When the ViewController is displayed on the phone the Label is not displayed
I am new to iOS and swift, I have search YouTube extensively to no avail. In the code you can see I have made two attempts to add two labels. Not that none are showing. The navigation elements are working correctly. The background is being set correctly also.
import UIKit
class WelcomeController: UIViewController {
// MARK: - Properties
var pageTitle: UILabel!
// MARK: - Init
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .white
let frameLabel:CGRect = CGRect(x: 20, y: 0, width: UIScreen.main.bounds.width - 20, height: 50)
let label:UILabel = UILabel(frame: frameLabel)
label.text = "This text is not showing up on the screen!!! his text is not showing up on the screen!!! his text is not showing up on the screen!!!"
label.textColor = .black
label.textAlignment = .center
view.addSubview(label)
configureUI()
configurePageTitleLabel()
}
// MARK: - Selectors
#objc func handleDismiss() {
dismiss(animated: true, completion: nil)
}
// MARK: - Helper Functions
func configureUI() {
navigationController?.navigationBar.barTintColor = .blue
navigationItem.title = "Welcome"
let textAttributes = [NSAttributedString.Key.foregroundColor:UIColor.white]
navigationController?.navigationBar.titleTextAttributes = textAttributes
navigationItem.leftBarButtonItem = UIBarButtonItem(image: #imageLiteral(resourceName: "ic_menu_white_3x").withRenderingMode(.alwaysOriginal), style: .plain, target: self, action: #selector(handleDismiss))
}
// MARK - Page Contents Functions
func configurePageTitleLabel() {
pageTitle = UILabel()
pageTitle.text = "Welcome"
pageTitle.textAlignment = .center
pageTitle.textColor = .black
let frameTitle:CGRect = CGRect(x: 20, y: 20, width: UIScreen.main.bounds.width - 20, height: 50)
pageTitle.drawText(in: frameTitle)
view.addSubview(pageTitle)
view.backgroundColor = .gray
}
}
The y value should be more than 64 ie. 20 status bar + 44 Navigation bar.
Also, you don't need drawText and frame tile.
Simply adding
pageTitle.frame = CGRect(x: 20, y: 200, width: UIScreen.main.bounds.width - 20, height: 50)
would work.
Related
I'm trying to create a welcome onboarding for the first time users but none of the views are loafing in the simulator, all I'm getting is a red background when the onboardingVC gets presented. Can anyone see the issue as to why the titles, buttons, and images won't appear?
This is the message I'm getting in the console:
Warning: Attempt to present <EMA.WalkthroughVC: 0x7faa2401e5b0> on <EMA.HomeVC: 0x7faa22407e00> whose view is not in the window hierarchy!
FOUND ALL!!
let holderView: UIView = {
let view = UIView()
view.translatesAutoresizingMaskIntoConstraints = true
view.backgroundColor = .darkGray
return view
}()
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor.white
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
view.backgroundColor = UIColor.red
configure()
}
private func configure() {
let scrollView = UIScrollView(frame: holderView.bounds)
holderView.addSubview(scrollView)
let titles = ["Hi","Welcome","real nigga"]
for x in 0..<3 {
let pageView = UIView(frame: CGRect(x: CGFloat(x) * holderView.frame.size.width, y: 0, width: holderView.frame.size.width, height: holderView.frame.size.height))
scrollView.addSubview(pageView)
let label = UILabel(frame: CGRect(x: 10, y: 10, width: pageView.frame.size.width-20, height: 120))
let imageView = UIImageView(frame: CGRect(x: 10, y: 10+120+10, width: pageView.frame.size.width-20, height: pageView.frame.size.height - 60 - 130 - 15))
let button = UIButton(frame: CGRect(x: 10, y: pageView.frame.size.height - 60, width: pageView.frame.size.width-20, height: 50))
label.textAlignment = .center
label.font = UIFont.systemFont(ofSize: 16, weight: .semibold)
pageView.addSubview(label)
label.text = titles[x]
imageView.contentMode = .scaleAspectFill
imageView.image = UIImage(named: "BankCard\(x)")
pageView.addSubview(imageView)
button.setTitleColor(.red, for: .normal)
button.backgroundColor = .black
button.setTitle("Continue", for: .normal)
if x == 2 {
button.setTitle("Get Started", for: .normal)
}
button.addTarget(self, action: #selector(didTapButton), for: .touchUpInside)
pageView.addSubview(button)
}
}
#objc func didTapButton(_ button: UIButton) {
}
}
"whose view is not in the window hierarchy"
you didn't add the views that you created to the main view try to add the subviews to the main by using this one
self.view.addSubview(holderView)
also don't forget to add the frame for the holder view like that
UIView(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height))
view.translatesAutoresizingMaskIntoConstraints = true
and inside the view did load
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor.white
self.view.addSubview(holderView)
}
I am trying to make a playground and I have a button that says "Let's play!" and moves into a new view controller.
