I’m new to coding, and solely know swift, obj-C continues 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 wish to do. Can anybody please assist inform me what I’m doing unsuitable within the following code snippet. I’m making a uncooked transaction nonetheless i get a bizarre response when decoding it the place the handle arrays are empty or null. One thing may be very unsuitable, if anybody has any expertise I’d so significantly recognize 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(handle: addressToSpendFrom)
}
func getUTXOforAddress(handle: String) {
var url:NSURL!
url = NSURL(string: "https://api.blockcypher.com/v1/btc/test3/addrs/(handle)?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.most important.async {
displayAlert(viewController: self, title: "Error", message: "Please verify your interent connection.")
}
} else {
if let urlContent = information {
do {
let jsonUTXOResult = attempt 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.most important.async {
displayAlert(viewController: self, title: "Error", message: "Please verify your interent connection.")
}
} else {
if let urlContent = information {
do {
let txHashResult = attempt 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.most important.async {
displayAlert(viewController: self, title: "Error", message: "Please attempt once more.")
}
}
}
}
}
}
job.resume()
}
}
} catch {
print("JSon processing failed")
DispatchQueue.most important.async {
displayAlert(viewController: self, title: "Error", message: "Please attempt once more.")
}
}
}
}
}
}
job.resume()
}
func callBTCTransaction() {
let handle = 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 end result:BTCTransactionBuilderResult? = nil
do {
end result = attempt newTransaction.buildTransaction()
print("transactionRaw = (String(describing: end result?.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()
}
}
