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wechat_spider 原理扫盲帖

这篇文章旨在为刚接触 wechat_spider 的人提供一个快速了解这个项目基本原理的途径。

思路

首先我们随便进入一个微信公众号详情页。

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iOS 绘图那些事

在 iOS 中，我们通过 Core Graphics (也叫 Quarz 2D) 来绘图，而在 Core Grapihcs 之上的 UIKit 又封装了如 UIBeizerPath 等高级 api，这里就来简单的谈谈基础和技巧。

draw(_:)

对于 UIView 来说，我们可以重写 draw(_:) 方法来进行绘图，官方文档中对它的描述是：

Specifically, UIKit creates and configures a graphics context for drawing and adjusts the transform of that context so that its origin matches the origin of your view’s bounds rectangle.

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const jsdom = require("jsdom");
const { JSDOM } = jsdom;
const fs = require("fs");

const files = [
  "202012.html",
  "202111.html",
  "202112.html",
  "202201.html",
  "202202.html",

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import GlobalSpinner from '@/components/GlobalSpinner'
import { contextFactory } from './helpers/contextFactory'
import { useToggleState } from '@/hooks/useToggleState'

type GlobalSpinnerContextProviderProps = {
  children: React.ReactNode
}

const GlobalSpinnerContextProvider = (
  props: GlobalSpinnerContextProviderProps

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import { createContext, useContext } from 'react'

export const contextFactory = <A extends unknown | null>() => { 
  const context = createContext<A | undefined>(undefined) 
  const useCtx = () => {
    const ctx = useContext(context) 
    if (ctx === undefined) {
      throw new Error('useContext must be used inside of a Provider with a value.') 
    }
    return ctx

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import { FunctionComponent } from "react";
import styled, { keyframes, css } from "styled-components";

const SkeletonLoader: FunctionComponent<{
  isLoading?: boolean;
}> = (props) => {
  return (
    <Content isLoading={props.isLoading}>
      {props.isLoading && <Loader />}
      {props.children}

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OC 运行时学习记录

debugger - lldb

Dancing in the Debugger — A Waltz with LLDB

Hopper + lldb for iOS Developers: A Gentle Introduction

---

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string interpolation

var a = 3;
print("$a 123");
print("${a+1} 123");

final const

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iOS Navigation Related Cheat Sheet

NavigationItem

每个 vc 都有自己的 navigationItem。

// 隐藏 push 的下一个 vc 的 back title。
navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .plain, target: nil, action: nil)

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// use after view has been layout

extension UIView
{
    // different inner shadow styles
    public enum innerShadowSide
    {
        case all, left, right, top, bottom, topAndLeft, topAndRight, bottomAndLeft, bottomAndRight, exceptLeft, exceptRight, exceptTop, exceptBottom
    }