SwiftUI’s New App Lifecycle and Replacements for AppDelegate and SceneDelegate in iOS 14 With iOS 14, it is now possible to build entire apps using only SwiftUI, avoiding the need to implement UIKit lifecycle protocols such as UIApplicationDelegate. This is made possible due to the introduction of new SwiftUI features such as the App protocol and SceneBuilder function builder. Here, Anupam Chugh shows us how we can leverage these new SwiftUI features to implement a SwiftUI app lifecycle. Posted on July 14, 2020 #swiftui #ios14 #wwdc20 #lifecycle
A first look at matchedGeometryEffect SwiftUI provides great support for animation, allowing us to animate changes to views, or to a view's state. In the latest version of SwiftUI, included in the iOS 14 beta, we get a new method, matchedGeometryEffect, which defines a group of views with synchronized geometry. Combining this method with SwiftUI's support for animations allows us to animate a change in the position and size of two or more views in our view hierarchy. In this post, Sarun shows us how it's done. Posted on July 12, 2020 #swiftui #ios14 #wwdc20
The difference between @StateObject, @EnvironmentObject, and @ObservedObject in SwiftUI SwiftUI implements it's data flow management types, such as State, Binding, and ObservedObject, as property wrappers. In this post, Majid explains the difference between some of these property wrappers, including the new StateObject property wrapper which is available in iOS 14 Posted on July 12, 2020 #swiftui #state #ios14
Adding optional @Bindings to SwiftUI views SwiftUI gained a number of new view types at WWDC this year, one of them being DisclosureGroup. DisclosureGroup acts like an expandable cell, showing or hiding it's content based on it's disclosure state. One interesting aspect of this view is that it provides a number of initializers, some of which require an isExpanded binding, some of which don't. In other words, this isExpanded binding is optionally passed in when the view is initialized. In this post, Federico Zanetello shows us how we can add optional bindings to SwiftUI views, by creating his own version of the DisclosureGroup view. Posted on July 11, 2020 #swiftui #wwdc20
New property wrappers in SwiftUI SwiftUI allows us to declaratively build our user interfaces, while also indicating data dependencies for our views. We indicate these dependencies using data management types, which are implemented in SwiftUI as property wrappers such as State and Binding. With iOS 14, SwiftUI introduces additional property wrappers to help us manage state and data flow, and in this post, Majid shows us how we can use them. Posted on July 6, 2020 #swiftui #ios14 #wwdc20
How SwiftUI can now be used to build entire iOS apps At this year's WWDC20, SwiftUI received some very impressive updates. One of them is the ability to create an entry point for an app without needing to rely on UIKit/AppKit. What this means is that we can now build an entire app using SwiftUI. In this post, John Sundell shows us how simple it is to build such an app. Posted on July 5, 2020 #swiftui #ios14 #xcode12 #wwdc20
Use PinnedScrollableViews to make sticky headers In this short post from Yo! Swift, we learn how to use the new SwiftUI PinnedScrollableViews type to implement sticky headers in a scrollable view. Posted on July 5, 2020 #swiftui #wwdc20
Add custom SwiftUI view to View Library with LibraryContentProvider Xcode's library allows us to quickly access commonly used SwiftUI system elements such as views and modifiers. New to iOS 14 and Xcode 12 is the ability to add our own custom SwiftUI views to the library. This post from Sarun shows us how to do it. Posted on July 4, 2020 #ios14 #xcode12 #swiftui
Enabling high-performance Metal rendering with drawingGroup() As many iOS devices now render at 120 frames per second, it's important we consider performance when rendering complex content. In this post from Paul Hudson, we learn how to use the drawingGroup view modifier to improve rendering when using SwiftUI. Posted on July 3, 2020 #swiftui #performance
SwiftUI: Two equal width columns SwiftUI provides built-in view modifiers which we can apply to views to produce a different version of the original view. One such modifier is frame(width:height:alignment:), which when applied to a view positions it within an invisible frame with the specified size. In this post, Noah Gilmore shows us how we can use the frame modifier to create a view consisting of two equal width columns. Posted on July 2, 2020 #swiftui