rsaunders100’s gists

rsaunders100 / gist:282a18b7d54d479ba13d

Last active August 29, 2015 14:21

	NSURL *url = [NSURL URLWithString:@"https://google.co.uk"];
	NSURLRequest *request = [NSURLRequest requestWithURL:url];

	NSError *error;
	[NSURLConnection sendSynchronousRequest:request
	returningResponse:nil
	error:&error];
	NSLog(@"NSURLConnection error: %@", error.localizedDescription);

	[[[NSURLSession sharedSession]

rsaunders100 / gist:8972207

Created February 13, 2014 09:24

NSDateFormatter reuse

	// For NSString to NSDate to parse server dates in the full ISO 8601 format
	// E.g. 2014-02-11T10:22:46+00:00
	+ (NSDateFormatter *) iso8601FullDateFromatter
	{
	static NSDateFormatter * dateFormatter;

	static dispatch_once_t onceToken;
	dispatch_once(&onceToken, ^{

	dateFormatter = [[NSDateFormatter alloc] init];

rsaunders100 / gist:8711151

Created January 30, 2014 15:35

Wrap HTML with a given UIColor and UIFont

	+ (NSString )htmlFromBodyString:(NSString )htmlBodyString
	textFont:(UIFont *)font
	textColor:(UIColor *)textColor
	{
	int numComponents = CGColorGetNumberOfComponents([textColor CGColor]);

	NSAssert(numComponents == 4 \|\| numComponents == 2, @"Unsupported color format");

	// E.g. FF00A5
	NSString *colorHexString = nil;

rsaunders100 / gist:8436798

Created January 15, 2014 14:03

To prevent application logic from interfering with unit tests.

	static BOOL isRunningTests(void) __attribute__((const));

	- (BOOL)application:(UIApplication *)application
	didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
	{
	if (isRunningTests()) {
	return YES;
	}

	//

rsaunders100 / gist:8269049

Created January 5, 2014 14:47

Timed Scope Smoothed

	CFAbsoluteTime startTimeStamp = CFAbsoluteTimeGetCurrent();

	<#code to time#>

	static NSTimeInterval smoothedTimeTaken = 0.0;
	NSTimeInterval timeTaken = (CFAbsoluteTimeGetCurrent() - startTimeStamp);
	if (smoothedTimeTaken == 0) smoothedTimeTaken = timeTaken;
	else smoothedTimeTaken = smoothedTimeTaken * 0.9 + timeTaken * 0.1;

	NSLog(@"Took %0.1f ms (smoothed) to <#name of task#>", smoothedTimeTaken * 1000);

rsaunders100 / ExampleUnitTest.m

Created December 4, 2013 12:15

How to unit an objective C class with an async callback.

	- (void)testAsyncExample
	{
	dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
	__block BOOL hasRunBlock = NO;

	[MyClass asyncCallback:^{

	hasRunBlock = YES;
	dispatch_semaphore_signal(semaphore);
	}];

rsaunders100 / gist:6160147

Created August 5, 2013 22:25

Logs all unicode character with numeric value up to and including 2^16

	+ (void) logCharacterSet:(NSCharacterSet*)characterSet
	{
	unichar unicharBuffer[20];
	int index = 0;

	for (unichar uc = 0; uc < (0xFFFF); uc ++)
	{
	if ([characterSet characterIsMember:uc])
	{
	unicharBuffer[index] = uc;

rsaunders100 / gist:6094708

Created July 27, 2013 12:14

Core image rendering on a EAGLContext

	// View controller is a subclass of GLKViewController

	- (void)viewDidLoad
	{
	[super viewDidLoad];

	self.eaglContext = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];

	self.ciContext = [CIContext
	contextWithEAGLContext:self.eaglContext

rsaunders100 / gist:6056183

Created July 22, 2013 18:17

Demonstrates the various NSDataWritingOptions. Should be used with a program like iExplorer to see how these file behave. http://www.macroplant.com/iexplorer/

	[MyClass writeStringWithFileName:@"Complete"
	option:NSDataWritingFileProtectionComplete];

	[MyClass writeStringWithFileName:@"CompleteUnlessOpen"
	option:NSDataWritingFileProtectionCompleteUnlessOpen];

	[MyClass writeStringWithFileName:@"CompleteUntilFirstUserAuthentication"
	option:NSDataWritingFileProtectionCompleteUntilFirstUserAuthentication];

	[MyClass writeStringWithFileName:@"None"

rsaunders100 / UIImage+Transform.h

Created October 4, 2012 17:25

Transform an image threadsafe

	//
	// UIImage+Transform.h
	// TestImage
	//
	// Created by Robert Saunders on 04/10/2012.
	// Copyright (c) 2012 Robert Saunders. All rights reserved.
	//

	#import <UIKit/UIKit.h>

Rob Saunders rsaunders100