zhihuitang

import QuartzCore

public extension CGRect {
  public init(centre: CGPoint, size: CGSize) {
    self.init(origin: centre.applying(CGAffineTransform(translationX: size.width / -2, y: size.height / -2)), size: size)
  }
  
  public var centre: CGPoint {
    return CGPoint(x: midX, y: midY)
  }

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extension Optional where Wrapped: Collection {
    var isNilOrEmpty: Bool {
        return self?.isEmpty ?? true
    }
}

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/// Copyright (c) 2019 Razeware LLC
///
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
///
/// The above copyright notice and this permission notice shall be included in

zhihuitang

import UIKit
import CoreGraphics

extension UIView {
  func createRoundedRectPath(for rect: CGRect, radius: CGFloat) -> CGMutablePath {
    let path = CGMutablePath()
    
    let midTopPoint = CGPoint(x: rect.midX, y: rect.minY)
    path.move(to: midTopPoint)
    

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class Observable<Value> {
    private var value: Value
    private var observations = [UUID : (Value) -> Void]()

    init(value: Value) {
        self.value = value
    }

    func update(with value: Value) {
        self.value = value

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struct Identifier: Hashable {
    let string: String
}

extension Identifier: ExpressibleByStringLiteral {
    init(stringLiteral value: String) {
        string = value
    }
}

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Python3 Virtualenv Setup

Requirements

• Python 3
• Pip 3

$ brew install python3

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#!/bin/bash
set -o nounset
set -o errexit
set -o verbose
set -o xtrace

log() {
    local prefix="[$(date +%Y/%m/%d\ %H:%M:%S)]:"
    echo "${prefix} $@" >&2
}

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func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool
{   
    let timeline = TimelineViewController()
    let navigation = UINavigationController(rootViewController: timeline)

    let frame = UIScreen.main.bounds
    window = UIWindow(frame: frame)

    window!.rootViewController = navigation
    window!.makeKeyAndVisible()

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// https://www.vadimbulavin.com/advanced-guide-to-userdefaults-in-swift/
// what is the difference between WWDC2019 https://devstreaming-cdn.apple.com/videos/wwdc/2019/402fd460n3p3w5c/402/402_whats_new_in_swift.pdf
// The marker protocol
protocol PropertyListValue {}

extension Data: PropertyListValue {}
extension String: PropertyListValue {}
extension Date: PropertyListValue {}
extension Bool: PropertyListValue {}
extension Int: PropertyListValue {}