.lineCapStyle = kCGLineCapRound
 34 | 	bezierPath.lineJoinStyle = kCGLineJoinRound
 35 | }
 36 | </pre>
 37 | 
 38 | For better performance we will store the bezier path rendering to <i>UIImage</i>, so create the function <i>renderToImage</i>.
 39 | <pre>
 40 | func renderToImage() {
 41 | 		
 42 | 	UIGraphicsBeginImageContextWithOptions(self.bounds.size, false, 0.0)
 43 | 	if preRenderImage != nil {
 44 | 		preRenderImage.drawInRect(self.bounds)
 45 | 	}
 46 | 		
 47 | 	bezierPath.lineWidth = lineWidth
 48 | 	drawColor.setFill()
 49 | 	drawColor.setStroke()
 50 | 	bezierPath.stroke()
 51 | 		
 52 | 	preRenderImage = UIGraphicsGetImageFromCurrentImageContext()
 53 | 		
 54 | 	UIGraphicsEndImageContext()
 55 | }
 56 | </pre>
 57 | 
 58 | And implement the rendering function.
 59 | <pre>
 60 | override func drawRect(rect: CGRect) {
 61 | 	super.drawRect(rect)
 62 | 		
 63 | 	if preRenderImage != nil {
 64 | 		preRenderImage.drawInRect(self.bounds)
 65 | 	}
 66 | 		
 67 | 	bezierPath.lineWidth = lineWidth
 68 | 	drawColor.setFill()
 69 | 	drawColor.setStroke()
 70 | 	bezierPath.stroke()
 71 | }
 72 | </pre>
 73 | 
 74 | First, draw the pre-render image and after that render the current bezier path.<br>
 75 | Now, main of our application, it's touch handling.
 76 | 
 77 | In <i>touchesBegan</i> function we save the last point and reset the point counter.
 78 | 
 79 | <pre>
 80 | override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
 81 | 	let touch: AnyObject? = touches.first
 82 | 	lastPoint = touch!.locationInView(self)
 83 | 	pointCounter = 0
 84 | }
 85 | </pre>
 86 | 
 87 | In <i>touchesMoved</i> function, add a point to the bezier path, increment the point counter and if the point counter equals a point limit, than render the bezier path to <i>UIImage</i> and reset the bezier path. And update the screen.
 88 | 
 89 | <pre>
 90 | override func touchesMoved(touches: Set<NSObject>, withEvent event: UIEvent) {
 91 | 	let touch: AnyObject? = touches.first
 92 | 	var newPoint = touch!.locationInView(self)
 93 | 		
 94 | 	bezierPath.moveToPoint(lastPoint)
 95 | 	bezierPath.addLineToPoint(newPoint)
 96 | 	lastPoint = newPoint
 97 | 		
 98 | 	++pointCounter
 99 | 		
100 | 	if pointCounter == pointLimit {
101 | 		pointCounter = 0
102 | 		renderToImage()
103 | 		setNeedsDisplay()
104 | 		bezierPath.removeAllPoints()
105 | 	}
106 | 	else {
107 | 		setNeedsDisplay()
108 | 	}
109 | }
110 | </pre>
111 | 
112 | In <i>touchesEnded</i> function reset the pointer counter, render the bezier path to <i>UIImage</i>, reset the bezier path and update the screen.
113 | 
114 | <pre>
115 | override func touchesEnded(touches: Set<NSObject>, withEvent event: UIEvent) {
116 | 	pointCounter = 0
117 | 	renderToImage()
118 | 	setNeedsDisplay()
119 | 	bezierPath.removeAllPoints()
120 | }
121 | </pre>
122 | 
123 | In <i>touchesCancelled</i> function just call <i>touchesEnded</i>.
124 | 
125 | <pre>
126 | override func touchesCancelled(touches: Set<NSObject>!, withEvent event: UIEvent!) {
127 | 	touchesEnded(touches, withEvent: event)
128 | }
129 | </pre>
130 | 
131 | For clearing the view we need remove all points from the bezier path, reset the pre-render image and update the display:
132 | 
133 | <pre>
134 | func clear() {
135 | 	preRenderImage = nil
136 | 	bezierPath.removeAllPoints()
137 | 	setNeedsDisplay()
138 | }
139 | </pre>
140 | 
141 | And for checking lines on the view:
142 | 
143 | <pre>
144 | func hasLines() -> Bool {
145 | 	return preRenderImage != nil || !bezierPath.empty
146 | }
147 | </pre>
148 | 
149 | That's all and we have really simple drawing application written by <i>Swift</i>.
150 | 


