all, this code does not throw errors now but the screen is blank. I am trying to create a simple calculator. user will input numbers into 3 separate UIText fields, push a button and a UILabel would give answer. I know i do not have labels yet. i first built a container to hold text fields but then my "CalculateTapped" could not see the textFields as variables.
Question. 1 why is my screen now black? Question. 2. why could i not get CalculateTapped to read UIText fields from my lazy var "" view earlier?
If anyone has any input i would greatly appreciate it. trying to get away from storyboards.
import UIKit
class PitchLineVC: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let view = UIView()
()
view.backgroundColor = .white
view.anchor(top: view.topAnchor, left: view.leftAnchor,bottom: view.bottomAnchor, right: view.rightAnchor);
configureNavigationBar()
// looks for keyboard instance
NotificationCenter.default.addObserver(self, selector: #selector(PitchLineVC.keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(PitchLineVC.keyboarWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)
}
// keeps screen from rotating
override var shouldAutorotate: Bool {
return false
}
// Add text fields for user input to calculate pitch
private lazy var areaTxt: UITextField! = {
let area = UITextField()
area.centerXAnchor.constraint(equalTo: view.centerXAnchor, constant: -100).isActive = true
area.centerYAnchor.constraint(equalTo: view.centerYAnchor, constant: -300).isActive = true
area.placeholder = "Bar Area"
area.textAlignment = .center
area.borderStyle = UITextField.BorderStyle.line
area.backgroundColor = UIColor.white
area.textColor = UIColor.black
area.keyboardType = UIKeyboardType.decimalPad
// view.addSubview(area)
return(area)
}()
private lazy var areaTop: UITextField! = {
let area = UITextField()
area.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
area.centerYAnchor.constraint(equalTo: view.centerYAnchor, constant: -200).isActive = true
area.placeholder = "Top Area of Bar"
area.textAlignment = .center
area.borderStyle = UITextField.BorderStyle.line
area.backgroundColor = UIColor.white
area.textColor = UIColor.black
area.keyboardType = UIKeyboardType.decimalPad
// view.addSubview(area)
return(area)
}()
private lazy var lineLength: UITextField! = {
let line = UITextField()
line.centerXAnchor.constraint(equalTo: view.centerXAnchor, constant: -100).isActive = true
line.centerYAnchor.constraint(equalTo: view.centerYAnchor, constant: -300).isActive = true
// line.anchor(top: view.bottomAnchor, paddingTop: -80,width: 100, height: 35)
line.placeholder = "Line Length"
line.textAlignment = .center
line.borderStyle = UITextField.BorderStyle.line
line.backgroundColor = UIColor.white
line.textColor = UIColor.black
line.keyboardType = UIKeyboardType.decimalPad
// view.addSubview(line)
return (line)
}()
@objc func CalculateTapped(){
print("Button Tapped")
let AreaTotal = Double(areaTxt.text!)
let AreaTop = Double(areaTop.text!)
let Line = Double(lineLength.text!)
if AreaTotal != nil && AreaTop != nil && Line != nil{
let LineMove = -(((AreaTotal! / 2) - AreaTop!) / Line!)
movepitchline.text = NSString(format: "%.3f", LineMove) as String
}
}
func addCalculateButton(){
let Calculate = UIButton()
Calculate.addTarget(self, action: #selector(CalculateTapped), for: .touchUpInside)
Calculate.centerXAnchor.constraint(equalTo: view.centerXAnchor, constant: -100).isActive = true
Calculate.centerYAnchor.constraint(equalTo: view.centerYAnchor, constant: -400).isActive = true
Calculate.anchor(top: view.bottomAnchor, paddingTop: -80,
width: 100, height: 35)
view.addSubview(Calculate)
}
let movepitchline: UILabel = {
let label = UILabel()
label.textAlignment = .right
label.frame = CGRect(x: 10, y: 380, width: 220, height: 35)
label.text = "Move Pitch:"
label.font = UIFont.boldSystemFont(ofSize: 23)
label.textColor = .black
return label
}()
// When keyboard displays the UIView shift up
@objc func keyboardWillShow(notification: NSNotification) {
guard let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue else {
// if keyboard size is not available for some reason, dont do anything
return
}
// move the root view up by the distance of keyboard height
self.view.frame.origin.y = 150 - keyboardSize.height
}
@objc func keyboarWillHide(notification: NSNotification){
self.view.frame.origin.y = 0//\\100 + keyboardSize.height
}
// select outside text box to dismiss selection
@objc func handleDismiss(notification: NSNotification) {
dismiss(animated: true, completion: nil)
}
func configureNavigationBar() {
navigationController?.navigationBar.barTintColor = .appBlue
navigationController?.navigationBar.barStyle = .black
navigationItem.title = "Pass Pitch and Diameters"
navigationItem.leftBarButtonItem = UIBarButtonItem(image: #imageLiteral(resourceName: "Home_2x").withRenderingMode(.alwaysOriginal), style: .plain, target: self, action: #selector(handleDismiss))
}
}
