Crypto4FunKit 📦

Crypto4FunKit is a Swift Package for people who want to implement easily cryptocurrencies and NFT informations, chart of the crypto's price, and news.

FetchCrypto

fetchCryptoCurrency() function allows you to fetch 100 cryptocurrencies data as image, currentPrice, price percantage value (24h) and more.

In your ViewModel, initialise a @Published empty array corresponsing to CryptoCurrencyModel for get the good type returning from the fetchCryptoCurrency() function.

import Crypto4FunKit

class CryptoViewModel: ObservableObject {
@Published public var cryptoCurrencies: [CryptoCurrencyModel] = [CryptoCurrencyModel]()

	@MainActor func getCryptos() async throws {
		 do {
			 cryptoCurrencies = try await CryptoApi.fetchCryptoCurrency()
		 } catch {
			 print("Error")
		 }
	 }
 }

Then, you have to use .task on your List view.

struct CryptoCurrencyListView: View {
	@EnvironmentObject var crypto: CryptoViewModel

    var body: some View {
	List {
		ForEach(crypto.cryptoCurrencies, id: \.id) { crypto in
			NavigationLink(destination: CurrencyChartView(cryptoCurrency: crypto)) {
				CryptoListRowCellView(cryptoCurrency: crypto)
			}
		}
	}
	.task {
	      do {
			try await crypto.getCryptos()
		} catch {
			print("Error \(error.localizedDescription)")
	    }
	} 
    }
}

FetchCryptoChart

fetchChart(_ id: String, from firstDate: Double, to today: Double = Date().timeIntervalSince1970) function allows you to fetch an [[Double]] of crypto price from the id and date in Epoch format.

In your ViewModel, initialise a @Published empty array of [[Double]] for get the good data for your chart.

import Crypto4FunKit

class FetchChartViewModel: ObservableObject, FetchChart {
	@Published var prices: [[Double]] = [[Double]]()
	
	@MainActor func getChart(_ id: String, from firstDate: Double, to today: Double = Date().timeIntervalSince1970) async throws {
		do {
			let data = try await ChartApi.fetchChart(id, from: firstDate)
			prices = data.prices
		} catch {
			print("Error \(error.localizedDescription)")
		}
	}
}

Then, you have to use use @EnvironmentObject for get your ViewModel data in prices array and use .task on your chart view.

.task {
	do {
		try await fetchChart.getChart(cryptoCurrency.id, from: Date().timeIntervalSince1970 - (Double(EpochUnixTime.month.rawValue) ?? 0))
	} catch {
		print("Error")
	}
}

You can see Crypto4Fun made in [SwiftUI](https://github.com/Harry-KNIGHT/Crypto4Fun-SwiftUI and UIKit for know how I use it.

Authors

• Harry-Knight
• NylNeuville

Coach

• Mickael MAS

Formation

Follow Swift Basics formation from Mickaël MAS Apple certified trainer for improve your swift learning: Swift Basics Formation

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