--------------------------------------------------------------------------------
/img/img1.png:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/maximbilan/iOS-Swift-Drawing-App/cd599ac4be90245c399d05252c18bdc4365384a2/img/img1.png


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458 | }
459 | 


--------------------------------------------------------------------------------
/ios_swift_drawing_app.xcodeproj/project.xcworkspace/contents.xcworkspacedata:
--------------------------------------------------------------------------------
1 | <?xml version="1.0" encoding="UTF-8"?>
2 | <Workspace
3 |    version = "1.0">
4 |    <FileRef
5 |       location = "self:ios_swift_drawing_app.xcodeproj">
6 |    </FileRef>
7 | </Workspace>
8 | 


--------------------------------------------------------------------------------
/ios_swift_drawing_app.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist:
--------------------------------------------------------------------------------
1 | <?xml version="1.0" encoding="UTF-8"?>
2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
3 | <plist version="1.0">
4 | <dict>
5 | 	<key>IDEDidComputeMac32BitWarning</key>
6 | 	<true/>
7 | </dict>
8 | </plist>
9 | 


--------------------------------------------------------------------------------
/ios_swift_drawing_app/AppDelegate.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  AppDelegate.swift
 3 | //  ios_swift_drawing_app
 4 | //
 5 | //  Created by Maxim Bilan on 4/29/15.
 6 | //  Copyright (c) 2015 Maxim Bilan. All rights reserved.
 7 | //
 8 | 
 9 | import UIKit
10 | 
11 | @UIApplicationMain
12 | class AppDelegate: UIResponder, UIApplicationDelegate {
13 | 
14 | 	var window: UIWindow?
15 | 
16 | 	func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
17 | 		return true
18 | 	}
19 | 
20 | 	func applicationWillResignActive(_ application: UIApplication) {
21 | 		// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
22 | 		// Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
23 | 	}
24 | 
25 | 	func applicationDidEnterBackground(_ application: UIApplication) {
26 | 		// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
27 | 		// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
28 | 	}
29 | 
30 | 	func applicationWillEnterForeground(_ application: UIApplication) {
31 | 		// Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
32 | 	}
33 | 
34 | 	func applicationDidBecomeActive(_ application: UIApplication) {
35 | 		// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
36 | 	}
37 | 
38 | 	func applicationWillTerminate(_ application: UIApplication) {
39 | 		// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
40 | 	}
41 | 
42 | 
43 | }
44 | 
45 | 