I looked at the code from this website and put it into my code:
http://lab.dejaworks.com/ios-swift-3-playground-uibutton-action/
This is all of my code (like, all of it):
import UIKit
import PlaygroundSupport
class MyViewController : UIViewController {
override func loadView() {
//Introduction
let view = UIView()
view.backgroundColor = .red
//title
func labelCool() {
let label = UILabel()
label.frame = CGRect(x: 50, y: 300, width: 400, height: 100)
label.text = "Add-Add - A Wonderful Game!"
//label.frame = CGRect(x: 150, y: 200, width: 200, height: 20)
label.numberOfLines = 3
label.font = UIFont(name: "HelveticaNeue-Bold", size: 30)
UILabel.animate (withDuration: 10.0, animations:{
label.textColor = .black
})
UILabel.animate(withDuration: 5.0, animations:{
label.textColor = .blue
})
view.addSubview(label)
}
labelCool()
//subtitle
let subtitle = UILabel()
subtitle.frame = CGRect(x: 50, y: 400, width: 200, height: 50)
subtitle.text = "Curated and Created by Yours Truly, Adit Dayal!"
subtitle.numberOfLines = 4
self.view = view
view.addSubview(subtitle)
}
override func viewDidLoad() {
class Responder : NSObject {
#objc func action() {
print("Yay!")
}
}
let responder = Responder()
//next page
let button = UIButton(frame : CGRect(x: 0, y: 500, width: 200, height: 50))
button.setTitle("Let's Play!", for: .normal)
button.backgroundColor = .blue
button.addTarget(responder, action: #selector(Responder.action), for: .touchUpInside)
view.addSubview(button)
}
}
class gameViewController: UIViewController {
}
// Present the view controller in the Live View window
PlaygroundPage.current.liveView = MyViewController()
For now, I just want the button to display "Yay!" when clicked, but it is doing nothing!
Does anyone know why? (I'm on a bit of a time constraint)
Thank you so much,
Adit Dayal
Your Responder class is inside the viewDidLoad() function put the class outside like so
class Responder : NSObject {
#objc func action() {
print("Yay!")
}
}
override func viewDidLoad() {
let responder = Responder()
//next page
let button = UIButton(frame : CGRect(x: 0, y: 500, width: 200, height: 50))
button.setTitle("Let's Play!", for: .normal)
button.backgroundColor = .blue
button.addTarget(responder, action: #selector(responder.action), for: .touchUpInside)
view.addSubview(button)
}
The problem is that you are creating the responder object inside the viewDidLoad, as a local variable; this cause the object to be destroyed when the function ends (but we want that object alive even after). You have to retain that object, so instead of creating a local variable, create an instance variable by simply saving it as a class scope:
class Responder : NSObject {
#objc func action() {
print("Yay!")
}
}
let responder = Responder() // this is now outside the viewDidLoad, so it's an instance variable
override func viewDidLoad() {
//next page
let button = UIButton(frame : CGRect(x: 0, y: 500, width: 200, height: 50))
button.setTitle("Let's Play!", for: .normal)
button.backgroundColor = .blue
button.addTarget(responder, action: #selector(Responder.action), for: .touchUpInside)
view.addSubview(button)
}
I've got a small question: is it possible somehow (without storyboard) to create a little view at the top of the screen (if there's a navigationbar, then under that), that displays errors / responses if needed?
Without creating views on every single viewController I made, just by code?
Or is there some extension you could recommend?
