Essential Books

Clearing NSUserDefaults

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Swift 

let bundleIdentifier = NSBundle.mainBundle().bundleIdentifier()

NSUserDefaults.standardUserDefaults().removePersistentDomainForName(bundleIdentifier)

Objective-C 

NSString *bundleIdentifier = [[NSBundle mainBundle] bundleIdentifier];

[[NSUserDefaults standardUserDefaults] removePersistentDomainForName: bundleIdentifier];
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NSUserDefaults:
*NSUserDefaults
*Setting values
*Use Managers to Save and Read Data
*UserDefaults uses in Swift 3
*Getting Default Values
*Saving Values
*Clearing NSUserDefaults
Table Of Contents
0Getting started with iOS
1UILabel
2Change Status Bar Color
3Passing Data between View Controllers
4Managing the Keyboard
5UIButton
6UILocalNotification
7UIImageView
8Checking for Network Connectivity
9Accessibility
10UITableView
11Auto Layout
12UIView
13UIAlertController
14MKMapView
15UIColor
16NSAttributedString
17CAAnimation
18UITextView
19UINavigationController
20Concurrency
21CAGradientLayer
22UIGestureRecognizer
23Custom UIViews from XIB files
24Safari Services
25UIStackView
26UIImage
27UIWebView
28CALayer
29Swift and Objective-C interoperability
30NSDate
31Custom Fonts
32AVSpeechSynthesizer
33UIBarButtonItem
34UIScrollView
35Localization
36NSNotificationCenter
37UITextField
38Networking with Alamofire
39UIViewController
40iBeacon
41CLLocation
42NSURLSession
43UISwitch
44Checking iOS version
45Universal Links
46UICollectionView
47PDF Creation
48In-App Purchase
49NSTimer
50CGContext
51UITabBarController
52UISearchController
53UIActivityViewController
54Core Location
55FacebookSDK
56AFNetworking
57CTCallCenter
58UIImagePickerController
59NSUserDefaults
60UIControl - Event Handling with Blocks
61UIBezierPath
62UIPageViewController
63UIAppearance
64Push Notifications
65Key Value Coding
66Initialization idioms
67Storyboard
68Background Modes and Events
69Fastlane
70CAShapeLayer
71WKWebView
72UUID Universally Unique Identifier
73Categories
74Handling URL Schemes
75Realm database
76ARC Automatic Reference Counting
77UIPickerView
78Dynamic Type
79NSURL
80SWRevealViewController
81Snapshot of UIView
82DispatchGroup
83GCD Grand Central Dispatch
84Size Classes and Adaptivity
85UIScrollView, AutoLayout
86IBOutlets
87AWS SDK
88Debugging Crashes
89UISplitViewController
90UISplitViewController
91UIDevice
92CloudKit
93GameplayKit
94XCode Build Archive From Command Line
95Unit Testing with XCTest
96NSData
97AVPlayer and AVPlayerViewController
98Deep Linking
99App Transport Security (ATS)
100Core Graphics
101Segues
102UIDatePicker
103NSPredicate
104EventKit
105NSBundle
106SiriKit
107Contacts Framework
108Dynamically updating a UIStackView
109Speech Recognition
110NSURLConnection
111StoreKit
112Code signing
113.ipa file to upload on appstore with ApplicationLoader
114Resizing UIImage
115Size Classes and Adaptivity
116MKDistanceFormatter
1173D Touch
118GameCenter Leaderboards
119Keychain
120Handle Multiple Environment using Macro
121Set View Background
122Block
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
141AirDrop
142SLComposeViewController
143AirPrint tutorial
144UISlider
145Carthage
146HealthKit
147Core SpotLight
148UI Testing
149Core Motion
150QR Code Scanner
151plist
152NSInvocation
153UIRefreshControl TableView
154WCSessionDelegate
155AppDelegate
156App Submission Process
157MVVM
158UIStoryboard
159Basic text file I/O
160Text To Speech (TTS)
161MPVolumeView
162Objective-C Associated Objects
163Passing Data between View Controllers
164UIPhoenix
165Blocks in Queue with MKBlockQueue
166Simulator
167BackgroundModes
168NSArray
169OpenGL
170UIScrollView with StackView child
171Cache online images
172MVP Architecture
173UIKit Dynamics
174Configure Beacons with CoreBluetooth
175Core Data
176Extension for rich Push Notification
177Profiling with Instruments
178Application rating review request
179MyLayout
180UIFont
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
189Security
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
200Codable
201FileHandle
202NSUserActivity
203Rich Notifications
204Load images async
205Adding Swift bridging header
206Creating an App ID
207Changing the rootview controller
208Attributed text in UILabel
209UITableViewController
210Contributors