Duy Bao Nguyen bduyng
bduyng
/ book-animation.tsx
Created
November 17, 2025 15:31
# 3D Book Flip Animation — Conceptual Explanation This gist describes the animation logic behind a lightweight **3D book-flip effect** created using **Expo + React Native Reanimated**. Although everything is made of flat 2D views, the animation produces a convincing 3D illusion by rotating pages around a simulated **inner spine cylinder**.
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| import Slider from '@react-native-community/slider'; | |
| import type React from 'react'; | |
| import { useEffect } from 'react'; | |
| import { Dimensions, type StyleProp, Text, View, type ViewStyle } from 'react-native'; | |
| import 'react-native-reanimated'; | |
| import Animated, { | |
| Extrapolation, | |
| interpolate, | |
| type SharedValue, | |
| useAnimatedStyle, |
bduyng
/ String+fromNow.swift
Created
March 16, 2016 09:58
Extension of String to convert timestamp string into "from now" version
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| extension String { | |
| func fromNow() -> String { | |
| guard Double(self) != nil else { | |
| return "Invalid Date" | |
| } | |
| let from = NSDate(timeIntervalSince1970: Double(self)!) | |
| let now = NSDate() | |
| let cal = NSCalendar.currentCalendar() |
bduyng
/ UIColor+Hex.swift
Last active
March 16, 2016 09:54
Extension of UIColor that support HEX color which also included alpha value
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| extension UIColor { | |
| class func hex(string: String) -> UIColor { | |
| var hex = string.hasPrefix("#") | |
| ? String(string.characters.dropFirst()) | |
| : string | |
| guard hex.characters.count == 3 || hex.characters.count == 6 || hex.characters.count == 8 | |
| else { return UIColor.whiteColor().colorWithAlphaComponent(0.0) } | |
| if hex.characters.count == 3 { |