cs193p

Lecture 13: Publisher More Persistence

• publishers
• more persistence
  • cloudKit
  • coredata

0:39 Publisher

• what is publisher?
• what can we do with a Publisher?
• listening (subscribing) to a Publisher
  • .sink
  • .onReceive
• where do Publisher come from?
  • URLSession
  • Timer
  • NotificationCenter

11:54 Code

class Document: ObserableObject {
    @Published var backgroundImage: UIImage?
}

var document = Document() 
document.$backgoundImage  <--- 取得 Publisher 實體

// 而以下如此是做 Bind
$document.background

35:28 More Persistence

cloudKit
API 使用

47:26 CoreData
API 使用

@ObservedObject
@FetchRequest

Lecture 14: Document Architecture

• App and Scene
• Document Architecture
• Components of a "document-oriented" app

App Architecture

• App protocol
• Scene protocol
  • WindowGroup { }
  • DocumentGroup(newDocument:) { }
  • DocumentGroup(viewing:) { }
• @SenceStorage
• @AppStorage
• @ScaledMetric

7:48 Code

app icon -> Asset.xcassets

19:56 RawRepresentable

每次開啟 app 後 load backgroundImage 完成又去 zoomToFit

28:02 Document Architecture

FileDocument
ReferenceFileDocument
UTType
Document Types
39:05 Undo

func undoablyPerform(operation: String, with undoManager: UndoManager?) {
    let oldModel = model
    doIt()
    undoManager?.registerUndo(withTarget: self) { mySelf in
        mySelf.model = oldModel
    }
    undoManager?.setActionName(operation)
}

43:14 Back To Code

• 49:50 讓 ViewModel conform to ReferenceFileDocument
• 1:02:16 undo imple
• 1:12:01 support document

cocoaError(.fileReadCorrup)