Hey guys, Im currently making a cmp app for androi...

# multiplatform

[Benjamin]

Hey guys, Im currently making a cmp app for android and ios. I need to display a pdf in the app and haven't found a library for it. I implemented it myself in android, but im having some problems with ios. It's my first app and I'm getting really confused. I use this git repo as a reference (https://github.com/swapnil-musale/KMP-PDF-Viewer/blob/master/shared/src/iosMain/kotlin/com/devx/pdfviewerkmp/di/ViewModelModules.kt), I could understand the android part but im really confused for the ios part. Could somebody with a better understanding explain it quickly to me? How do I call swift code from my kotlin code? Also, what is the use of iosApp and iosMain, where am I supposed to write my platform specific code?

[Swapnil Musale]

This repository is created to demonstrate how we can display PDF in KMP project using (Jetpack Compose and Swift UI).

To write platform specific code use iosMain sourceSet

[Swapnil Musale]

To use PDFView component in ComposeMultiplatform you can use UIKitView for more info check here : https://www.jetbrains.com/help/kotlin-multiplatform-dev/compose-uikit-integration.html#use-uikit-inside-compose-multiplatform

[Benjamin]

Do you know how give the pdf to PDFView? I have tried it earlier, but I dont what to give it so it displays my pdf. The pdf is hosted online for the moment. The repo was really usefull for android but I dont have the knowledge at the moment for it to help me in ios

[Swapnil Musale]

To display PDF, I have passed base64 string to PDFView

[Benjamin]

So I have this right now:

val encoded = Base64.encode(pdf.value)
UIKitView(
    factory = { PDFView() },
    modifier = Modifier.fillMaxSize(),
    update = {
        it.autoScales = true
        it.document = PDFDocument(/* what to give here */)
    }
)

I have tried to create the PDFDocument, but I haven't found a way for it to have the right type so it compiles. It wants either an NSURL or NSData, but I was unable to create it. l wasn't able to translate your code from swift to kotlin using a UIKitView. Do you know how I could do it? Our project structure are really different so im having a hard time doing it from your project

[Benjamin]

I was able to make it work following another question that was asked here a couple of months ago. This is what I have right now that works:

UIKitView(modifier = Modifier.fillMaxSize(),
    factory = {
        WKWebView()
    },
    update = { webView ->
        webView.loadRequest(
            NSURLRequest.requestWithURL(
                NSURL.URLWithString("<https://myreport.altervista.org/Lorem_Ipsum.pdf>")!!
            )
        )
    }
)

[Swapnil Musale]

I have not tried loading pdf from UIKitView, will try in my spare time and update you

[Benjamin]

thank you very much for your help