100 days of swiftUI

Day 30: park 5, part 2
Use list to add possible user input words, and use uiTextChecker to validate user input is a valid word.

Day 31: word scramble wrap up
Guard let
Bundle
List: two views in a list create an implicit Hstack/label? / id for each view
On appear() view life cycle
NSNotFound
Fatal error

Day 32: animation
Animation modifier(implicit animation)
Animation binding:eg: stepper increase/decrease value also changes animation
explicit animation: e.g. rotation3Deffect/with animation closure

Day 33, project 6 part 2
Animation stack/ view transitions/ custome transition view modifier

Day 34: animation review and challenge (not able to finish challenge 2: make non selected bottom opaque 25%)

Day 35: summarize project 4-6
Key points:
  flat app bundles: loose app files will be put to resource folder during app build time this-> file name needs to be unique across project
Swift does not support String[idx] = character and you should know exactly why
Foreach use Range<Int> but 0…5 is Closed Range type thus not able to pass in Foreach.
Foreach init()
Public init(_ data: Range<Int>, @ViewBuilder content: @escaping (Int)-> Content)

Day 35 challenge: create a game to select number of questions and reset game

Day 36: project 7 part 1
3 steps for @observedObject to use class across views/ environment bonding/ user default/ codable

Day 37: project 7 part 2

ObservableObject protocol and use of @published/@ObservedObject(similar to @State)
Codable protocol: use UserDefault to save encoded data and when app launch, load data/decode to object
@Environemnt(\.presentationMode) to dismiss sheet automatically

Day 38 moonshot
Resize image, with geometry reader
Scroll view not lazy; list is lazy
Navigation link/ codable

补充内容 (2021-10-13 10:59 +08:00):
iExpense wrap up:
Challenge: edit/done navigation bar item
Validate amount is number
Add style for amount range