For example: "No Internet Connection"
You can check this answer - https://stackoverflow.com/a/49129636/6080920
Code required
extension UIViewController
{
func showNotificationView(message : String)
{
//base View
let baseView = UIView(frame: CGRect(x: 20, y: self.view.frame.size.height-(self.view.frame.size.height*0.15), width: self.view.frame.size.width-40, height: self.view.frame.size.height*0.08))
baseView.backgroundColor = UIColor.gray
baseView.clipsToBounds=true
self.view.addSubview(baseView)
//Image View
let imageView = UIImageView(image: UIImage(named: "RM_3"))
imageView.clipsToBounds=true
imageView.frame = CGRect(x: 0, y: 0, width: baseView.frame.size.width*0.2, height: baseView.frame.size.height)
baseView.addSubview(imageView)
//Label
let textLabel = UILabel(frame: CGRect(x: baseView.frame.size.width*0.2+10, y: 0, width: baseView.frame.size.width, height: baseView.frame.size.height))
textLabel.textColor = UIColor.white
textLabel.backgroundColor = UIColor.clear
textLabel.textAlignment = .left;
textLabel.numberOfLines = 0
textLabel.font = UIFont(name: "Montserrat-Light", size: 12.0)
textLabel.text = message
baseView.addSubview(textLabel)
}
}
Usage
#IBAction func navigate(_ sender: Any) {
self.showNotificationView(message: "hihihihh")
}
I have a label that is supposed to display a score, and a button that is supposed to increase that score each time it's pressed. My problem is that I get an error no matter where I put my function.
If I have the function above the viewDidLoad class then I get an error because it comes before my label, but if I put it anywhere inside viewDidLoad I get an error because I can't call a local function, and if I put it anywhere after, then my button calling the function comes before the function.
Where am I supposed to put these things? Is there a better way of doing this all together? This was supposed to be so simple...
import UIKit
class ViewController: UIViewController {
let phrase = "Your score: "
var increasingNum = 0
func scoreGoUp (sender: UIButton){
increasingNum += 1
label.text = "\(phrase) \(increasingNum)"
}
override func viewDidLoad() {
super.viewDidLoad()
let label = UILabel(frame: CGRect(x: self.view.frame.size.width / 2 - 100, y: self.view.frame.size.height / 2 - 10, width: 200, height: 20))
label.textAlignment = .center
label.text = "\(phrase) \(increasingNum)"
self.view.addSubview(label)
let button = UIButton(frame: CGRect(x: self.view.frame.size.width / 2 - 150, y: 100, width: 300, height: 50))
button.backgroundColor = UIColor.cyan
button.addTarget(self, action: #selector(scoreGoUp), for: .touchUpInside)
self.view.addSubview(button)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
I have modified your code. Hope this help you.
class ViewController: UIViewController {
var label:UILabel!
let phrase = "Your score: "
var increasingNum = 0
override func viewDidLoad() {
super.viewDidLoad()
label = UILabel(frame: CGRect(x: self.view.frame.size.width / 2 - 100, y: self.view.frame.size.height / 2 - 10, width: 200, height: 20))
label.textAlignment = .center
label.text = "\(phrase) \(increasingNum)"
self.view.addSubview(label)
let button = UIButton(frame: CGRect(x: self.view.frame.size.width / 2 - 150, y: 100, width: 300, height: 50))
button.backgroundColor = UIColor.cyan
button.addTarget(self, action: #selector(scoreGoUp), for: .touchUpInside)
self.view.addSubview(button)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func scoreGoUp (sender: UIButton){
increasingNum += 1
label.text = "\(phrase) \(increasingNum)"
}
}
Here is the output
You need to define your label outside of viewDidLoad (like increasingNum), at the moment, your label variable is only visible inside viewDidLoad
var label:UILabel!
I have cleared up your code. The problem was that, you are not keeping track of you UILabel. Just declare a label to be visible in the class.
import UIKit
class ViewController: UIViewController {
let phrase = "Your score: "
var increasingNum = 0
var label: UILabel?
override func viewDidLoad() {
super.viewDidLoad()
let label = UILabel(frame: CGRect(x: self.view.frame.size.width / 2 - 100, y: self.view.frame.size.height / 2 - 10, width: 200, height: 20))
label.textAlignment = .center
label.text = "\(phrase) \(increasingNum)"
self.view.addSubview(label)
self.label = label
let button = UIButton(frame: CGRect(x: self.view.frame.size.width / 2 - 150, y: 100, width: 300, height: 50))
button.backgroundColor = UIColor.cyan
button.addTarget(self, action: #selector(scoreGoUp), for: .touchUpInside)
self.view.addSubview(button)
}
func scoreGoUp (sender: UIButton){
increasingNum += 1
self.label?.text = "\(phrase) \(increasingNum)"
}
}
Hope this helps!
I am trying to create a custom titleView for a navigation bar. I am able to set the titleView in the root view controller that is embedded in a navigation controller.
When I push the second view controller onto the stack and try to set the titleView for this view controller it does not work. The titleView quickly appears and disappears. When I go back to the previous view controller this titleView quickly appears and disappears now also.
