// 18 articles available
When two windows share iPhone Duo's inner display, neither one is told which side it's on. I built a proof of concept in Xcode 27.1 and found the fold's ReservedRegion answers it, once you know its frame is clipped to your window.
UIScreen.main assumes your app lives on one screen with one size. iPhone Duo, iPhone Mirroring, and iPad windowing all break that assumption. Here's what to use instead in UIKit and SwiftUI.
iPhone Duo reserves parts of its displays for the fold and the front cameras. Learn which regions exist, when system views handle them for you, and how to query ReservedRegion in SwiftUI and UIKit to move custom content out of the way.
ArrangementView is a new iOS 27.1 container that lays out a primary and secondary view side by side or layered, and rearranges them around the iPhone Duo fold. Here's how the split and overlay styles work, how to size them, and when not to use one.
iPhone Duo ships on October 23 with a folding inner display, a compact outer display, and toolbars that move to the side. Here's what to check in your app first, and where the new iOS 27.1 APIs fit in.
ViewThatFits picks the first child view that fits the available space. See how to build adaptive SwiftUI layouts with it, with examples and gotchas.
iOS 18 introduced public APIs for building custom container views that can decompose content into individual subviews. Learn how to use ForEach(subviews:), Group(subviews:), and ContainerValues.
The cornerRadius modifier is deprecated in iOS 17. Here's how to use clipShape, RoundedRectangle, and the new ConcentricRectangle to round corners the modern way.
Learn different ways to set background colors on SwiftUI views, from simple color fills to gradients and materials.
Resize images in SwiftUI using resizable(), frame(), scaledToFit, and scaledToFill. See clear examples and avoid the common aspect-ratio bugs.
Learn how to round only certain corners of a SwiftUI view using UnevenRoundedRectangle, custom shapes, and clipShape.
Understanding the difference between frame alignment and stack alignment is the key to centering views exactly where you want them in SwiftUI.
Safe areas keep your content visible and interactive. Here's how they work in SwiftUI and when you should ignore them.
Learn how to add horizontal padding inside a TextEditor without affecting the scrollbar using the contentMargins modifier introduced in iOS 17.
Learn how to use ToolbarSpacer to add fixed and flexible spacing between toolbar items in SwiftUI, new in iOS 26.
Learn how to create a Material Design-style floating action button in SwiftUI that intelligently moves above the keyboard and avoids blocking text input fields.
Learn how to align single and multiline text in SwiftUI.
Learn the ways to scale a text view's font size to fit its parent view in SwiftUI.