--------------------------------------------------------------------------------
/ios_swift_drawing_app/Base.lproj/LaunchScreen.xib:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="6214" systemVersion="14A314h" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES">
 3 |     <dependencies>
 4 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6207"/>
 5 |         <capability name="Constraints with non-1.0 multipliers" minToolsVersion="5.1"/>
 6 |     </dependencies>
 7 |     <objects>
 8 |         <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
 9 |         <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
10 |         <view contentMode="scaleToFill" id="iN0-l3-epB">
11 |             <rect key="frame" x="0.0" y="0.0" width="480" height="480"/>
12 |             <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
13 |             <subviews>
14 |                 <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="  Copyright (c) 2015 Maxim Bilan. All rights reserved." textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" minimumFontSize="9" translatesAutoresizingMaskIntoConstraints="NO" id="8ie-xW-0ye">
15 |                     <rect key="frame" x="20" y="439" width="441" height="21"/>
16 |                     <fontDescription key="fontDescription" type="system" pointSize="17"/>
17 |                     <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
18 |                     <nil key="highlightedColor"/>
19 |                 </label>
20 |                 <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="ios_swift_drawing_app" textAlignment="center" lineBreakMode="middleTruncation" baselineAdjustment="alignBaselines" minimumFontSize="18" translatesAutoresizingMaskIntoConstraints="NO" id="kId-c2-rCX">
21 |                     <rect key="frame" x="20" y="140" width="441" height="43"/>
22 |                     <fontDescription key="fontDescription" type="boldSystem" pointSize="36"/>
23 |                     <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
24 |                     <nil key="highlightedColor"/>
25 |                 </label>
26 |             </subviews>
27 |             <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
28 |             <constraints>
29 |                 <constraint firstItem="kId-c2-rCX" firstAttribute="centerY" secondItem="iN0-l3-epB" secondAttribute="bottom" multiplier="1/3" constant="1" id="5cJ-9S-tgC"/>
30 |                 <constraint firstAttribute="centerX" secondItem="kId-c2-rCX" secondAttribute="centerX" id="Koa-jz-hwk"/>
31 |                 <constraint firstAttribute="bottom" secondItem="8ie-xW-0ye" secondAttribute="bottom" constant="20" id="Kzo-t9-V3l"/>
32 |                 <constraint firstItem="8ie-xW-0ye" firstAttribute="leading" secondItem="iN0-l3-epB" secondAttribute="leading" constant="20" symbolic="YES" id="MfP-vx-nX0"/>
33 |                 <constraint firstAttribute="centerX" secondItem="8ie-xW-0ye" secondAttribute="centerX" id="ZEH-qu-HZ9"/>
34 |                 <constraint firstItem="kId-c2-rCX" firstAttribute="leading" secondItem="iN0-l3-epB" secondAttribute="leading" constant="20" symbolic="YES" id="fvb-Df-36g"/>
35 |             </constraints>
36 |             <nil key="simulatedStatusBarMetrics"/>
37 |             <freeformSimulatedSizeMetrics key="simulatedDestinationMetrics"/>
38 |             <point key="canvasLocation" x="548" y="455"/>
39 |         </view>
40 |     </objects>
41 | </document>
42 | 


--------------------------------------------------------------------------------
/ios_swift_drawing_app/Base.lproj/Main.storyboard:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="7702" systemVersion="14D136" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
 3 |     <dependencies>
 4 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="7701"/>
 5 |         <capability name="Constraints to layout margins" minToolsVersion="6.0"/>
 6 |     </dependencies>
 7 |     <scenes>
 8 |         <!--View Controller-->
 9 |         <scene sceneID="tne-QT-ifu">
10 |             <objects>
11 |                 <viewController id="BYZ-38-t0r" customClass="ViewController" customModule="ios_swift_drawing_app" customModuleProvider="target" sceneMemberID="viewController">
12 |                     <layoutGuides>
13 |                         <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
14 |                         <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
15 |                     </layoutGuides>
16 |                     <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
17 |                         <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
18 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
19 |                         <subviews>
20 |                             <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="D1t-iV-bdg" customClass="DrawingView" customModule="ios_swift_drawing_app" customModuleProvider="target">
21 |                                 <rect key="frame" x="16" y="38" width="568" height="542"/>
22 |                                 <color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
23 |                             </view>
24 |                         </subviews>
25 |                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
26 |                         <constraints>
27 |                             <constraint firstItem="wfy-db-euE" firstAttribute="top" secondItem="D1t-iV-bdg" secondAttribute="bottom" constant="20" id="2Aa-J8-Lq3"/>
28 |                             <constraint firstItem="D1t-iV-bdg" firstAttribute="leading" secondItem="8bC-Xf-vdC" secondAttribute="leadingMargin" id="3wS-Bd-KOv"/>
29 |                             <constraint firstItem="D1t-iV-bdg" firstAttribute="trailing" secondItem="8bC-Xf-vdC" secondAttribute="trailingMargin" id="80J-gT-OYt"/>
30 |                             <constraint firstItem="D1t-iV-bdg" firstAttribute="top" secondItem="y3c-jy-aDJ" secondAttribute="bottom" constant="18" id="z7c-lL-EVn"/>
31 |                         </constraints>
32 |                     </view>
33 |                     <connections>
34 |                         <outlet property="drawingView" destination="D1t-iV-bdg" id="T54-Se-X80"/>
35 |                     </connections>
36 |                 </viewController>
37 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
38 |             </objects>
39 |         </scene>
40 |     </scenes>
41 | </document>
42 | 


