tonious

/* Read this comment first: https://gist.github.com/tonious/1377667#gistcomment-2277101
 * 2017-12-05
 * 
 *  -- T.
 */

#define _XOPEN_SOURCE 500 /* Enable certain library functions (strdup) on linux.  See feature_test_macros(7) */

#include <stdlib.h>
#include <stdio.h>

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

andrewsardone

CocoaPods project setup

Create a Podfile at the root of your project

platform :ios, '5.0'

pod 'AFNetworking'
pod 'OHAttributedLabel'

martinsik

#import <Foundation/Foundation.h>

@interface MyCalendar : NSObject

+ (void)requestAccess:(void (^)(BOOL granted, NSError *error))success;
+ (BOOL)addEventAt:(NSDate*)eventDate withTitle:(NSString*)title inLocation:(NSString*)location;

@end

veeneck

// Imagine shooting an arrow to a point
CGMutablePathRef path = CGPathCreateMutable();

// This will move an invisible path marker to a starting point
// In my case, the node is a child node of a sprite, so it is the local coords and not the screen coords
CGPathMoveToPoint(path, NULL, 10, 0);

// The 3-8th parameters are x/y coords. The arrow iwll first hit x:100 and y:50.
// It will then raise up a bit as it keeps going and finally drop to the target at x:300 y:0
CGPathAddCurveToPoint(path, NULL,

KeyMaster-

//Copyright (c) 2014 Tilman Schmidt (@KeyMaster_)

//Permission is hereby granted, free of charge, to any person obtaining a copy
//of this software and associated documentation files (the "Software"), to deal
//in the Software without restriction, including without limitation the rights
//to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//copies of the Software, and to permit persons to whom the Software is
//furnished to do so, subject to the following conditions:

//The above copyright notice and this permission notice shall be included in

nicklockwood

Suppose we want to add support for a new iOS 8 API in our framework that replaces an older iOS 7 API. There are a few problems we might face:

1. The new API will crash if we call it on iOS 7
2. The new API won't compile if we build it using the iOS 7 SDK
3. The old API will raise a deprecation warning if built with a deployment target of iOS 8 and up

These three problems require three different technical solutions:

1. We can avoid calling the new API on an old OS version by using runtime detection (e.g. respondsToSelector:)
2. We can avoid compiling new APIs on old SDKs using the __IPHONE_OS_VERSION_MAX_ALLOWED macro

genedelisa

    func loopTrack(musicTrack:MusicTrack)   {

        var trackLength = getTrackLength(musicTrack)
        println("track length is \(trackLength)")
        setTrackLoopDuration(musicTrack, duration: trackLength)
    }
    
    func getTrackLength(musicTrack:MusicTrack) -> MusicTimeStamp {
        
        //The time of the last music event in a music track, plus time required for note fade-outs and so on.

asarode

func generateRandomColor() -> UIColor {
  let hue : CGFloat = CGFloat(arc4random() % 256) / 256 // use 256 to get full range from 0.0 to 1.0
  let saturation : CGFloat = CGFloat(arc4random() % 128) / 256 + 0.5 // from 0.5 to 1.0 to stay away from white
  let brightness : CGFloat = CGFloat(arc4random() % 128) / 256 + 0.5 // from 0.5 to 1.0 to stay away from black
        
  return UIColor(hue: hue, saturation: saturation, brightness: brightness, alpha: 1)
}

perlmunger

func checkShouldDownloadFileAtLocation(urlString:String, completion:((shouldDownload:Bool) -> ())?) {
    var request = NSMutableURLRequest(URL: NSURL(string: urlString)!)
    request.HTTPMethod = "HEAD"
    var session = NSURLSession.sharedSession()
    
    var err: NSError?
    
    var task = session.dataTaskWithRequest(request, completionHandler: { [weak self] data, response, error -> Void in
        if let strongSelf = self {
            var isModified = false