WWDC19 #

Modernizing Your UI for iOS 13 - Wednesday

Session materials: https://developer.apple.com/videos/play/wwdc2019/224/ A sample project with complex options will be available here.

Effective from April 2020

• Launch images are dropped completely, launch storyboards are the only way to go
• iOS 13 will always stretch apps to the fullscreen of the current device, no more empty bars at the top and the bottom
• Support split screen multitasking

New Bar Appearance

• Free when you link against iOS13 ``` let appearance = UINavigationBarAppearance()

appearance.configureWithOpaqueBackground()

appearance.titleTextAttributes = [] appearance.largeTitleTextAttributes = []

navigationBar.standardAppearance = appearance

// Navigation bar appearances .standardAppearance, .compactAppearance, .scrollEdgeAppearance

// button appearances .buttonAppearance, .doneButtonAppearance

`UIToolbarAppearance` & `UITabBarAppearance`

- Similar things applies to individual navigation Items for a specific navigation bar appearance for a single view in the hierarchy
`navigationBar.standardAppearance().copy`

## New Presentation Styles
- They stack on top of each other like a deck
- Dynamic readable width for the presented sheet

- `UIModalPresentationStyle.automatic` -> Resolving to different styles based on the parent view that are presenting
- `UIModalPresentationStyle.pageSheet` -> Automatic resolves to this one for custom view controllers
- `UIModalPresentationStyle.formSheet`
- `.fullScreen` if this is desired intentionally
- `.popover` to get the built in popover style

- Pull to dismiss in sheets are supported out of the box

// UIAdaptivePresentationControllerDelegate

func draftDidChange() {} func presentationControllerDidAttemptToDismiss(_:) { // Ideally present an action sheet here to warn the user } func shouldDismiss() {} func willDismiss() {} func didDismiss() {} ```

Share Extensions

• These will automatically become sheets

• Use sheets
• Implement the modal flow

Search

• UISearchController scope and search button are finally can be hidden!!!
• UISearchTextField is finally a normal UITextField which can be easily customized!!!
• searchController.showSearchResultController let’s to show/hide results in the built in controller

Search Tokens

• Available on any UISearchTextField
• Copy & Paste
• Drag & drop these tokens
• Always precedes text
• Can be selected and deleted
• Mixed selections are allowed

Creating Tokens

• UISearchToken()
• field.replaceTextualPortion -> with the token

Ranges and Positions

• .textualRange only gives the range of a piece of text without a token preceding

Gestures

Selection Gestures in Custom Text Views

• UITextInteraction -> allows adding native text editing actions to a custom textView as long as UITextInput protocol is conformed

  • Three lines of code
  • Editable and non-editable text interactions
  • Use UITextInput protocol to control selection UI

Multiple Selection Gestures in Tables and Collections

• Quickly select batch items in collection and tableViews
  • Two finger and slide down will put the view to the edit mode and pan across the area to select the cells!
  • Hold shift or cmd key on a hardware keyboard will do the same on these views
  • “Select” turns into “Cancel” or “Done”
  • Show action buttons after multiple selection is triggered

    Editing Gestures