GCD Grand Central Dispatch

Introduction

Grand Central Dispatch (GCD) is Apple’s answer to multithreading. It is a lightweight framework for performing tasks synchronously or asynchronously in queues and handles CPU threads for you behind the scenes.

Related Topic: Concurrency

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GCD Grand Central Dispatch:

*GCD Grand Central Dispatch

*Dispatch Semaphore

*Dispatch Group

*Create a dispatch queue

*Getting the Main Queue

*Serial vs Concurrent Dispatch Queues

Table Of Contents

0Getting started with iOS

2Change Status Bar Color

3Passing Data between View Controllers

4Managing the Keyboard

6UILocalNotification

8Checking for Network Connectivity

13UIAlertController

16NSAttributedString

19UINavigationController

21CAGradientLayer

22UIGestureRecognizer

23Custom UIViews from XIB files

24Safari Services

29Swift and Objective-C interoperability

32AVSpeechSynthesizer

33UIBarButtonItem

36NSNotificationCenter

38Networking with Alamofire

39UIViewController

44Checking iOS version

45Universal Links

46UICollectionView

48In-App Purchase

51UITabBarController

52UISearchController

53UIActivityViewController

54Core Location

58UIImagePickerController

59NSUserDefaults

60UIControl - Event Handling with Blocks

62UIPageViewController

64Push Notifications

65Key Value Coding

66Initialization idioms

68Background Modes and Events

72UUID Universally Unique Identifier

74Handling URL Schemes

75Realm database

76ARC Automatic Reference Counting

80SWRevealViewController

81Snapshot of UIView

82DispatchGroup

83GCD Grand Central Dispatch

84Size Classes and Adaptivity

85UIScrollView, AutoLayout

88Debugging Crashes

89UISplitViewController

90UISplitViewController

94XCode Build Archive From Command Line

95Unit Testing with XCTest

97AVPlayer and AVPlayerViewController

99App Transport Security (ATS)

100Core Graphics

102UIDatePicker

107Contacts Framework

108Dynamically updating a UIStackView

109Speech Recognition

110NSURLConnection

112Code signing

113.ipa file to upload on appstore with ApplicationLoader

114Resizing UIImage

115Size Classes and Adaptivity

116MKDistanceFormatter

118GameCenter Leaderboards

120Handle Multiple Environment using Macro

121Set View Background

123Content Hugging

124Google Places API

125Navigation Bar

126UITextField Delegate

127App-wide operations

128UILabel text underlining

129Cut a UIImage into a circle

130Make selective UIView corners rounded

131Convert HTML to NSAttributed string and vice versa

132Convert NSAttributedString to UIImage

133CoreImage Filters

134Face Detection Using CoreImageOpenCV

135MPMediaPickerDelegate

136Graph Coreplot

137NSHTTPCookieStorage

138FCM Messaging

139Create Custom Framework

140Custom Keyboard

142SLComposeViewController

143AirPrint tutorial

147Core SpotLight

150QR Code Scanner

152NSInvocation

153UIRefreshControl TableView

154WCSessionDelegate

156App Submission Process

158UIStoryboard

159Basic text file I/O

160Text To Speech (TTS)

161MPVolumeView

162Objective-C Associated Objects

163Passing Data between View Controllers

165Blocks in Queue with MKBlockQueue

167BackgroundModes

170UIScrollView with StackView child

171Cache online images

172MVP Architecture

173UIKit Dynamics

174Configure Beacons with CoreBluetooth

176Extension for rich Push Notification

177Profiling with Instruments

178Application rating review request

181Simulator Builds

182Simulating Location Using GPX files

183Custom methods of selection of UITableViewCells

184Custom methods of selection of UITableViewCells

185UISegmentedControl

186SqlCipher integration

187Custom UITextField

188Custom UITextField

190Guideline to architecture patterns

191UIFeedbackGenerator

192UIKit Dynamics with UICollectionView

193Multicast Delegates

194Using image assets

195UITableViewCell

196Runtime in Objective-C

197ModelPresentationStyles

198CydiaSubstrate tweak

199Create a video from images

202NSUserActivity

203Rich Notifications

204Load images async

205Adding Swift bridging header

206Creating an App ID

207Changing the rootview controller

208Attributed text in UILabel

209UITableViewController

210Contributors