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chriseidhof / TypedExpr.swift
Last active Feb 3, 2018
Typed Expressions in Swift
View TypedExpr.swift
// Variables just contain an integer. We can have a maximum of `Int.max` variables in our program. ¯\_(ツ)_/¯
private struct Var {
static var freshVarIx = 0
let ix: Int
init() {
ix = Var.freshVarIx
View gist:bdcd22e277fa957162d5
typealias verFunc = @convention(c) ()->UnsafePointer<CChar>
let libz = dlopen("libz.dylib", RTLD_LAZY)
let ret = dlsym(libz, "zlibVersion")
let zLibVersion = unsafeBitCast(ret, verFunc.self)
andymatuschak / CollectionViewDataSource.swift
Last active Feb 12, 2021
Type-safe value-oriented collection view data source
View CollectionViewDataSource.swift
// CollectionViewDataSource.swift
// Khan Academy
// Created by Andy Matuschak on 10/14/14.
// Copyright (c) 2014 Khan Academy. All rights reserved.
import UIKit
chriseidhof / parsing.swift
Last active Feb 13, 2021
JSON Parsing in Swift
View parsing.swift
// This code accompanies a blog post:
// As of Beta5, the >>= operator is already defined, so I changed it to >>>=
import Foundation
let parsedJSON : [String:AnyObject] = [
"stat": "ok",
"blogs": [
hectormatos2011 / UIGestureRecognizer+Closures.swift
Last active Dec 24, 2016
View UIGestureRecognizer+Closures.swift
// UIGestureRecognizer+Closures.swift
// Closures
// Created by Hector on 7/23/14.
// Copyright (c) 2014 Hector Matos. All rights reserved.
import Foundation
chriseidhof /
Created Jun 28, 2014
MobileOptimized Presentation

[fit] Functional Programming in

[fit] Swift

Chris Eidhof - - June 28, Minsk

steipete / UITableViewMore.m
Last active Jan 29, 2018
Using the "More" button. Of course the simple way that Apple uses in Mail/iOS is not public. rdar://16600859
View UITableViewMore.m
- (NSString *)tableView:(UITableView *)tableView titleForSwipeAccessoryButtonForRowAtIndexPath:(NSIndexPath *)indexPath {
return @"More";
- (void)tableView:(UITableView *)tableView swipeAccessoryButtonPushedForRowAtIndexPath:(NSIndexPath *)indexPath {
NSLog(@"I wanted to be a pretty public API, but then time ran out and they forgot me...");
// Hide the More/Delete menu.
[self setEditing:NO animated:YES];
steipete / PSPDFThreadSafeMutableDictionary.m
Created Dec 2, 2013
Dictionary subclass whose primitive operations are thread safe. Most of the time you don't want locking at the collection level, but there are valid use cases for this, and it's interesting how to properly subclass the NSDictionary class cluster. We're using SpinLocks here, since it's highly unlikely that any of the operation locks for more than…
View PSPDFThreadSafeMutableDictionary.m
@interface PSPDFThreadSafeMutableDictionary : NSMutableDictionary
#import "PSPDFThreadSafeMutableDictionary.h"
#import <libkern/OSAtomic.h>
@implementation PSPDFThreadSafeMutableDictionary {
OSSpinLock _lock;
NSMutableDictionary *_dictionary; // Class Cluster!
steipete / CaseInsensitiveDictionary.m
Created Dec 1, 2013
Implemented as a category on NSDictionary.
View CaseInsensitiveDictionary.m
static Boolean PSPDFCaseInsensitiveEqualCallback(const void *a, const void *b) {
id objA = (__bridge id)a, objB = (__bridge id)b;
Boolean ret = FALSE;
if ([objA isKindOfClass:NSString.class] && [objB isKindOfClass:NSString.class]) {
ret = ([objA compare:objB options:NSCaseInsensitiveSearch|NSLiteralSearch] == NSOrderedSame);
}else {
ret = [objA isEqual:objB];
return ret;
steipete / PSPDFUIKitMainThreadGuard.m
Last active Oct 18, 2021
This is a guard that tracks down UIKit access on threads other than main. This snippet is taken from the commercial iOS PDF framework, 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…
View PSPDFUIKitMainThreadGuard.m
// Taken from the commercial iOS PDF framework
// Copyright (c) 2014 Peter Steinberger, PSPDFKit GmbH. All rights reserved.
// Licensed under 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 ( if you would like to see this in UIKit.
#import <objc/runtime.h>
#import <objc/message.h>