How to use a different Swift toolchain in Xcode
Xcode comes bundled with a version of Swift. You can refer to this list for the shipped versions. Sometimes, you won’t want to upgrade Swift for your project. So if you update X...
My Dev Notes
Figuring out software, one rabbit hole at a time.
Archive
Page 4 of 19How to code sign on CI along with Xcode auto sign
Since a few years ago, Xcode has added an awesome feature. Automatically manage signing is a simple checkbox that will make life so much happier for all Apple developers. No lon...
Run swiftlint in pre-commit hook
If you ever run swfitlint in a CI/CD pipeline, you might have experienced errors merely due to linting. You have to fix it, push it, then wait for another few minutes (or hours)...
How to create a GitHub Action to upload dsyms
GitHub Actions are jobs that can be run on GitHub machines, which is usually used for CI/CD. But you can also conveniently add manual workflows with custom inputs, then click to...
Managing multiple github SSH keys on mac
If you have a personal account and a work account, then it gets more tedious to use both on the same computer. Here is a step-by-step guide on how to set them up.
How to communicate between SwiftUI and UIKit?
It is best to stick to either one framework, and not mix. But if you do need to.. here is how you can communicate between the 2 frameworks, bi-directionally.
When should you raise your iOS Deployment Target/minimum version?
Developers are most excited to kill off support for older platform, while business people are not. So how do you decide?
Swift 5.6 warning on self
One of the common UIKit pattern is to initialize and configure controls in this way:
Getting started with Solana development
Install Rust
Guide to in-app purchase testing (sandbox & production)
There are many details when it comes to testing IAP. This is a quick reference guide.
PITFALL: App Tracking Transparency prompt not showing
An App Store reviewer rejected my app update because the ATT prompt is not showing up (it did work in the last update).
Migrating Octopress to Jekyll with Github Pages
Octopress is dead and it no longer update. While it has been nice, we can live without, or replace it.
How to Add Data to HealthKit
This is a basic guide to HealthKit, covering how an app can insert data to Health app via the framework.
Warning if You Use HealthKit, Another App Review Rejection
I am not surprised with rejections. This time, the app reviewer has issue with my app using HealthKit.
Shortcut to Dismiss Mac Notification
Sorry, there is no keyboard shortcut that works (at least on Monterey beta).
URLSession with new async/await
With Swift 5.5 new concurrency syntax, many frameworks have been updated. This post cover the basic URLSession operations.
Structured Concurrency in Swift 5.5
This is yet another way to do concurrency, this time in Swift 5.5 with much cleaner code. First introduced in WWDC 2021, but it won’t be the last we see of it.
Use SMB (and Disable AFP) to Connect your Mac to NAS
I have been using my Synology NAS for a while, but the NAS recycle bin is always empty.
Using ffmpeg on M1 Mac
Using ffmpeg on M1 Mac is slow, hot, and the fan will kick in.
Load Web Fonts Asynchronously (for Webpages)
In Google PageSpeed, one of the “opportunity” to making webpages to load faster is to load web fonts asynchronously.
Unexpected Mach-O Header Code: 0x72613c21 ERROR
I encountered this error when uploading a binary using Xcode.
Troubleshooting an iPhone That Won't Turn On
I have an iPhone XS running iOS 14, and it suddenly switched off, and won’t turn on again.
Do NOT Implement Google UMP for iOS 14 IDFA
Google provided their User Messaging Platform (UMP) for showing a pre-permission prompt.
Improve UI Performance: Render Hitch
There are 3 new tech talks from Apple on improving UI performance: 10855, 10856 and 10857
My Technical Interview with TikTok iOS, Singapore
In this post, I will share my experience while interviewing for the position of iOS Software Engineer, Singapore. I will reveal the questions they ask. Hopefully it can help you!
Using xcconfig to Configure to Your Developer Account
When working on open source projects, the first thing you often have to do is to change the target’s signing to your own Team and Bundler Identifier.
youtube-dl Fights Back!
youtube-dl was taken down by DMCA a few months ago.
Exponential Power in Swift
Do you know how to represent exponential power in Swift?
Fundamentals of Swift Collections
While preparing for a technical coding interview, and practising LeetCode questions, I created this cheatsheet.
Bump Version Numbers
This is a tip originally from Ben Scheirman on using Fastlane to bump the major.minor.patch numbering.