alex kent alexkent

Analysis of Apple’s rubber band scrolling

January 6, 2013

I recently saw a post on Twitter from @chpwn that described the alogorithm that Apple uses for its “rubber band” or “bungee” scrolling.

b = (1.0 – (1.0 / ((x * c / d) + 1.0))) * d

	//
	// UIView+RSKeyboardLayoutGuide.swift
	// RSTouchUIKit
	//
	// Created by Daniel Jalkut on 12/23/18.
	//

	import UIKit

	// Extends UIView to expose a keyboardLayoutGuide property that can be used to tie a view controller's content

	//
	// AppDelegate.m
	// NanoCompanion
	//
	// Created by Steven Troughton-Smith on 13/01/2015.
	// Copyright (c) 2015 High Caffeine Content. All rights reserved.
	//

	#import "AppDelegate.h"

	/**
	Provides the ability to verify key paths at compile time.

	If "keyPath" does not exist, a compile-time error will be generated.

	Example:
	// Verifies "isFinished" exists on "operation".
	NSString *key = SQKeyPath(operation, isFinished);

	// Verifies "isFinished" exists on self.

	TAGS="TODO:\|FIXME:\|\/\/TODO"
	find "${SRCROOT}" \( -name ".h" -or -name ".m" -or -name ".swift" \) -print0 \| xargs -0 egrep --with-filename --line-number --only-matching "($TAGS).\$" \| perl -p -e "s/($TAGS)/ warning: \$1/"