I’m new to coding, and solely know swift, obj-C remains to be overseas to me. I’ve a functioning pockets however for now am counting on BlockCypher API to construct a transaction which I do NOT need to do. Can anybody please assist inform me what I’m doing fallacious within the following code snippet. I’m making a uncooked transaction nevertheless i get a bizarre response when decoding it the place the deal with arrays are empty or null. One thing may be very fallacious, if anybody has any expertise I’d so vastly respect it as that is driving me loopy.
import UIKit
class BuildTransactionViewController: UIViewController, BTCTransactionBuilderDataSource {
var addressToSpendFrom = "n1QQYAHbw3q6UjWN6Q4d9oqa6u5iUDnPHT"
var privateKeyToSign = "cNeZkP1QPQ37C4rLvoQ8xZ5eujcjsYHZMj8CLfPPohYPvfKhzHWu"
var receiverAddress = "n1v9HH9Abs36fYf8KbwnFUfzR4prLBXhtW"
var inputData = [NSDictionary]()
var scriptArray = [String]()
var transaction = BTCTransaction()
override func viewDidLoad() {
tremendous.viewDidLoad()
getUTXOforAddress(deal with: addressToSpendFrom)
}
func getUTXOforAddress(deal with: String) {
var url:NSURL!
url = NSURL(string: "https://api.blockcypher.com/v1/btc/test3/addrs/(deal with)?unspentOnly=true")
let job = URLSession.shared.dataTask(with: url! as URL) { (information, response, error) -> Void in
do {
if error != nil {
print(error as Any)
DispatchQueue.essential.async {
displayAlert(viewController: self, title: "Error", message: "Please test your interent connection.")
}
} else {
if let urlContent = information {
do {
let jsonUTXOResult = strive JSONSerialization.jsonObject(with: urlContent, choices: JSONSerialization.ReadingOptions.mutableLeaves) as! NSDictionary
print("json = (jsonUTXOResult)")
if let utxoCheck = jsonUTXOResult["txrefs"] as? NSArray {
self.inputData = utxoCheck as! [NSDictionary]
print("utxoCheck = (utxoCheck)")
for merchandise in self.inputData {
let transactionHash = (merchandise)["tx_hash"] as! String
let worth = (merchandise)["value"] as! Int
var url:NSURL!
url = NSURL(string: "https://api.blockcypher.com/v1/btc/test3/txs/(transactionHash)")
let job = URLSession.shared.dataTask(with: url! as URL) { (information, response, error) -> Void in
do {
if error != nil {
print(error as Any)
DispatchQueue.essential.async {
displayAlert(viewController: self, title: "Error", message: "Please test your interent connection.")
}
} else {
if let urlContent = information {
do {
let txHashResult = strive JSONSerialization.jsonObject(with: urlContent, choices: JSONSerialization.ReadingOptions.mutableLeaves) as! NSDictionary
print("txHashResult = (txHashResult)")
if let outputsCheck = txHashResult["outputs"] as? NSArray {
print("outputs = (outputsCheck)")
for output in outputsCheck {
if let valueCheck = (output as! NSDictionary)["value"] as? Int {
if valueCheck == worth {
let script = (output as! NSDictionary)["script"] as! String
self.scriptArray.append(script)
print("script = (script)")
}
}
}
print("inputData = (self.inputData)")
print("scriptArray = (self.scriptArray)")
self.callBTCTransaction()
}
} catch {
print("JSon processing failed")
DispatchQueue.essential.async {
displayAlert(viewController: self, title: "Error", message: "Please strive once more.")
}
}
}
}
}
}
job.resume()
}
}
} catch {
print("JSon processing failed")
DispatchQueue.essential.async {
displayAlert(viewController: self, title: "Error", message: "Please strive once more.")
}
}
}
}
}
}
job.resume()
}
func callBTCTransaction() {
let deal with = BTCAddress(string: self.receiverAddress)
let newTransaction = BTCTransactionBuilder()
newTransaction.dataSource = self
newTransaction.shouldSign = true
newTransaction.changeAddress = BTCAddress(string: self.addressToSpendFrom)
newTransaction.outputs = [BTCTransactionOutput(value: BTCAmount(1000), address: address)]
newTransaction.feeRate = BTCAmount(2000)
var consequence:BTCTransactionBuilderResult? = nil
do {
consequence = strive newTransaction.buildTransaction()
print("transactionRaw = (String(describing: consequence?.transaction.hex))")
} catch {
print("error = (error as Any)")
}
}
func transactionBuilder(_ txbuilder: BTCTransactionBuilder!, keyForUnspentOutput txout: BTCTransactionOutput!) -> BTCKey! {
print("transactionBuilder")
let key = BTCKey.init(wif: self.privateKeyToSign)
key?.isPublicKeyCompressed = true
return key
}
func unspentOutputs(for txbuilder: BTCTransactionBuilder!) -> NSEnumerator! {
let outputs = NSMutableArray()
for (index, merchandise) in inputData.enumerated() {
let txout = BTCTransactionOutput()
txout.worth = BTCAmount((merchandise).worth(forKey: "worth") as! Int64)
txout.script = BTCScript.init(hex: self.scriptArray[index])
txout.index = UInt32((merchandise).worth(forKey: "tx_output_n") as! Int)
txout.confirmations = UInt((merchandise).worth(forKey: "confirmations") as! Int)
let transactionHash = (merchandise)["tx_hash"] as! String
txout.transactionHash = transactionHash.information(utilizing: .utf8)
outputs.add(txout)
}
print("outputs = (outputs)")
return outputs.objectEnumerator()
}
}
