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A browsable archive of writing and notes across the site.
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Building an elastic view animation with UIBezierPath
Original: Elastic view animation, or how I built DGElasticPullToRefresh Author: @gontovnik DGElasticPullToRefresh demonstrates a springy elastic effect. Here’s what it looks …
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A bit about Category in Objective-C
A category in Objective-C is a compile-time mechanism that lets you tack extra methods onto an existing class. There’s one catch: you can’t add new instance variables …
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Understanding the Objective-C runtime
The Objective-C runtime is one of those language features that’s easy to overlook when you’re just stepping into Cocoa/Objective-C land. The reason is simple: …
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How we built the Guillotine menu animation for iOS
Original: How We Created Guillotine Menu Animation for iOS Author: @johnsundell Ever wondered why nearly every app’s menu is a sidebar? Why isn’t it a topBar, a …
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[28] Implement strStr()
Problem: 28. Implement strStr() Implement strStr(). Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. What it’s asking …
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[257] Binary Tree Paths
Problem: 257. Binary Tree Paths Given a binary tree, return all root-to-leaf paths. For example, given the following binary tree: 1 / 2 3 5 All root-to-leaf paths are: …
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[018] Length Of Last Word
Problem Given a string s consists of upper/lower-case alphabets and empty space characters ’ ‘, return the length of last word in the string. If the last word does not …
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iOS remote push notifications: a deployment walkthrough
iOS push notification setup has been driving me crazy for the past few days, so I’m writing up everything I learned for anyone else who might run into the same wall. How iOS …
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Notes on singly linked lists
Cyclic singly linked lists — linked lists that contain a loop — come up in a lot of interview questions. This post is a roundup, partly for reference and partly to sort out my own …
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[151] Reverse Words in a String
Problem: Reverse Words in a String Given an input string s, reverse the string word by word. For example, given s = “the sky is blue”, return “blue is sky …