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. …

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SwiftUI uses declarative UI programming, where Views have immutable state, changing automatically as the data state they depend on changes. This is a mindset change for most iOS/macOS developers: instead of changing the UI with a “command and control” MVC mindset, data state changes indirectly change the UI. But how …

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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 …

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This post covers how to use the Grand Central Dispatch's DispatchGroup object to coordinate separate web requests so that UI updates can be completed at the same time, even when asynchronous requests aren't guaranteed to return in a predictable order. This post is primarily a tutorial of using GCD's DispatchGroup, and …

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