Does anyone know why this is happening or how to set the titleView correctly without flashing and disappearing?
class FirstViewController: UIViewController {
var titleView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
addTitleView()
}
func addTitleView() {
titleView = UIView(frame: CGRect(x: 0, y: 0, width: 150, height: 44))
let companyLabel = UILabel(frame: CGRect(x: 0, y: 3, width: 150, height: 11))
companyLabel.text = "CPS Dashboard"
companyLabel.textColor = UIColor.grayColor()
companyLabel.textAlignment = .Center
companyLabel.font = UIFont.systemFontOfSize(9)
titleView.addSubview(companyLabel)
let titleLabel = UILabel(frame: CGRect(x: 0, y: 16, width: 150, height: 18))
titleLabel.text = "Dashboard"
titleLabel.textColor = UIColor.blackColor()
titleLabel.textAlignment = .Center
titleLabel.font = UIFont.systemFontOfSize(15)
titleView.addSubview(titleLabel)
navigationItem.titleView = titleView
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "Show" {
let controller = segue.destinationViewController as! SecondViewController
controller.titleView = titleView
}
}
}
The second viewcontroller:
class SecondViewController: UIViewController {
var titleView: UIView?
override func viewDidLoad() {
super.viewDidLoad()
if let titleView = titleView {
navigationItem.titleView = titleView
}
}
}
I found a solution. I copied addTitleView() method from FirstViewController into SecondViewController, and called both of them in viewDidLoad(). This worked exactly as I wanted it to. For some reason it was not working to pass the titleView forward as a property and assigning it to navigationItem.titleView.
class FirstViewController: UIViewController {
var titleView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
addTitleView()
}
func addTitleView() {
titleView = UIView(frame: CGRect(x: 0, y: 0, width: 150, height: 44))
let companyLabel = UILabel(frame: CGRect(x: 0, y: 3, width: 150, height: 11))
companyLabel.text = "CPS Dashboard"
companyLabel.textColor = UIColor.grayColor()
companyLabel.textAlignment = .Center
companyLabel.font = UIFont.systemFontOfSize(9)
titleView.addSubview(companyLabel)
let titleLabel = UILabel(frame: CGRect(x: 0, y: 16, width: 150, height: 18))
titleLabel.text = "Dashboard"
titleLabel.textColor = UIColor.blackColor()
titleLabel.textAlignment = .Center
titleLabel.font = UIFont.systemFontOfSize(15)
titleView.addSubview(titleLabel)
navigationItem.titleView = titleView
}
}
The second viewcontroller:
class SecondViewController: UIViewController {
var titleView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
addTitleView()
}
func addTitleView() {
titleView = UIView(frame: CGRect(x: 0, y: 0, width: 150, height: 44))
let companyLabel = UILabel(frame: CGRect(x: 0, y: 3, width: 150, height: 11))
companyLabel.text = "CPS Dashboard"
companyLabel.textColor = UIColor.grayColor()
companyLabel.textAlignment = .Center
companyLabel.font = UIFont.systemFontOfSize(9)
titleView.addSubview(companyLabel)
let titleLabel = UILabel(frame: CGRect(x: 0, y: 16, width: 150, height: 18))
titleLabel.text = "Dashboard"
titleLabel.textColor = UIColor.blackColor()
titleLabel.textAlignment = .Center
titleLabel.font = UIFont.systemFontOfSize(15)
titleView.addSubview(titleLabel)
navigationItem.titleView = titleView
}
}
My solution is simple, and it works:
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
if let tv = navigationItem.titleView {
print("transform", tv.transform)) // is always identity
let bounds = tv.bounds
print("bounds", bounds) // its origin may not be zero.
tv.bounds = CGRect(origin: .zero, size: bounds.size)
print("new bounds", tv.bounds)
}
}
Using Xcode's view debugger, you will find that titleView.bounds.origin is not zero.
How to let it happen again, two steps:
1. UIViewController A and B; A has custom navigationItem.titleView, B hides navigationBar in its viewWillAppear(); when B poped, A.viewWillAppear() setNavigationBar(hidden: false, animated: true)
2. user-driven popViewController is canceled by lifting your hand.
Then you will found, A's navigationBar is blank.
I was having this same issue, but none of the above solutions fixed it for me. My issue was that I was setting translatesAutoresizingMaskIntoConstraints to false. I imagine this caused the appearing/disappearing because it needs to be set to true in order to constrain the view internally to the navigation bar.