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一、Key features
1.Xcode previews
You can use Xcode previews directly with UIKit, include UIViewController and UIView.
2. View Controller lifecycle
Add a new method: UIViewController.viewIsAppearing(_:)
Called between viewWillAppear(_:) and viewDidAppear(_:)
Best place to update ui when view appears
Back-deploys to iOS 13
3.Trait system enhancements
- Define custom traits to UITraitCollection
- Easily change trait values in hierarchy
- Flexible APIs to receive callback when traits change value
- UIKit and SwiftUI interoperability
Session: Unleash the UIKit trait system
4.Animated symbol images
Session: Animated symbol in your app
5.Empty status
二、Internationalization
三、Improvement for iPad
四、General enhancements
Text interactions: “What’s new with text and text interactions”
The default statusbar style can adjust the content of the app and automatically changes between dark and light styles.