--------------------------------------------------------------------------------
/ios_swift_drawing_app/DrawingView.swift:
--------------------------------------------------------------------------------
  1 | //
  2 | //  DrawingView.swift
  3 | //  ios_swift_drawing_app
  4 | //
  5 | //  Created by Maxim Bilan on 4/29/15.
  6 | //  Copyright (c) 2015 Maxim Bilan. All rights reserved.
  7 | //
  8 | 
  9 | import UIKit
 10 | 
 11 | class DrawingView: UIView {
 12 | 	
 13 | 	var drawColor = UIColor.black
 14 | 	var lineWidth: CGFloat = 5
 15 | 	
 16 | 	private var lastPoint: CGPoint!
 17 | 	private var bezierPath: UIBezierPath!
 18 | 	private var pointCounter: Int = 0
 19 | 	private let pointLimit: Int = 128
 20 | 	private var preRenderImage: UIImage!
 21 | 	
 22 | 	// MARK: - Initialization
 23 | 	
 24 | 	override init(frame: CGRect) {
 25 | 		super.init(frame: frame)
 26 | 		
 27 | 		initBezierPath()
 28 | 	}
 29 | 
 30 | 	required init?(coder aDecoder: NSCoder) {
 31 | 		super.init(coder: aDecoder)
 32 | 		
 33 | 		initBezierPath()
 34 | 	}
 35 | 	
 36 | 	func initBezierPath() {
 37 | 		bezierPath = UIBezierPath()
 38 | 		bezierPath.lineCapStyle = CGLineCap.round
 39 | 		bezierPath.lineJoinStyle = CGLineJoin.round
 40 | 	}
 41 | 	
 42 | 	// MARK: - Touch handling
 43 | 	
 44 | 	override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
 45 | 		let touch: AnyObject? = touches.first
 46 | 		lastPoint = touch!.location(in: self)
 47 | 		pointCounter = 0
 48 | 	}
 49 | 	
 50 | 	override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
 51 | 		let touch: AnyObject? = touches.first
 52 | 		let newPoint = touch!.location(in: self)
 53 | 		
 54 | 		bezierPath.move(to: lastPoint)
 55 | 		bezierPath.addLine(to: newPoint)
 56 | 		lastPoint = newPoint
 57 | 		
 58 | 		pointCounter += 1
 59 | 		
 60 | 		if pointCounter == pointLimit {
 61 | 			pointCounter = 0
 62 | 			renderToImage()
 63 | 			setNeedsDisplay()
 64 | 			bezierPath.removeAllPoints()
 65 | 		}
 66 | 		else {
 67 | 			setNeedsDisplay()
 68 | 		}
 69 | 	}
 70 | 	
 71 | 	override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
 72 | 		pointCounter = 0
 73 | 		renderToImage()
 74 | 		setNeedsDisplay()
 75 | 		bezierPath.removeAllPoints()
 76 | 	}
 77 | 	
 78 | 	override func touchesCancelled(_ touches: Set<UITouch>?, with event: UIEvent?) {
 79 | 		touchesEnded(touches!, with: event)
 80 | 	}
 81 | 	
 82 | 	// MARK: - Pre render
 83 | 	
 84 | 	func renderToImage() {
 85 | 		
 86 | 		UIGraphicsBeginImageContextWithOptions(self.bounds.size, false, 0.0)
 87 | 		if preRenderImage != nil {
 88 | 			preRenderImage.draw(in: self.bounds)
 89 | 		}
 90 | 		
 91 | 		bezierPath.lineWidth = lineWidth
 92 | 		drawColor.setFill()
 93 | 		drawColor.setStroke()
 94 | 		bezierPath.stroke()
 95 | 		
 96 | 		preRenderImage = UIGraphicsGetImageFromCurrentImageContext()
 97 | 		
 98 | 		UIGraphicsEndImageContext()
 99 | 	}
100 | 	
101 | 	// MARK: - Render
102 | 	
103 | 	override func draw(_ rect: CGRect) {
104 | 		super.draw(rect)
105 | 		
106 | 		if preRenderImage != nil {
107 | 			preRenderImage.draw(in: self.bounds)
108 | 		}
109 | 		
110 | 		bezierPath.lineWidth = lineWidth
111 | 		drawColor.setFill()
112 | 		drawColor.setStroke()
113 | 		bezierPath.stroke()
114 | 	}
115 | 
116 | 	// MARK: - Clearing
117 | 	
118 | 	func clear() {
119 | 		preRenderImage = nil
120 | 		bezierPath.removeAllPoints()
121 | 		setNeedsDisplay()
122 | 	}
123 | 	
124 | 	// MARK: - Other
125 | 
126 | 	func hasLines() -> Bool {
127 | 		return preRenderImage != nil || !bezierPath.isEmpty
128 | 	}
129 | 
130 | }
131 | 


