100 days of swiftUI

Day 79: use environment object and tabview

Day 80:
@Published == willSet{ objectWillChange.send()}
Use Result for task to achieve flexibility for cancel long request/handle error,etc
Disable image interpolation by set it to .none

Day 81:
How to create context menu
How to add Custom swipe action on a row of list
How to schedule local notifications
How to add 3rd party package using swift package manager

Day 82:
Building tab bar with prospect objects (class, with @environmentObject, which only works for class).
EnvironmentObject never this accessible for all children view, so add the modifier  to parent view(tabview instead of each tabitem) if the environmentObject didn’t exist when view is created, the app crashes

Use map/filter at compute property hog a view

Day 83:
Fileprivate(set) modifier: write access only allowed at current fileThe reason we put prospect and prospects at the same file
Use objectWillchange to trigger SwiftUI update
Use code scanner to Scan qr code
Generate QR code from string -> data and covert to cgi image -> ui image

Day 84:
Save data to user default
Be aware not to dynamically regenerate image/QR code in view body-> cause endless loop for view to be regenerated the trigger update image call again-> then view regenerated… Xcode compiled show purple warning

Day 85: wrap up and challenge
Use on change/on appear to trigger view reload or objectWillChange for environment variable
Confirm dialog need to modify button not tab bar item/tab bar item group
Better use compute property

Day 86:
gestures/allowHitstesting/contentShape to define tappable area
Vibration with UInotificationFeedbackGenerator or core haptics

Day 87:
Use timer to trigger events(by Combine)
Environment variable scenePhase for app life cycle: active,inactive, background
Accessibility use cases: accessibility by differentiate without color
Accessibility reduce motion
Accessibility reduce transparency

Day 88:
Use offset/shadow to design a stack of cards
Order of modifier matters when dealing with rotation and offset
Additional buffer for Opaque to start taking effect (2 -xxx instead of 1)
How cardView set a callBack method for content view to call remove of cards-> child views should not call remove index at parent view and instead pass a closure by parents and execute it