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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: …