In a macOS or iOS app, you can easily add a zoom feature to any SwiftUI view with the scaleEffect modifier. In the below example, I am using a Slider to control the zoom level. Here’s how you can implement zooming in and out with a slider:
To add a character length limit to a TextField in SwiftUI, you can use a combination of Swift’s .onChange, .onPasteCommand modifier, and string manipulation to limit the number of characters the user can enter.
To create a squircle shape (a combination of a square and a circle, also known as a superellipse) in SwiftUI, you can define a custom shape by conforming to the Shape protocol and implementing the superellipse formula. The formula for a superellipse is:
In SwiftUI, looping through an enum is not directly possible without some extra work because enums in Swift don’t inherently support iteration. However, you can achieve this by making the enum CaseIterable, which automatically provides a collection of all cases in the enum.
You can apply mirroring to a SwiftUI view by using the scaleEffect(x:y:anchor:) modifier to flip the view horizontally or vertically. Specifically, you can set the x or y scale to -1.0 to mirror the view along that axis.
To run some code before app termination in a macOS app using SwiftUI, the correct approach would involve placing the termination logic within a view, such as the ContentView. Here’s how you can do it:
SwiftUI provides an openWindow environment variable on macOS that allows you to open windows programmatically. Here’s how you can use it to open a new window when a button is clicked:
To open or close a window programmatically from outside that window using environment variables, you need to leverage the new openWindow (macOS 13+) and dismissWindow (macOS 14+) environment variables. This environment variables allow you to programmatically open and close a window by its identifier.
Combine is Apple’s declarative framework for handling asynchronous events and data streams in Swift. Introduced in SwiftUI and iOS 13, Combine leverages reactive programming principles, allowing developers to process values over time and manage complex asynchronous workflows with clarity and efficiency.
In SwiftUI, both @StateObject and @ObservedObject are property wrappers used to manage state in your views, specifically when working with objects that conform to the ObservableObject protocol. However, they serve slightly different purposes and have different use cases. Here’s a breakdown:
In SwiftUI, the @Published property wrapper is used in combination with the ObservableObject protocol to automatically announce changes to properties of a class. This allows SwiftUI views that depend on these properties to update automatically when the data changes.
In SwiftUI, you can open another view (or navigate to another view) on the click of a button by utilizing navigation views and navigation links. Here’s a basic example of how to achieve this:
In SwiftUI, you can force an app to open in landscape mode by configuring the supported interface orientations in your app’s target settings. Here’s a step-by-step guide to configuring interface orientations in Xcode:
In SwiftUI, you can declare an array of View using the standard Swift array syntax. Here’s how you can do it:
In SwiftUI, you can create custom view modifiers to encapsulate common styling configurations and reuse them across different views. Here’s how you can create and reuse a custom view modifier:
Let’s say you have a view named ContentView and your main App file looks like this:
The below should work both on macOS and iOS with one minor change. That is, use UIColor instead of NSColor if you’re planning to use it for iOS.
To display both the app version and build number in a SwiftUI macOS/iOS app, you can use the Bundle class to access information from the app’s Info.plist file. The Info.plist file contains various details about your application, including its version and build number. Here’s how you can do it:
```swiftimport SwiftUI
In macOS 14.0 (Sonoma), Apple removed support for NSApp.sendAction to open the Settings view in your SwiftUI app. You now have to use SettingsLink like below:
Setting your app’s icon on the menu bar as a template makes it to adapt to light and dark modes automatically without you doing anything. To do this, you have to use this constructor of MenuBarExtra class.
Although many things in SwiftUI are idiomatic and straightforward, showing your view in a new window needs a bit of coding to do. Hence, this short post.
