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Lukas Lipka lipka

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@steipete
steipete / NSData+PSPDFFoundation.m
Last active March 21, 2017 16:00
Haven't done much with dispatch_io yet so I'd appreciate a few more eyeballs on this. Am I closing things correctly in all error conditions? Are there other knobs I could change to make things even faster? (I know I've been lazy on the NSError's)
static NSData *PSPDFCalculateSHA256FromFileURL(NSURL *fileURL, CC_LONG dataLength, NSError **error) {
NSCParameterAssert(fileURL);
dispatch_queue_t shaQueue = dispatch_queue_create("com.pspdfkit.sha256-queue", DISPATCH_QUEUE_SERIAL);
__block dispatch_io_t readChannel;
void (^processIntError)(int intError) = ^(int intError) {
if (intError != 0) {
PSPDFLogWarning(@"Stream error: %d", intError);
if (error) *error = [NSError errorWithDomain:@"SHA256Error" code:100 userInfo:@{NSLocalizedDescriptionKey: @"failed to open file for calculating SHA256."}];
@clementgenzmer
clementgenzmer / FBAnimationPerformanceTracker.h
Last active August 20, 2025 04:49
FBAnimationPerformanceTracker
/*
* This is an example provided by Facebook are for non-commercial testing and
* evaluation purposes only.
*
* Facebook reserves all rights not expressly granted.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON INFRINGEMENT. IN NO EVENT SHALL
* FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
@ssherar
ssherar / UIColorFromRGB.swift
Last active April 18, 2017 21:05
UIColorFromRGB - adapted from http://stackoverflow.com/a/12397366 for Swift
/**
Returns a UIColor object from a Hexadecimal string with a solid colour
i.e.
UIColorFromRGB("#FF0000") == UIColor.redColor()
UIColorFromRGB("#0000FF") == UIColor.blueColor()
UIColorFromRGB("#GGGGGG") == UIColor.blackColor()
UIColorFromRGB("#Hello") == UIColor.blackColor()
@JaviLorbada
JaviLorbada / FRP iOS Learning resources.md
Last active August 14, 2025 01:40
The best FRP iOS resources.

Videos

@jspahrsummers
jspahrsummers / GHRunLoopWatchdog.h
Created January 28, 2015 20:50
A class for logging excessive blocking on the main thread
/// Observes a run loop to detect any stalling or blocking that occurs.
///
/// This class is thread-safe.
@interface GHRunLoopWatchdog : NSObject
/// Initializes the receiver to watch the specified run loop, using a default
/// stalling threshold.
- (id)initWithRunLoop:(CFRunLoopRef)runLoop;
/// Initializes the receiver to detect when the specified run loop blocks for
@andymatuschak
andymatuschak / MultiDirectionAdjudicatingScrollView.swift
Created January 26, 2015 19:31
Source for the Khan Academy app's unusual scrolling interactions
//
// MultiDirectionAdjudicatingScrollView.swift
// Khan Academy
//
// Created by Andy Matuschak on 12/16/14.
// Copyright (c) 2014 Khan Academy. All rights reserved.
//
import UIKit
import UIKit.UIGestureRecognizerSubclass
@patio11
patio11 / annual-prepay.md
Last active February 23, 2024 11:16
Appointment Reminder Annual Pre-pay copy (2014)

Notes

This is the latest version of an email which I send periodically, offering customers the opportunity to pre-pay for SaaS in return for a discount. The benefits to the SaaS company are better cash flow and reduced churn rate. The benefits to the customer are, well, in the email. This genre of email has produced hundreds of thousands of dollars in pre-pays for some companies I work with, and it rarely requires any more work than this example.

I've put $79 is as a placeholder for the cost of the user's plan. We calculate that for each account, naturally, along with the billing contact's name.

Subject: Save $79 on Appointment Reminder (and get a tax write-off) Formatting: 100% plain text. Gmail automatically links up the central link. From: Patrick McKenzie (Appointment Reminder) [email protected]

@steipete
steipete / Macros.h
Last active January 6, 2024 07:24
Declare on your main init that all other init methods should call. It's a nice additional semantic warning. Works with Xcode 5.1 and above. Not tested with earlier variants, but should just be ignored. A reference to this macro shortly appeared in https://developer.apple.com/library/ios/releasenotes/ObjectiveC/ModernizationObjC/AdoptingModernObj…
#ifndef NS_DESIGNATED_INITIALIZER
#if __has_attribute(objc_designated_initializer)
#define NS_DESIGNATED_INITIALIZER __attribute((objc_designated_initializer))
#else
#define NS_DESIGNATED_INITIALIZER
#endif
#endif
@steipete
steipete / PSPDFUIKitMainThreadGuard.m
Last active May 27, 2024 12:11
This is a guard that tracks down UIKit access on threads other than main. This snippet is taken from the commercial iOS PDF framework http://pspdfkit.com, but relicensed under MIT. Works because a lot of calls internally call setNeedsDisplay or setNeedsLayout. Won't catch everything, but it's very lightweight and usually does the job.You might n…
// Taken from the commercial iOS PDF framework http://pspdfkit.com.
// Copyright (c) 2014 Peter Steinberger, PSPDFKit GmbH. All rights reserved.
// Licensed under MIT (http://opensource.org/licenses/MIT)
//
// You should only use this in debug builds. It doesn't use private API, but I wouldn't ship it.
// PLEASE DUPE rdar://27192338 (https://openradar.appspot.com/27192338) if you would like to see this in UIKit.
#import <objc/runtime.h>
#import <objc/message.h>