nyoron

/*
	Some sample code for a horizontal paged UIScrollView with a gap between each image (which looks nicer). Note - not using contentInset, we want each page to fill the iPhone screen and the gap only to be visible when scrolling (like Photos.app).
	
	Taking the iPhone status bar into account - our viewport is 320x460
	Our UIScrollView is therefore set in Interface Builder to 340x460 with a -10 X offset (so it's larger than the viewport but still centred)
	
	Then we do the following...
*/

// Our image filenames

cppforlife

[schwa@ungoliant] ~$ export OBJC_HELP=1
[schwa@ungoliant] ~$ /Applications/Safari.app/Contents/MacOS/Safari 
objc[10559]: Objective-C runtime debugging. Set variable=YES to enable.
objc[10559]: OBJC_HELP: describe available environment variables
objc[10559]: OBJC_PRINT_OPTIONS: list which options are set
objc[10559]: OBJC_PRINT_IMAGES: log image and library names as they are loaded
objc[10559]: OBJC_PRINT_LOAD_METHODS: log calls to class and category +load methods
objc[10559]: OBJC_PRINT_INITIALIZE_METHODS: log calls to class +initialize methods
objc[10559]: OBJC_PRINT_RESOLVED_METHODS: log methods created by +resolveClassMethod: and +resolveInstanceMethod:
objc[10559]: OBJC_PRINT_CLASS_SETUP: log progress of class and category setup

chochos

apply plugin:'scala'

repositories {
  mavenLocal()
  mavenCentral()
  //This repo is for the Finagle jars
  mavenRepo urls:'http://maven.twttr.com'
}

dependencies {

steipete

- (void)dealloc {
    webView_.delegate = nil; // delegate is self here, so first set to nil before call stopLoading.
    [webView_ stopLoading];
    
    // UIWebView must be released in the main thread, or we get:
    // Tried to obtain the web lock from a thread other than the main thread or the web thread. This may be a result of calling to UIKit from a secondary thread. Crashing now...
    // This is less evil than the proposed http://stackoverflow.com/questions/945082/uiwebview-in-multithread-viewcontroller
    // Calling removeFromSuperview in a dealloc is ugly and evil, but else UIView has a strong reference to UIWebView and our main-release call would be irrelevant.
    if (![NSThread isMainThread]) {
        [webView_ performSelectorOnMainThread:@selector(removeFromSuperview) withObject:nil waitUntilDone:YES];        

jimbojsb

Step 0:

Get Homebrew installed on your mac if you don't already have it

Step 1:

Install highlight. "brew install highlight". (This brings down Lua and Boost as well)

Step 2:

odrobnik

// UIImageJPEGRepresentation

NSData *data = UIImageJPEGRepresentation(tileImage, 0.71);
[data writeToURL:cacheURL atomically:YES];


// ImageIO

#import <ImageIO/ImageIO.h>
#import <MobileCoreServices/UTCoreTypes.h>

ksm

/* 
Source: Apple Developer - Understanding iOS View Compositing
*/

// setup the layer
CALayer *layer = view.layer;
layer.bounds = sublayer_bounds;
layer.backgroundColor = random_color();

// set the shadow properties on the layer

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

hezi

// Declare enums like so:
#define IMAGE_STATUS(XX)  \
XX(kDOImageStatusOK, = 0) \
XX(kDOImageStatusCached, )\
XX(kDOImageStatusRetry, ) 
DECLARE_ENUM(DOImageStatus, IMAGE_STATUS)

steipete

nline void pspdf_dispatch_sync_reentrant(dispatch_queue_t queue, dispatch_block_t block) {
    dispatch_get_current_queue() == queue ? block() : dispatch_sync(queue, block);
}