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kylestew / NSObject+PWObject.c
Created Feb 24, 2012
Category - Perform Block After Delay
View NSObject+PWObject.c
#import "NSObject+PWObject.h"
@implementation NSObject (PWObject)
- (void)performBlock:(void (^)(void))block afterDelay:(NSTimeInterval)delay {
int64_t delta = (int64_t)(1.0e9 * delay);
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, delta), dispatch_get_main_queue(), block);
mayoff / drawArc.m
Created Apr 7, 2013
Use Core Graphics to draw an arc with a gradient fill, a stroked outline, and a shadow.
View drawArc.m
static UIImage *imageWithSize(CGSize size) {
static CGFloat const kThickness = 20;
static CGFloat const kLineWidth = 1;
static CGFloat const kShadowWidth = 8;
UIGraphicsBeginImageContextWithOptions(size, NO, 0); {
CGContextRef gc = UIGraphicsGetCurrentContext();
CGContextAddArc(gc, size.width / 2, size.height / 2,
(size.width - kThickness - kLineWidth) / 2,
-M_PI / 4, -3 * M_PI / 4, YES);
bomberstudios /
Last active Jun 24, 2020
A list of Sketch plugins hosted at GitHub, in no particular order.
raven / Breakpoints_v2.xcbkptlist
Last active Aug 30, 2019
Symbolic breakpoint for dynamically linking libReveal against UIApplicationMain
View Breakpoints_v2.xcbkptlist
<?xml version="1.0" encoding="UTF-8"?>
type = "2"
version = "2.0">
BreakpointExtensionID = "Xcode.Breakpoint.SymbolicBreakpoint">
shouldBeEnabled = "Yes"
ignoreCount = "0"
View gist:b0c00a889dc2a17efad9
var randomNumbers = [42, 12, 88, 62, 63, 56, 1, 77, 88, 97, 97, 20, 45, 91, 62, 2, 15, 31, 59, 5]
func partition(v: Int[], left: Int, right: Int) -> Int {
var i = left
for j in (left + 1)..(right + 1) {
if v[j] < v[left] {
i += 1
(v[i], v[j]) = (v[j], v[i])
nicklockwood / Hacking UIView Animation
Last active Feb 3, 2020
This article was originally written for issue 12, but didn't make the cut. It was intended to be read in the context of the other articles, so if you aren't familiar with concepts such as CALayer property animations and the role of actionForKey:, read the articles in that issue first.
View Hacking UIView Animation

Hacking UIView animation blocks for fun and profit

In this article, I'm going to explore a way that we can create views that implement custom Core Animation property animations in a natural way.

As we know, layers in iOS come in two flavours: Backing layers and hosted layers. The only difference between them is that the view acts as the layer delegate for its backing layer, but not for any hosted sublayers.

In order to implement the UIView transactional animation blocks, UIView disables all animations by default and then re-enables them individually as required. It does this using the actionForLayer:forKey: method.

Somewhat strangely, UIView doesn't enable animations for every property that CALayer does by default. A notable example is the layer.contents property, which is animatable by default for a hosted layer, but cannot be animated using a UIView animation block.

irace / gist:927f843cb0f683a7f2c2
Created Aug 13, 2014
New iOS 8 APIs don't allow you to use a custom presentation controller for compact devices, in conjunction with a popover on "normal" size class devices
View gist:927f843cb0f683a7f2c2
// ViewController.m
// PopoverPresentationControllerExample
// Created by Bryan Irace on 8/8/14.
// Copyright (c) 2014 Bryan Irace. All rights reserved.
#import "CustomCompactPresentationController.h"
#import "ViewController.h"
jpsim / MyTableViewController.m
Created Aug 19, 2014
Grouped UITableView using Realm
View MyTableViewController.m
// Copyright 2014 Realm Inc.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
alvesjtiago / gist:e2c61eb288c9d488a8cc
Last active Aug 29, 2015
Remove alpha channel and transparencies from images for AppStore screenshots.
View gist:e2c61eb288c9d488a8cc
# Run the following code on a folder that contains all your images
for f in *.png; do convert "$f" -background white -alpha remove -flatten -alpha off "$f"; done
View Simple Scrolling UIStackView
// SimpleScrollingStack.swift
// A super-simple demo of a scrolling UIStackView in iOS 9
// Created by Paul Hudson on 10/06/2015.
// Learn Swift at
// @twostraws
import UIKit
You can’t perform that action at this time.