Hands On with Adaptive Layout

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Hands On with Adaptive Layout github.com/sammyd/ HandsOnAdaptiveLayout

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hi, i’m sam @iwantmyrealname

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shinobicontrols.com/ ios8cocoa

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shinobicontrols

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shinobicontrols

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in the beginning

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in the beginning

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in the beginning

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in the beginning

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in the beginning

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in the beginning

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in the beginning 2 2 2 2 2 = 10 + + + +

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in the past

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in the past if UIDevice.currentDevice().userInterfaceIdiom == .Pad { if UIDevice.currentDevice().orientation == .LandscapeLeft || UIDevice.currentDevice().orientation == .LandscapeRight { doSomething() } else { doSomethingElse() } } else { if UIDevice.currentDevice().orientation == .LandscapeLeft || UIDevice.currentDevice().orientation == .LandscapeRight { yetAnotherAlternative() } else { theFourthWay() } }

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this doesn’t scale

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adaptive layout introducing….

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adaptive layout • Abstracts layout away from device speciﬁcs • Introduces size classes • Available in iOS 8 • Fully supported in Xcode and IB

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today • Intro to Size Classes • Demo of installable constraints & views in IB • Adaptive fonts and images • Adaptive Layout in code

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“amount of space available for content”

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size classes HORIZONTAL VERTICAL

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size classes HORIZONTAL VERTICAL compact regular

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size classes Horizontal Vertical iPad Portrait Regular Regular iPad Landscape Regular Regular iPhone Portrait Compact Regular iPhone Landscape Compact Compact iPhone 6 Plus Landscape Regular Compact

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approach 1. Build base layout 2. Choose size class override 3. Uninstall irrelevant constraints 4. Add new constraints speciﬁc to size class 5. Rinse and repeat

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demo

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installable constraints

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installable constraints

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installable views

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adaptive fonts

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adaptive imagery

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code

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UIUserInterfaceSizeClass enum UIUserInterfaceSizeClass : Int { case Unspecified case Compact case Regular }

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UITraitCollection class UITraitCollection : NSObject,... { var userInterfaceIdiom: UIUserInterfaceIdiom { get } var displayScale: CGFloat { get } var horizontalSizeClass: UIUserInterfaceSizeClass { get } var verticalSizeClass: UIUserInterfaceSizeClass { get } ... }

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UITraitEnvironment /*! Trait environments expose a trait collection that describes their environment. */ protocol UITraitEnvironment : NSObjectProtocol { var traitCollection: UITraitCollection { get } ... }

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handling change protocol UITraitEnvironment : NSObjectProtocol { ... /*! To be overridden as needed to provide custom behavior when the environment's traits change. */ func traitCollectionDidChange( previousTraitCollection: UITraitCollection?) } UIScreen UIWindow UIPresentationController UIView UIViewController

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handling change protocol UIContentContainer : NSObjectProtocol { func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) func willTransitionToTraitCollection(newCollection: UITraitCollection, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) } UIScreen UIWindow UIPresentationController UIView UIViewController

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overriding func setOverrideTraitCollection(collection: UITraitCollection?, forChildViewController childViewController: UIViewController) func overrideTraitCollectionForChildViewController( childViewController: UIViewController) -> UITraitCollection! UIScreen UIWindow UIPresentationController UIView UIViewController

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where next?

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where next? • Adaptive View Controller Hierarchies • Adaptive Presentation • WWDC Videos • Ray Wenderlich blog posts / book

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takeaways • Universal storyboards FTW • Can go far without code • Size classes conceptually equivalent to subclassing