With each new version of iOS, Apple introduces new SwiftUI features to add new features and plug holes in the framework. This article provides a solution for using new view modifiers that ship with new iOS versions--without raising the app's minimum iOS target setting. What are View Modifiers If you've used SwiftUI …

Read More

SwiftUI Preview is a fantastic piece of development tooling to quickly iterate UI designs in Xcode. But sometimes the code in your view just doesn't work--or worse it crashes the preview engine. How can we work around this issue? I ran into a Preview crash issue in a SwiftUI view containing a Sign in with Apple button. …

Read More

This post is part one of a series targeted at helping mobile app developers build their own BLE Peripherals using inexpensive ESP32 hardware in less than 100 lines of code. This can help to more fully understand the BLE protocol. If you’re an iOS developer who would like to build their own BLE Peripherals for learning …

Read More

This post is part two of a series targeted at helping mobile app developers build their own BLE Peripherals using inexpensive ESP32 hardware in less than 100 lines of code. This can help to more fully understand the BLE protocol. If you’re an iOS developer who would like to build their own BLE Peripherals for learning …

Read More

Many mobile applications incorporate remote web pages, either as passive (static) content — or as in this case as integral parts of the UI. Using the WebKit/WKWebView techniques presented here, your native apps can be better integrated with web content and provide a superior experience to end-users. Two-way Integration …

Read More

Each section below provides a snippet of code that configures a particular DatePicker, followed by the UI component created by iOS and macOS output for the specific component configuration. -- Some SwiftUI styles are not available on both iOS and macOS. For example the Wheel style is iOS only; the Stepper style is …

Read More

In this post, I'll build a simple bar chart in code, and add it to a the default UIViewController created by an Xcode template project. The techniques you'll learn in this article are: Creating a UIView entirely in code Adding Auto Layout constraints to views in the hierarchy using code Calculating view sizes and …

Read More

This technique is demonstrated within the context of a SwiftUI application, but the real topic of discussion is the NetworkClient singleton used by the SwiftUI app. There's really no difference between how this technique applies for UIKit or AppKit, so it should still be relevant. App Architecture The overall app for …

Read More

This technique demonstrates the simple but useful task of capturing the contents of a UIView as a JPEG image data object. The resulting Data object can be written to a .jpg file, uploaded to a web service, or sent as an e-mail attachment (as is covered in this related post). Application This technique is relatively …

Read More

Sending content from an iOS application to external sources like email is a common requirement. This quick post summarizes the steps to implement this feature. Aa an added twist, the project used for this technique post includes capturing an image from one of the app's UIViews. Below is a video demo of the application …

Read More