mackuba

[
  {
    "id": "wwdc2010-118",
    "title": "Mastering Core Data",
    "description": "Core Data contains a vast set of advanced features to help you better manage your data and evolve your application over time. Master the techniques for working with data in your application, from being more efficient to doing more in the database and changing how you store your data over time. Take your Core Data knowledge to the next level.",
    "links": [
      [
        "HD",
        "https://developer.apple.com/devcenter/download.action?path=/videos/wwdc_2010__hd/session_118__mastering_core_data.mov"
      ],

nicolas-miari

import UIKit

extension UIBezierPath {

    /**
     Draws the super-elliptic analog of a rounded rect. Unlike the regular rounded rect, the rounded corners
     are the quadrants of a superellipse (i.e., parabolic segments), _not_ circular arcs.
     If `rect` is a square and `cornerRadius` is equal to half the length or more, and actual superellipse is
     drawn (no straight sections along its boundary) just like doing the same with a rounded rect results in a
     circle being drawn.

mayoff

The attached lldb command pblock command lets you peek inside an Objective-C block. It tries to tell you where to find the source code for the block, and the values captured by the block when it was created.

Consider this example program:

#import <Foundation/Foundation.h>

@interface Foo: NSObject
@end

@implementation Foo

smileyborg

// UICollectionView Objective-C example

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
        
    NSIndexPath *selectedIndexPath = [[self.collectionView indexPathsForSelectedItems] firstObject];
    if (selectedIndexPath != nil) {
        id<UIViewControllerTransitionCoordinator> coordinator = self.transitionCoordinator;
        if (coordinator != nil) {
            [coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) {

Catfish-Man

As of iOS 11/macOS High Sierra, and only including ones in Foundation and CoreFoundation

Strings:

_NSCFString - a CFStringRef or CFMutableStringRef. This is the most common type of string object currently.
    - May have 8 bit (ASCII) or 16 bit (UTF-16) backing store
_NSCFConstantString - a compile time constant CFStringRef, like you'd get with @"foo"
    - May also be generated by dynamic string creation if matches a string in a pre-baked table of common strings called the StringROM
NSBigMutableString - an NSString backed by a CFStorage (https://github.com/opensource-apple/CF/blob/master/CFStorage.h) for faster handling of very large strings
NSCheapMutableString - a very limited NSMutableString that allows for zero-copy initialization. Used in NSFileManager for temporarily wrapping stack buffers.

frankrausch

import Foundation

extension String {
    
    func hyphenated(languageCode: String) -> String {
        let locale = Locale(identifier: languageCode)
        return self.hyphenated(locale: locale)
    }
    
    func hyphenated(locale: Locale) -> String {

0xced

{
  "People" : [
    {
      "Symbol" : "😀",
      "Name" : "GRINNING FACE"
    },
    {
      "Symbol" : "😬",
      "Name" : "GRIMACING FACE"
    },

travisnewby

extension CMDeviceMotion {
    
    func gaze(atOrientation orientation: UIInterfaceOrientation) -> SCNVector4 {
        
        let attitude = self.attitude.quaternion
        let aq = GLKQuaternionMake(Float(attitude.x), Float(attitude.y), Float(attitude.z), Float(attitude.w))
        
        let final: SCNVector4
        
        switch orientation {

jverkoey

import Foundation

extension Dictionary {
  /**
   Returns the value for the given key if it exists, otherwise stores and returns the result of
   withDefault.
   
   Example usage:
   
       var dictionary: [String:[String]] = [:]

nickfrey

@interface UIPreviewForceInteractionProgress : NSObject

- (void)endInteraction:(BOOL)arg1;

@end

@interface UIPreviewInteractionController : NSObject

@property (nonatomic, readonly) UIPreviewForceInteractionProgress *interactionProgressForPresentation;