Swift Structured Concurrency
How to run in a non-main thread
My Dev Notes
Figuring out software, one rabbit hole at a time.
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Page 3 of 18AppDelegate template for a multiplatform SwiftUI app
This template is for multiplatform app supporting both iOS and macOS in the same target.
No more Info.plist & Launch Storyboard
If you create a new project in 2023, these 2 components are no longer a thing.
How to create table using UICollectionView
Since iOS 14, there are lots of “features” and changes to UICollectionView, making it possible to create a standard table/list UI. This WWDC 2020 session introduced the modern w...
StackOverflow traffic is declining
This is an insight into programmers’ favorite website, as I have unlocked the secret access. This post has screenshots of the analytic data, or you can also watch my vlog.
Xcode Header Template for Swift Packages
If you use Swift Package, there are 2 pesky problems whenever you create a new file.
Push Notification Guide
Enable Push Capability
Disconnect your app from unit testing
If you do run unit tests, here’s 1 useful tip to make your tests run faster, and more predictable.
The dumbest thing about imageLiteral
If you have used #imageLiteral you might understand how dumb an Xcode feature can be. It is most likely a half-baked idea. Won’t be surprise to see them deprecate it.
Should you squash merge in a pull request (PR)?
GitHub pull request (PR) provides 3 options for a PR merge. You can (1) regular merge, (2) squash merge, or (3) rebase.
How to resolve merge conflicts for long-lived branches
Long-lived branches require frequent merge from the master or main branch, and resolving conflicts repeatedly. Here are some tips on how to perform the merge.
Improve App Launch Time 2022 Edition
Improving app launch time is an evergreen topic, with Apple sharing tips since the first iOS SDK. Overtime, the techniques will change. I was looking at it again, after many yea...
Reducing Xcode debugger logs
If your debugger output is producing too many log messages, here are some ways you can reduce it.
Run Github Action when tag is pushed on a specific branch
It is common for a CI/CD pipeline to run a build on Github when a certain tag is pushed. For example, if I want to release v1.2 of an app, I can simply tag v1.2, push, and that ...
How to launch iPhone simulator with arguments
Sometimes you need to run an app on simulator without building in Xcode. It is especially useful for QA/Test engineers. While they usually has an arsenal of iPhones, there is 1 ...
Pitfall of Nested ObservableObject
I was naive to create a view model using a service that is also an ObservableObject. It looks like this:
Replacing if let in Swift 5.7
With the new Xcode 14, the biggest feature 😂 of Swift 5.7 has to be the enhancement of the unwrapping syntax. We can delete a lot of code with a simple find & replace.
AppStorage, and observing a Binding
@AppStorage is a property wrapper for UserDefaults, provided by SwiftUI framework. It is very simple to use, but in practice, some simple things are not obvious.
How to use Factory (DI) in SwiftUI
Factory is the Dependency Injection (DI) library which will replace it’s popular predecessor – Resolver.
How to use Combine
Most developers have experience using RxSwift. But since iOS 13, Apple has provided their 1st party framework, tightly integrated into other frameworks, including SwiftUI.
PITFALL: Beware of retain cycle when passing a func as a closure parameter
I fell into this trap and had a retain cycle.
How to inject a property
This is cool trick to inject a certain property for a type.
How to use URLProtocol to mock networking API
Unit testing for networking API requires some work because to mock the HTTP response is non-trivial, be it using 1st party URLSession or 3rd party Alamofire.
Asset Catalog and Dark Mode
If you’re supporting iOS 13 minimally, you should give Asset Catalog and the system dark mode another look. It was in iOS 13 (back in 2019!) that Apple added dark mode support. ...
A gitattributes template for Xcode projects
A gitattributes template for Xcode projects, specifying how files are to be diff and merged for pbxproj file format.
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...
How 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.
