NSUndoManager
NSUndoManager gives you full undo/redo with almost no code. While you change something, tell the undo manager how to reverse it.
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Development
264 posts
Core Location in iOS 8
iOS 8 introduces significant updates to the Core Location framework, enhancing developer capabilities and user privacy through granular permissions, indoor positioning, and visit monitoring.
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NSOperation
NSOperation is an abstract class for a single unit of work. It manages state, priority, dependencies, and cancellation in a thread-safe way.
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IBAction / IBOutlet / IBOutletCollection
The article explores the roles of IBAction, IBOutlet, and IBOutletCollection in Objective-C development for Cocoa and Cocoa Touch, highlighting their evolution from necessary Interface Builder directives to vestigial yet culturally significant markers.
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MKGeodesicPolyline
MKGeodesicPolyline, added in iOS 7, draws the true shortest path between points on the Earth’s curved surface. On a flat map this appears as a gentle arc instead of a straight line.
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MKTileOverlay, MKMapSnapshotter & MKDirections
iOS 7 quietly brought three powerful new MapKit tools that fixed many old complaints about Apple Maps. Together these solved the biggest developer gripes: ugly base maps, no static map images, and no routing. Even today they remain some of the most generous (and under-used) mapping APIs on iOS.
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NSRange
NSRange is a Foundation struct for a contiguous interval of integers, with location (start) and length. It helps avoid off-by-one errors compared to start/end pairs.
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Multipeer Connectivity
Multipeer Connectivity (introduced in iOS 7) lets nearby iPhones, iPads, and Macs talk directly to each other using Wi-Fi, peer-to-peer Wi-Fi, or Bluetooth. No internet, no server, no central service required.
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NSNotification & NSNotificationCenter
NSNotificationCenter acts as a central hub. Any part of an app can send notices or listen for changes from others. Observers sign up for certain events and get a callback when they happen.
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NSError
NSError is Cocoa's way to handle errors without exceptions. It tells about failures with a code, domain, and userInfo dictionary.
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Key-Value Observing
Key-Value Observing (KVO) has an ugly, wordy API, but it is one of Cocoa’s most powerful features.
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NSHashTable & NSMapTable
NSHashTable acts as a general version of NSSet. It is mutable, holds weak references, can copy items on input, and handles arbitrary pointers using pointer identity for equality and hashing.
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NSPredicate
NSPredicate is a Foundation class that defines logical conditions to fetch or filter data. Its syntax mixes SQL WHERE clauses with regex for expressive queries on collections.
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NSExpression
NSExpression is a class in Cocoa that simplifies complex data tasks. It evaluates mathematical expressions, such as 4 + 5 - 2**3, which gives 1.
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NSEnumerator / NSFastEnumeration
Enumeration makes computation powerful by applying logic to collections.
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NSUUID /CFUUIDRef /UIDevice -uniqueIdentifier /-identifierForVendor
Apple stopped letting apps use the unique device identifier, called UDID, from iOS 5 onwards. Apple blocked new apps using it after May 2013.
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NSCoding / NSKeyedArchiver
Apple gives options like Core Data or NSKeyedArchiver with NSKeyedUnarchiver. These turn objects into data and back again.
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MKLocalSearch
MKLocalSearch lets your app search for places (restaurants, shops, etc.) using normal language, all powered by Apple’s own data.
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NSSecureCoding
NSSecureCoding is a protocol from iOS 6 / OS X Mountain Lion. It adds the class method supportsSecureCoding.
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NSAssertionHandler
In Objective-C, Foundation has macros like NSAssert for methods and NSCAssert for functions. They also have versions for parameters: NSParameterAssert and NSCParameterAssert.
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NSURLCache
NSURLCache is the built-in, automatic HTTP(S) cache used by NSURLConnection, NSURLSession (default/ephemeral configs), and WKWebView.
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NSValue
NSValue is the lightweight way to put any C scalar or struct (int, float, CGPoint, CGRect, NSRange, etc.) into an object so it can live in NSArray, NSDictionary, NSSet, etc.
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NSLocalizedString
NSLocalizedString is a macro in Foundation that gives a localised version of a string. It takes a key to find the string and a comment to help translators.
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KVC Collection Operators
The article discusses Key-Value Coding (KVC) Collection Operators in Objective-C, which provide a concise, Ruby-like syntax for performing aggregate operations on collections using valueForKeyPath:.
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NSOrderedSet
NSOrderedSet is not a subclass of NSSet due to problems with Objective-C's single inheritance and the mutable/immutable class pairs in Foundation's class clusters.
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