--------------------------------------------------------------------------------
/ios_swift_drawing_app/Images.xcassets/AppIcon.appiconset/Contents.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "images" : [
 3 |     {
 4 |       "idiom" : "iphone",
 5 |       "size" : "29x29",
 6 |       "scale" : "2x"
 7 |     },
 8 |     {
 9 |       "idiom" : "iphone",
10 |       "size" : "29x29",
11 |       "scale" : "3x"
12 |     },
13 |     {
14 |       "idiom" : "iphone",
15 |       "size" : "40x40",
16 |       "scale" : "2x"
17 |     },
18 |     {
19 |       "idiom" : "iphone",
20 |       "size" : "40x40",
21 |       "scale" : "3x"
22 |     },
23 |     {
24 |       "idiom" : "iphone",
25 |       "size" : "60x60",
26 |       "scale" : "2x"
27 |     },
28 |     {
29 |       "idiom" : "iphone",
30 |       "size" : "60x60",
31 |       "scale" : "3x"
32 |     },
33 |     {
34 |       "idiom" : "ipad",
35 |       "size" : "29x29",
36 |       "scale" : "1x"
37 |     },
38 |     {
39 |       "idiom" : "ipad",
40 |       "size" : "29x29",
41 |       "scale" : "2x"
42 |     },
43 |     {
44 |       "idiom" : "ipad",
45 |       "size" : "40x40",
46 |       "scale" : "1x"
47 |     },
48 |     {
49 |       "idiom" : "ipad",
50 |       "size" : "40x40",
51 |       "scale" : "2x"
52 |     },
53 |     {
54 |       "idiom" : "ipad",
55 |       "size" : "76x76",
56 |       "scale" : "1x"
57 |     },
58 |     {
59 |       "idiom" : "ipad",
60 |       "size" : "76x76",
61 |       "scale" : "2x"
62 |     }
63 |   ],
64 |   "info" : {
65 |     "version" : 1,
66 |     "author" : "xcode"
67 |   }
68 | }


--------------------------------------------------------------------------------
/ios_swift_drawing_app/Info.plist:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>CFBundleDevelopmentRegion</key>
 6 | 	<string>en</string>
 7 | 	<key>CFBundleExecutable</key>
 8 | 	<string>$(EXECUTABLE_NAME)</string>
 9 | 	<key>CFBundleIdentifier</key>
10 | 	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
11 | 	<key>CFBundleInfoDictionaryVersion</key>
12 | 	<string>6.0</string>
13 | 	<key>CFBundleName</key>
14 | 	<string>$(PRODUCT_NAME)</string>
15 | 	<key>CFBundlePackageType</key>
16 | 	<string>APPL</string>
17 | 	<key>CFBundleShortVersionString</key>
18 | 	<string>1.0</string>
19 | 	<key>CFBundleSignature</key>
20 | 	<string>????</string>
21 | 	<key>CFBundleVersion</key>
22 | 	<string>1</string>
23 | 	<key>LSRequiresIPhoneOS</key>
24 | 	<true/>
25 | 	<key>UILaunchStoryboardName</key>
26 | 	<string>LaunchScreen</string>
27 | 	<key>UIMainStoryboardFile</key>
28 | 	<string>Main</string>
29 | 	<key>UIRequiredDeviceCapabilities</key>
30 | 	<array>
31 | 		<string>armv7</string>
32 | 	</array>
33 | 	<key>UISupportedInterfaceOrientations</key>
34 | 	<array>
35 | 		<string>UIInterfaceOrientationPortrait</string>
36 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
37 | 		<string>UIInterfaceOrientationLandscapeRight</string>
38 | 	</array>
39 | 	<key>UISupportedInterfaceOrientations~ipad</key>
40 | 	<array>
41 | 		<string>UIInterfaceOrientationPortrait</string>
42 | 		<string>UIInterfaceOrientationPortraitUpsideDown</string>
43 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
44 | 		<string>UIInterfaceOrientationLandscapeRight</string>
45 | 	</array>
46 | </dict>
47 | </plist>
48 | 


