全部，此代码现在不会引发错误，但是屏幕为空白。我正在尝试创建一个简单的计算器。用户将数字输入到3个单独的UIText字段中，按一个按钮，UILabel会给出答案。我知道我还没有标签。我首先建立了一个容纳文本字段的容器，但是我的“ CalculateTapped”看不到textFields作为变量。
问题。 1为什么我的屏幕现在变黑？题。 2.为什么我不能让CalculateTapped从我的惰性var“”视图中读取UIText字段？
[如果有人有任何意见，我将不胜感激。试图摆脱情节提要。
导入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))
}
}
import UIKit
class PitchLineVC: UIViewController {
lazy var pitchlogoView: UIImageView = {
let iv = UIImageView()
iv.contentMode = .scaleAspectFit
iv.clipsToBounds = true
iv.image = #imageLiteral(resourceName: "PITCH LINE")
return iv
}()
lazy var areaTxt: UITextField! = {
let tf = UITextField()
tf.placeholder = "Bar Area"
tf.textAlignment = .center
tf.borderStyle = UITextField.BorderStyle.line
tf.backgroundColor = UIColor.white
tf.textColor = UIColor.black
tf.keyboardType = UIKeyboardType.decimalPad
return(tf)
}()
lazy var areaTop: UITextField! = {
let tf = UITextField()
tf.placeholder = "Top Area of Bar"
tf.textAlignment = .center
tf.borderStyle = UITextField.BorderStyle.line
tf.backgroundColor = UIColor.white
tf.textColor = UIColor.black
tf.keyboardType = UIKeyboardType.decimalPad
return(tf)
}()
lazy var lineLength: UITextField! = {
let tf = UITextField()
tf.placeholder = "Line Length"
tf.textAlignment = .center
tf.borderStyle = UITextField.BorderStyle.line
tf.backgroundColor = UIColor.white
tf.textColor = UIColor.black
tf.keyboardType = UIKeyboardType.decimalPad
return (tf)
}()
lazy var movepitchline1: UILabel = {
let lb = UILabel()
lb.textAlignment = .right
lb.frame = CGRect(x: 10, y: 380, width: 220, height: 35)
lb.text = "Move Pitch: + is up, - is down"
lb.textAlignment = .center
lb.font = UIFont.boldSystemFont(ofSize: 23)
lb.textColor = .black
return (lb)
}()
lazy var movepitchline: UILabel = {
let lb = UILabel()
lb.textAlignment = .right
lb.frame = CGRect(x: 10, y: 380, width: 220, height: 35)
lb.text = ""
lb.textAlignment = .center
lb.font = UIFont.boldSystemFont(ofSize: 23)
lb.textColor = .black
return (lb)
}()
let calculateButton: UIButton = {
let button = UIButton(type: .system)
button.backgroundColor = UIColor.init(red: 48/255, green: 173/255, blue: 99/255, alpha: 1)
button.layer.cornerRadius = 25.0
button.tintColor = UIColor.white
button.layer.shadowColor = UIColor.darkGray.cgColor
button.layer.shadowRadius = 6
button.layer.shadowOpacity = 0.7
button.layer.shadowOffset = CGSize(width: 0, height: 0)
button.setTitle("Calculate", for: .normal)
button.titleLabel?.font = UIFont(name: "Copperplate", size: 22)
button.addTarget(self, action: #selector(handleCalculate), for: .touchUpInside)
return button
}()
@objc func handleDismiss(notification: NSNotification) {
dismiss(animated: true, completion: nil)
}
//sets trigger for keyboard dismiss
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
view.endEditing(true)
super.touchesBegan(touches, with: event)
}
// Mark: Init
override func viewDidLoad() {
super.viewDidLoad()
configureNavigationBar()
configureViewComponent()
// 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
}
// Mark: Selectors
@objc func handleCalculate()
{
print("calculate")
guard let AreaTotal = Double(areaTxt.text!) else {return}
guard let AreaTop = Double(areaTop.text!) else {return}
guard let Line = Double(lineLength.text!) else {return}
if AreaTotal != 0 && AreaTop != 0 && Line != 0{
let LineMove = -(((AreaTotal / 2) - AreaTop) / Line)
print(LineMove)
movepitchline.text = NSString(format: "%.3f", LineMove) as String
} else{
print("Error in fields, please check entry")
}
}
func configureViewComponent(){
view.backgroundColor = .white
view.addSubview(pitchlogoView)
pitchlogoView.anchor(top: view.topAnchor, left: view.leftAnchor, bottom: nil, right: view.rightAnchor, paddingTop: 120, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, width: 250, height: 110)
view.addSubview(areaTxt)
areaTxt.anchor(top: pitchlogoView.bottomAnchor, left: view.leftAnchor, bottom: nil, right: view.rightAnchor, paddingTop: 15, paddingLeft: 80, paddingBottom: 0, paddingRight: 80, width: 0, height: 30)
view.addSubview(areaTop)
areaTop.anchor(top: areaTxt.bottomAnchor, left: view.leftAnchor, bottom: nil, right: view.rightAnchor, paddingTop: 20, paddingLeft: 80, paddingBottom: 0, paddingRight: 80, width: 0, height: 30)
view.addSubview(lineLength)
lineLength.anchor(top: areaTop.bottomAnchor, left: view.leftAnchor, bottom: nil, right: view.rightAnchor, paddingTop: 20, paddingLeft: 80, paddingBottom: 0, paddingRight: 80, width: 0, height: 30)
view.addSubview(calculateButton)
calculateButton.anchor(top: lineLength.bottomAnchor, left: view.leftAnchor, bottom: nil, right: view.rightAnchor, paddingTop: 30, paddingLeft: 32, paddingBottom: 0, paddingRight: 32, width: 0, height: 50)
view.addSubview(movepitchline1)
movepitchline1.anchor(top: calculateButton.bottomAnchor, left: view.leftAnchor, bottom: nil, right: view.rightAnchor, paddingTop: 10, paddingLeft: 32, paddingBottom: 0, paddingRight: 32, width: 0, height: 40)
view.addSubview(movepitchline)
movepitchline.anchor(top: movepitchline1.bottomAnchor, left: view.leftAnchor, bottom: nil, right: view.rightAnchor, paddingTop: 10, paddingLeft: 32, paddingBottom: 0, paddingRight: 32, width: 0, height: 40)
}
// 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 = 165 - keyboardSize.height
}
@objc func keyboarWillHide(notification: NSNotification){
self.view.frame.origin.y = 0
}
// select outside text box to dismiss selection
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))
}
}