AsyncThrowingStream and AsyncStream are part of the concurrency framework introduced in Swift 5.5 due to SE-314. Async streams allow you to replace existing code that is based on closures or Combine publishers. Before diving into details around throwing streams, I recommend reading my article covering async-await if you didn’t do so yet. Most of the …
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Downloading and Caching images in SwiftUI
Downloading and caching images is an essential part of building apps in Swift. There are several ways of downloading images with 1st party APIs 3rd party libraries. In my experience, every developer has their way of handling remote images since there’s no go-to standard. SwiftUI introduced AsyncImage as a 1st party solution to displaying remote …
Using MetricKit to monitor user data like launch times
The MetricKit framework allows us to collect all kinds of data from our end users, including launch times and hang rates. MetricKit data can be explored by going into the Xcode organizer panel in which several metrics are listed. Several techniques exist to improve launch times, but it all starts with gaining insights into how …
Disable animations on a specific view in SwiftUI using transactions
Animations in SwiftUI look great and make your app shine, but sometimes you want to disable animations on a specific view since it doesn’t look great when animating. Compared to UIKit, SwiftUI makes it easier to create animated transitions between two states using the animation view modifier. You can see each animation as a transaction …
Error alert presenting in SwiftUI simplified
Presenting error alerts in apps is essential to communicate failures to your end-users. The happy flow of apps is often implemented well, but the unhappy flow is equally important. Managing all kinds of error alerts can be frustrating if you have to present them all individually. While building my apps, I’m constantly seeking generic solutions …
AnyObject, Any, and any: When to use which?
AnyObject and Any got a new option any as introduced in SE-355, making it harder for us developers to know the differences. Each option has its use cases and pitfalls regarding when not to use them. Any and AnyObject are special types in Swift, used for type erasure, and don’t have a direct relationship with …
How to use the #available attribute in Swift
Marking pieces of code as available or unavailable per platform or version is required in the ever-changing landscape of app development. When a new Swift version or platform version arrives, we’d like to adapt to it as soon as possible. Without throwing away support for older versions we can make use of the available attribute …
@Published risks and usage explained with code examples
@Published is one of the property wrappers in SwiftUI that allows us to trigger a view redraw whenever changes occur. You can use the wrapper combined with the ObservableObject protocol, but you can also use it within regular classes. It’s essential to understand how the published property wrapper works since it can easily lead to …
@StateObject vs. @ObservedObject: The differences explained
The @StateObject and @ObservedObject property wrappers tell a SwiftUI view to update in response to changes from an observed object. Both wrappers look similar but have an essential distinction to be aware of when building apps in SwiftUI. At first, you might wonder why you wouldn’t just always use @ObservedObject. I thought the same for …
How to use the Redacted View Modifier in SwiftUI with useful extensions
The redacted view modifier in SwiftUI allows us to create a so-called skeleton view while our data is loading. Using a skeleton view instead of a spinner lets the user get a sense of how our views will look once the data is loaded. The user experience is smoother and gives the feeling of faster …