--------------------------------------------------------------------------------
/ios_swift_drawing_app/ViewController.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  ViewController.swift
 3 | //  ios_swift_drawing_app
 4 | //
 5 | //  Created by Maxim Bilan on 4/29/15.
 6 | //  Copyright (c) 2015 Maxim Bilan. All rights reserved.
 7 | //
 8 | 
 9 | import UIKit
10 | 
11 | class ViewController: UIViewController {
12 | 
13 | 	@IBOutlet weak var drawingView: DrawingView!
14 | 	
15 | 	override func viewDidLoad() {
16 | 		super.viewDidLoad()
17 | 		// Do any additional setup after loading the view, typically from a nib.
18 | 	}
19 | 
20 | 	override func didReceiveMemoryWarning() {
21 | 		super.didReceiveMemoryWarning()
22 | 		// Dispose of any resources that can be recreated.
23 | 	}
24 | 
25 | }
26 | 
27 | 


--------------------------------------------------------------------------------
/ios_swift_drawing_appTests/Info.plist:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>CFBundleDevelopmentRegion</key>
 6 | 	<string>en</string>
 7 | 	<key>CFBundleExecutable</key>
 8 | 	<string>$(EXECUTABLE_NAME)</string>
 9 | 	<key>CFBundleIdentifier</key>
10 | 	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
11 | 	<key>CFBundleInfoDictionaryVersion</key>
12 | 	<string>6.0</string>
13 | 	<key>CFBundleName</key>
14 | 	<string>$(PRODUCT_NAME)</string>
15 | 	<key>CFBundlePackageType</key>
16 | 	<string>BNDL</string>
17 | 	<key>CFBundleShortVersionString</key>
18 | 	<string>1.0</string>
19 | 	<key>CFBundleSignature</key>
20 | 	<string>????</string>
21 | 	<key>CFBundleVersion</key>
22 | 	<string>1</string>
23 | </dict>
24 | </plist>
25 | 


--------------------------------------------------------------------------------
/ios_swift_drawing_appTests/ios_swift_drawing_appTests.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  ios_swift_drawing_appTests.swift
 3 | //  ios_swift_drawing_appTests
 4 | //
 5 | //  Created by Maxim Bilan on 4/29/15.
 6 | //  Copyright (c) 2015 Maxim Bilan. All rights reserved.
 7 | //
 8 | 
 9 | import UIKit
10 | import XCTest
11 | 
12 | class ios_swift_drawing_appTests: XCTestCase {
13 |     
14 |     override func setUp() {
15 |         super.setUp()
16 |         // Put setup code here. This method is called before the invocation of each test method in the class.
17 |     }
18 |     
19 |     override func tearDown() {
20 |         // Put teardown code here. This method is called after the invocation of each test method in the class.
21 |         super.tearDown()
22 |     }
23 |     
24 |     func testExample() {
25 |         // This is an example of a functional test case.
26 |         XCTAssert(true, "Pass")
27 |     }
28 |     
29 |     func testPerformanceExample() {
30 |         // This is an example of a performance test case.
31 |         self.measure() {
32 |             // Put the code you want to measure the time of here.
33 |         }
34 |     }
35 |     
36 | }
37 | 


--------------------------------------------------------------------------------