iOS
- Getting started with iOS
- Learn Tutorial
- Awesome Book
- Awesome Community
- Awesome Course
- Awesome Tutorial
- Awesome YouTube
- 3D Touch
- Accessibility
- ADDING A SWIFT BRIDGING HEADER
- AFNetworking
- AirDrop
- AirPrint tutorial in iOS
- Alamofire
- App Submission Process
- App Transport Security (ATS)
- App wide operations
- AppDelegate
- Application rating/review request
- ARC (Automatic Reference Counting)
- attributedText in UILabel
- Auto Layout
- AVPlayer and AVPlayerViewController
- AVSpeechSynthesizer
- AWS SDK
- Background Modes
- Background Modes and Events
- Basic text file I/O
- Block
- CAAnimation
- Cache online images
- CAGradientLayer
- CALayer
- Carthage iOS Setup
- CAShapeLayer
- Categories
- CGContext Reference
- Chain Blocks in a Queue (with MKBlockQueue)
- Change Status Bar Color
- Checking for Network Connectivity
- Checking iOS version
- CLLocation
- CloudKit
- Codable
- Code signing
- Concurrency
- Configure Beacons with CoreBluetooth
- Contacts Framework
- Content Hugging/Content Compression in Autolayout
- Convert HTML to NSAttributed string and vice verse
- Convert NSAttributedString to UIImage
- Core Data
- Core Graphics
- Core Location
- Core Motion
- Core SpotLight in iOS
- CoreImage Filters
- Create .ipa File to upload on appstore with Applicationloader
- Create a Custom framework in iOS
- Create a video from images
- Creating an App ID
- CTCallCenter
- Custom fonts
- Custom Keyboard
- Custom methods of selection of UITableViewCells
- Custom methods of selection of UITableViewCells
- Custom UITextField
- Custom UIViews from XIB files
- Cut a UIImage into a circle
- CydiaSubstrate tweak
- Debugging Crashes
- Deep Linking in iOS
- DispatchGroup
- Dynamic Type
- Dynamically updating a UIStackView
- EventKit
- Extension for rich Push Notification - iOS 10.
- Face Detection Using CoreImage/OpenCV
- FacebookSDK
- Fastlane
- FCM Messaging in Swift
- FileHandle
- GameCenter Leaderboards
- GameplayKit
- GCD (Grand Central Dispatch)
- Graph (Coreplot)
- Guideline to choose best iOS Architecture Patterns
- Handle Multiple Environment using Macro
- Handling URL Schemes
- Healthkit
- iBeacon
- IBOutlets
- In-App Purchase
- Initialization idioms
- iOS - Implementation of XMPP with Robbie Hanson framework
- iOS 10 Speech Recognition API
- iOS Google Places API
- iOS TTS
- Key Value Coding-Key Value Observation
- Keychain
- Load images async
- Localization
- Make selective UIView corners rounded
- Managing the Keyboard
- MKDistanceFormatter
- MKMapView
- ModelPresentationStyles
- MPMediaPickerDelegate
- MPVolumeView
- Multicast Delegates
- MVP Architecture
- MVVM
- MyLayout
- Navigation Bar
- NSArray
- NSAttributedString
- NSBundle
- NSData
- NSDate
- Convert NSDate that is composed from hour and minute (only) to a full NSDate
- Date Comparison
- Get Current Date
- Get Historic Time from NSDate (eg: 5s ago, 2m ago, 3h ago)
- Get NSDate from JSON Date format "/Date(1268123281843)/"
- Get NSDate Object N seconds from current date
- Get time cycle type (12-hour or 24-hour)
- Get Unix Epoch time
- NSDateFormatter
- UTC Time offset from NSDate with TimeZone
- NSHTTPCookieStorage
- NSInvocation
- NSNotificationCenter
- NSPredicate
- NSTimer
- NSURL
- NSURLConnection
- NSURLSession
- NSUserActivity
- NSUserDefaults
- Objective-C Associated Objects
- OpenGL
- Passing Data between View Controllers
- Passing Data between View Controllers (with MessageBox-Concept)
- PDF Creation in iOS
- plist iOS
- Profile with Instruments
- Push Notifications
- QR Code Scanner
- Realm
- Resizing UIImage
- Rich Notifications
- Runtime in Objective-C
- Safari Services
- Security
- Segues
- Set View Background
- Simulating Location Using GPX files iOS
- Simulator
- Simulator Builds
- SiriKit
- Size Classes and Adaptivity
- Size Classes and Adaptivity
- SLComposeViewController
- Snapshot of UIView
- SqlCipher integration
- StoreKit
- Storyboard
- Swift and Objective-C interoperability
- Swift: Changing the rootViewController in AppDelegate to present main or login/onboarding flow
- SWRevealViewController
- UI Testing
- UIActivityViewController
- UIAlertController
- UIAppearance
- UIBarButtonItem
- UIBezierPath
- UIButton
- UICollectionView
- UIColor
- UIControl - Event Handling with Blocks
- UIDatePicker
- UIDevice
- UIFeedbackGenerator
- UIFont
- UIGestureRecognizer
- UIImage
- UIImagePickerController
- UIImageView
- UIKit Dynamics
- UIKit Dynamics with UICollectionView
- UILabel
- UILabel text underlining
- UILocalNotification
- UINavigationController
- UIPageViewController
- UIPheonix - easy, flexible, dynamic & highly scalable UI framework
- UIPickerView
- UIRefreshControl TableView
- UIScrollView
- UIScrollView AutoLayout
- UIScrollView with StackView child
- UISearchController
- UISegmentedControl
- UISlider
- UISplitViewController
- UISplitViewController
- UIStackView
- UIStoryboard
- UISwitch
- UITabBarController
- UITableView
- UITableViewCell
- UITableViewController
- UITextField
- UITextField Delegate
- UITextView
- UIView
- UIViewController
- UIWebView
- Universal Links
- Using Image Aseets
- UUID (Universally Unique Identifier)
- WCSessionDelegate
- WKWebView
- Xcode Build & Archive From Command Line
- XCTest framework - Unit Testing
Example
Here this will calculate the UTC time offset from current data in desired timezone.
+(NSTimeInterval)getUTCOffSetIntervalWithCurrentTimeZone:(NSTimeZone *)current forDate:(NSDate *)date { NSTimeZone *utcTimeZone = [NSTimeZone timeZoneWithAbbreviation:@"UTC"]; NSInteger currentGMTOffset = [current secondsFromGMTForDate:date]; NSInteger gmtOffset = [utcTimeZone secondsFromGMTForDate:date]; NSTimeInterval gmtInterval = currentGMTOffset - gmtOffset; return gmtInterval; } 
