My Dev Notes

Refactor a Mega View Controller - A Live Coding!

Andy Matuschak gave a good talk on refactoring a mega controller.

My First WWDC ↗

Swift Script to Download All WWDC 2016 Videos and PDFs Automatically

tldr: Check out wwdc-dl, the github project with the Swift scripts

Advanced Swift Scripting

This post covers more common tasks when writing Swift scripts, following the post on an introduction to Swift scripting.

Complete Guide to Implementing WKWebView

Using web view is not new. We had UIWebView for many years.

Resize UIImage in Swift

Erica Sadun posted a Swift rewrite challenge, and the chosen function is to scale and crop an image.

Finding Retain Cycle With Instruments

In the last post we have an introduction with using Instruments to finding memory leak.

Finding Memory Leak Using Instruments

Often, developers do not put much effort into finding memory leak. While technology like ARC and Swift has helped to prevent us from creating memory leak, it is still unavoidable.

Migrating From Wordpress to Jekyll

Recently I migrated blog.just2us.com from a self hosted wordpress to Jekyll on Github Pages.

Migrating From Blogger to Jekyll

I had a Blogger site that was recently migrated to the fabulous Jekyll (which this website is running on too!).

NSAttributedString, HTML and Unicode Encoding

While converting a HTML string to a NSAttributedString, I discovered a perculiar thing about it’s unicode encoding format.

Introduction to Scripting in Swift

Getting Started

Docker Error: Returned a Non-zero Code: 137

While running a node app with Docker, there is an error 137:

Auto Adjust UITableViewCell Height

If you use auto layout and support iOS 8, then you are in luck.

Dynamic Type to Adjust Text Sizes & Fonts Automatically

iOS 7 introduces Dynamic Type, a way for users to change their preferred text size from iPhone/iPad global Settings.

Integrating Static Library With Cocoapods Use_frameworks

When using a library that is built with static framework (vs dynamic) and integrating using Cocoapods, you could have linker error when you use use_frameworks! and Swift.

Making Tab Bar Slide When Selected

This is a Swift code snippet for making the tab bar have a sliding animation when selected.

Pitfall: Handling Core Data NSManagedObjectContext in Threads

It is very common to have Core Data crashing, especially if you are using multiple contexts in multi-threaded environment.

Tutorial on Creating App Shortcut With 3D Touch

UPDATED for Swift 4.2. And for UIScene, refer to this.

Pitfall: Core Graphics Drawing Blurry Lines

There is a common pitfall with using Core Graphics API to draw.

Using Custom UICollectionViewCell Xib in Storyboard

There are many methods to creating your user interface - storyboard, xib, pure code, with custom cell, using view tags..

About App Link (branch.io)

App Link is, technically, not a link, but metadata (eg. og:title and og:url) on a webpage.

The bug with UICollectionView Content Offset

I have covered a few posts on using UICollectionView.

How to Handle Button/views Interaction in a UITableViewCell

We all know a cell is tapped wehn UITableViewDelegate method - tableView:didSelectRowAtIndexPath: - is called.

Everything About ErrorType - the Thing That Swift Throw

ErrorType is a big thing is Swift, changing the way how errors are handled.

Using UIPageViewController With Custom UIPageControl

I have previously provided 2 posts about UIPageViewController, but that’s not enough.

How to Create Multiple Tappable Links in a UILabel

A good example is a UILabel that looks like the following below the Facebook button.

Everything About UIActivityViewController

UIActivityViewController was introduced in iOS 6 for apps to handle data (text, url, image, etc) in another app.

Everything About Xcode UI Testing

A previous post on using fastlane’s snapshot for automating screenshots capture provided some good tips.

Pitfall With UI Testing Record Button Disabled

I encountered a weird situation whereby the record button (at the bottom left of Xcode), is disabled.