olegam

This template let's you easily implement a property getter like this:

- (UIView *)myView {
	if (!_myView) {
		_myView = [UIView new];
	}
	return _myView;
}

krzysztofzablocki

#define SafeCall(arg, methodToCall) (arg !=[NSNull null]) ? [arg methodToCall] : nil
 
    int optionalValue = SafeCall([response valueForKey:@"number"], intValue);

ejknapp

javascript:document.querySelector('meta[name=viewport]').setAttribute('content','width=device-width,initial-scale=1.0,maximum-scale=10.0,user-scalable=1');

steipete

// Defines a yet undocumented method to add a warning if super isn't called.
#ifndef NS_REQUIRES_SUPER
#if __has_attribute(objc_requires_super)
#define NS_REQUIRES_SUPER __attribute((objc_requires_super))
#else
#define NS_REQUIRES_SUPER
#endif
#endif

jspahrsummers

#define self \
	( \
		_Pragma("clang diagnostic push") _Pragma("clang diagnostic ignored \"-Wunused-value\"") self, \
		/* Depends on _cmd being a const copy, like other captured variables. */ \
		_Pragma("clang diagnostic pop") (*(_cmd = _cmd, &self)) \
	)

// Replace libextobjc's @weakify with one that's aware of the "self" macro.
#undef ext_weakify_
#define ext_weakify_(INDEX, CONTEXT, VAR) \

mbigatti

//
// Dynamic properties in categories
//
// @see http://www.davidhamrick.com/2012/05/28/Adding-Properties-to-an-Objective-C-Category-Revisted.html
// @see https://twitter.com/nicklockwood/status/384088702768922625
// @see http://www.tuaw.com/2013/04/10/devjuice-better-objective-c-associated-objects/
// @see http://stackoverflow.com/questions/16020918/avoid-extra-static-variables-for-associated-objects-keys
//
// Remember to add #import <objc/runtime.h> in implementation.
//

jfahrenkrug

# in 2013 by Johannes Fahrenkrug, http://springenwerk.com
# See you at WWDC!

require 'rubygems'
require 'open-uri'

class WWDC2013
  def self.announced?
    begin
      indicator_line = open('https://developer.apple.com/wwdc/') do |f|

nicklockwood

Storyboard Segues initially seem like a pretty cool way to construct interfaces using minimal glue code. But actually, ordinary nibs already support this, and in a much more flexible way.

Certainly, a Storyboard lets you bind a button action up to display a view controller with no code, but in practice you will usually want to pass some data to the new controller, depending on which button you used to get there, and this means implementing the -prepareForSegue:sender: method, which rapidly becomes a giant if/elseif statement of doom, negating most of the benefit of the codeless segue:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier isEqualToString:@"modalSegue"])
    {
        ModalViewController *controller = (ModalViewController *)segue.destination;

controller.someProperty = someValue;

steipete

// Defines a yet undocumented method to add a warning if super isn't called.
#ifndef NS_REQUIRES_SUPER
#if __has_attribute(objc_requires_super)
#define NS_REQUIRES_SUPER __attribute((objc_requires_super))
#else
#define NS_REQUIRES_SUPER
#endif
#endif

@interface UIViewController (SubclassingWarnings)

steventroughtonsmith

typedef enum _UIBackgroundStyle {
	UIBackgroundStyleDefault,
	UIBackgroundStyleTransparent,
	UIBackgroundStyleLightBlur,
	UIBackgroundStyleDarkBlur,
	UIBackgroundStyleDarkTranslucent
} UIBackgroundStyle;

@interface UIApplication (UIBackgroundStyle)
-(void)_setBackgroundStyle:(UIBackgroundStyle)style;