Скачать или смотреть SwiftUI Catalyst Combine - Pexels Test

Testing:
Using Combine for both REST-API
and WebImage Fetch.
Initial Fetch, Popular (Page Ctrl active)
Search 1 Page max 99 items
Button Reset back to Initial Mode
TAB-key to refocus Input to PageGoto and SearchText
RightClick on Image to save Thumbnail or FullImage
(Downloads Folder)
RightClick on Text in a GridItem, goto Full Window Image
Tap on Full window to close it. (may need to wait for Touch Focus)

_____________
Released to Public Domain
https://1drv.ms/u/s!ApN1U-GH6AeIoBQLi...
___________
Resources:
MacOS 11.2.3
Xcode 12.4
app.quicktype.io (Classes)
Pexels.com API (key)
_______ For FullScreen UIView Representation ___________
1. Change FullScreenCover SwiftUI view to Repr

FullCover2M3PWebImage.init(primaryPath: $bPath)

2.
// The Representation
import SwiftUI
import UIKit

struct FullCover2M3PWebImage: UIViewRepresentable, RepresentationClosingProtocol
{
func closeMe() { presentationMode.wrappedValue.dismiss() } // RepresentationClosingProtocol

typealias UIViewType = UIViewFor2M3P

@Environment(\.presentationMode) var presentationMode
@Binding var primaryPath : String


func makeUIView(context: Context) -* UIViewType {
let view = UIViewFor2M3P()
view.repClosingDelegate = self
return view
}

func updateUIView(_ uiView: UIViewType, context: Context)
{
uiView.setImagePerRepresentationRequest(primaryPath: primaryPath )
}
}

// call the UIView's Method

func setImagePerRepresentationRequest(primaryPath: String)
{
guard self.primaryPath != primaryPath else { return }
self.primaryPath = primaryPath

webImageLoader.fetchImageHttps(str: self.primaryPath )

// see PT subs
}


3. Loader, added
// MARK:- C o m b i n e - L o a d e r

class WebImageDownloader: ObservableObject
{
private var urlString : String?
private var cancellable : Cancellable?
@Published var image : UIImage?

// Start UIVIEW
private var ptSubject = PassthroughSubject*UIImage,Never*()
var uiiPublisher: AnyPublisher*UIImage, Never*
{
ptSubject.eraseToAnyPublisher()
}
// end UIView



func fetchImageHttps(str:String)
{
let url = URL.init(string: str)
guard url != nil else { return }
self.cancellable = URLSession.shared.dataTaskPublisher(for: url!)
.map({ $0.data })
.receive(on: RunLoop.main)
.map({ UIImage(data: $0) })
.replaceError(with: nil)
.receive(on: RunLoop.main)
.sink(receiveValue:
{ [weak self] resultSet in
self?.image = resultSet
if resultSet != nil { self?.ptSubject.send( resultSet! ) } // for UIView
})
}

// Automatic Cancel on deInit

}

4. UIView

protocol RepresentationClosingProtocol
{
func closeMe()

}


// Combine 1
private var webImageLoader = WebImageDownloader()
var subs : AnyCancellable? = nil



ON didLoad

// Combine 2

subs = webImageLoader.uiiPublisher
.removeDuplicates()
.sink( receiveValue: { [self] uii in setupForStillAnimationFrom(thisUII: uii) } )

CALayer for Animation

func setupForStillAnimationFrom(thisUII : UIImage )
{
cgImageB = thisUII.cgImage
guard cgImageB != nil else { return }

alayer.opacity = 1.0
alayer.contents = cgImageB
iAspect = CGFloat( (cgImageB?.width)! ) / CGFloat( (cgImageB?.height)! )
}