Xing He kukushi

## libdispatch-efficiency-tips.md

      
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                tclementdev
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                Making efficient use of the libdispatch (GCD)
              
          
    libdispatch efficiency tips

The libdispatch is one of the most misused API due to the way it was presented to us when it was introduced and for many years after that, and due to the confusing documentation and API. This page is a compilation of important things to know if you're going to use this library. Many references are available at the end of this document pointing to comments from Apple's very own libdispatch maintainer (Pierre Habouzit).
My take-aways are:


You should create very few, long-lived, well-defined queues. These queues should be seen as execution contexts in your program (gui, background work, ...) that benefit from executing in parallel. An important thing to note is that if these queues are all active at once, you will get as many threads running. In most apps, you probably do not need to create more than 3 or 4 queues.


Go serial first, and as you find performance bottle necks, measure why, and if concurrency helps, apply with care, always validating under system pressure. Reuse


## introrx.md

      
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                staltz
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                The introduction to Reactive Programming you've been missing
              
          
    The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.


## backendDevelopmentBookmarks.md

      
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                dypsilon
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                Backend Engineering Bookmarks
              
          
    Backend Development


node.js

Installation paths: use one of these techniques to install node and npm without having to sudo.
Node.js HOWTO: Install Node+NPM as user (not root) under Unix OSes
Felix's Node.js Guide
Creating a REST API using Node.js, Express, and MongoDB
Node Cellar Sample Application with Backbone.js, Twitter Bootstrap, Node.js, Express, and MongoDB
JavaScript Event Loop


Node.js for PHP programmers


## uiappearance-selector.md

      
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                mattt
                / uiappearance-selector.md
            
            
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              March 19, 2024 12:52
            
              
                A list of methods and properties conforming to `UIAppearance` as of iOS 12 Beta 3
              
          
    Generate the list yourself:
$ cd /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS*.sdk/System/Library/Frameworks/UIKit.framework/Headers
$ grep UI_APPEARANCE_SELECTOR ./*     | \
  sed 's/NS_AVAILABLE_IOS(.*)//g'     | \
  sed 's/NS_DEPRECATED_IOS(.*)//g'    | \
  sed 's/API_AVAILABLE(.*)//g'        | \
  sed 's/API_UNAVAILABLE(.*)//g'      | \
 sed 's/UI_APPEARANCE_SELECTOR//g' | \


## Measure.swift
//  Created by Baye Wayly on 2020/3/13.
//  Copyright © 2020 Baye. All rights reserved.

import SwiftUI

struct Measure<Content: View>: View {
  @State var cost: TimeInterval = 0
  var content: Content

  init(@ViewBuilder builder: () -> Content) {

## PSPDFUIKitMainThreadGuard.m
// 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>

## RichTextEditor.html
<!DOCTYPE html>
<html>
    <head>
        <meta name="viewport" content="initial-scale=1.0" />
    </head>
    <body>
        <div id="editor" contenteditable="true"></div>
    </body>
</html>

## Macros.h
#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

## re-enable delete action.markdown

      
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                d-ronnqvist
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                How to break (and re-enable) the native accessibility "delete" action for table views
              
          
    If you've haven't seen it before, there is a cool accessibility feature in UITableView that allows the user to toggle between different actions. It's really very elegant and it's a powerful and convenient implementation for VoiceOver users on iOS. One could say that it's the VoiceOver version of the swipe-to-delete feature.
To try it out yourselves, open one of the built in apps like Mail or Notes and turn on VoiceOver. If you are afraid to accidentally delete some of your important notes or email, you can also create a new Master-Detail Application in Xcode and run it on your device. Navigate to one of the cells and use the "Rotor" (rotate with two fingers on the screen) to find the "Actions" item. Now you can swipe up and down do toggle between "Activate Item (default action)" and "Delete". If you now double tap, the cell gets deleted instead of selected.

This is the default behavior and you get this accessibility out of the box with UITableView.

  
## .gitignore
secrets/
	// Created by Baye Wayly on 2020/3/13.
	// Copyright © 2020 Baye. All rights reserved.

	import SwiftUI

	struct Measure<Content: View>: View {
	@State var cost: TimeInterval = 0
	var content: Content

	init(@ViewBuilder builder: () -> Content) {
	// 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>
	<!DOCTYPE html>
	<html>
	<head>
	<meta name="viewport" content="initial-scale=1.0" />
	</head>
	<body>
	<div id="editor" contenteditable="true"></div>
	</body>
	</html>
	#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