mikeash

// clang -framework Foundation -fobjc-arc -O3 test.m

#import <Foundation/Foundation.h>


@interface Slice : NSObject
@property NSInteger start;
@property NSInteger length;
@end
@implementation Slice

radianttap

+ (void)pulseView:(UIView *)view completion:(void (^)(void))block {

	// if you use auto layout, view-based transform go haywire, as they trigger layoutSubviews
	// consequence is that you have no idea where the view will end up on the screen once animation completes
	// see this discussion: http://stackoverflow.com/questions/12943107/how-do-i-adjust-the-anchor-point-of-a-calayer-when-auto-layout-is-being-used

	// thus (per solution 4 from link above), rewriting with CAKeyframeAnimation

	CAKeyframeAnimation *ka = [CAKeyframeAnimation animationWithKeyPath:@"transform"];
	ka.duration = .49;

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)

steipete

// 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>

zwaldowski

extern uint32_t dyld_get_program_sdk_version() WEAK_IMPORT_ATTRIBUTE;

extern BOOL DZApplicationUsesLegacyUI(void)
{
  static dispatch_once_t onceToken;
	static BOOL legacyUI = NO;
	dispatch_once(&onceToken, ^{
		uint32_t sdk = __IPHONE_OS_VERSION_MIN_REQUIRED;
		if (dyld_get_program_sdk_version != NULL) {
			sdk = dyld_get_program_sdk_version();

chrismiles

""" File: reveal.py

Add to ~/.lldbinit:
    command script import ~/.lldb-scripts/reveal.py

Q: Want to automatically load the Reveal lib on launch while debugging from Xcode?
A: In Xcode:
    Add a Symbolic Breakpoint
    Symbol: "UIApplicationMain"
    Action: Debugger Command with value "reveal"

steipete

- (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];
}

calebd

extension Array {
    
    func first() -> Element? {
        if isEmpty {
            return nil
        }
        return self[0]
    }
    
    func last() -> Element? {

rgcottrell

// NOTE: @schwa figured this out, but I'm claiming some of the credit for asking the question.
// See https://gist.github.com/schwa/ecd5f8c154e60fcb0f58 for the original solution.

// Playground - noun: a place where people can play

import Foundation

// Implementation (repeat as needed for number of parameters).

func unwrap<T1, T2>(p1: T1?, p2: T2?) -> (T1, T2)? {

mikeash

#import <Foundation/Foundation.h>

NSDictionary *TestD(void) {
    return @{
        @"string" : @"abc",
        @"number" : @42,
        @"dictionary" : @{
            @"string" : @"abcdef",
            @"array" : @[ @"a", @2 ]
        },