I wanted to programmatically control the menu view so I tried the following:
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var menuView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func menuBtn(_ sender: UIButton) {
print("menuBtn")
print(type(of: menuView!)) // <- `Thread 1:EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)`
}
}
And click the button, console says
fatal error: unexpectedly found nil while unwrapping an Optional value (lldb)
Both are connected to ViewController.
How can I get print(type(of: menuView!))?
===============================================================
ps.
I've simplified my real problem. this is my real code:
button on ViewController.Swift
#IBAction func openModal(_ sender: UIButton) {
print("open btn clicked")
let vc = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "menuViewController") as! MenuViewController
self.addChildViewController(vc)
self.view.addSubview(vc.contentView!) /// <- This cause problem
}
MenuViewController.swift
import UIKit
class MenuViewController: UIViewController {
#IBOutlet weak var contentView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor.clear
view.isOpaque = false
}
#IBAction func closeBtn(_ sender: UIButton) {
print("close btn clicked")
self.view.removeFromSuperview()
}
}
and Why I wan't using it:
I can't scrolling when menuView appeared.. I want to use the buttons in the menu view and scroll at the same time.
Related
I am not getting the proper solution, How to open UIKit ViewController(With Navigation Controller) from SwiftUI Button clicked.
You can do it by using the UIViewControllerRepresentable protocol which is used to manage your UIKit ViewController in the SwiftUI.
Here is the code to show your ViewController from SwiftUI View interface.
SwiftUI View
struct ContentView: View {
#State var isOpenView = false
var body: some View {
NavigationView {
VStack {
//show your view controller
NavigationLink(destination: TestControllerView(), isActive: $isOpenView) {
EmptyView()
}
Button(action: {
self.isOpenView = true
}){
Text("Tap Me")
}
}
}
}
}
Now wrap your ViewController into UIViewControllerRepresentable
struct TestControllerView : UIViewControllerRepresentable {
func updateUIViewController(_ uiViewController: UIViewControllerType, context: Context) {
}
func makeUIViewController(context: Context) -> some UIViewController {
guard let viewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(identifier: "TestViewController") as? TestViewController else {
fatalError("ViewController not implemented in storyboard")
}
return viewController
}
}
Here is your ViewController.Swift File code
import UIKit
class TestViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
#IBAction func btnBackClicked(_ sender : UIButton) {
self.dismiss(animated: true, completion: nil)
}
}
First, wrap your UIViewController in a UIViewControllerRepresantable like so.
Then present that View using .fullScreenCover
I need to open UIViewController from SwiftUI with UINavigation having back button.
Currently, I had implemented this via ViewControllerRepresentable and NavigationLink, its works, but I have two Navigations SwiftUI(NavigationLink with back button) and default UINavigation without back button, and I would like to perform to have my default UINavigation with the back button and hide SwiftUI(NavigationLink) navigation.
struct UIKitVc : UIViewControllerRepresentable {
let navigationController = UINavigationController()
func updateUIViewController(_ uiViewController: UINavigationController, context: Context) {
}
func makeUIViewController(context: Context) -> UINavigationController {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let viewController = storyboard.instantiateViewController(withIdentifier: "SearchResult") as! SearchResultViewController
self.navigationController.addChild(viewController)
return self.navigationController
}
}
NavigationLink(destination: UIKitVc(){}
Thank you in advance.
If you're going to use NavigationView/NavigationLink then you don't need to use UINavigationController, just use representable over your UIViewController, like
struct UIKitVc : UIViewControllerRepresentable {
func updateUIViewController(_ uiViewController: UIViewController, context: Context) {
}
func makeUIViewController(context: Context) -> UIViewController {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let viewController = storyboard.instantiateViewController(withIdentifier:
"SearchResult") as! SearchResultViewController
// ... make additional set up here if needed
return viewController
}
}
I have made a custom UIViewController called ViewControllerA and want to be able to use it so I made a UIViewControllerRepresentable called ViewControllerARepresentable as shown below, the problem though is that when I call ViewControllerARepresentable in my SwiftUI view and pass a value for stringToUpdateTextView, the ViewControllerA says the htmlTextView(UITextView) in ViewControllerA is nil and I'm not sure why.
ViewControllerARepresentable(stringToUpdateTextView: "<html>Send some Html Text as string here</html>")
ViewControllerARepresentable
public struct ViewControllerARepresentable: UIViewControllerRepresentable {
var stringToUpdateTextView: String
public func makeUIViewController(context: Context) -> ViewControllerA {
let viewcontrollerA = ViewControllerA(testString: testingString)
return viewcontrollerA
}
public func updateUIViewController(_ uiViewController: ViewControllerA, context: Context) {}
}
ViewControllerA
open class ViewControllerA: UIViewController {
public var stringToUpdateTextView: String
override open func viewDidLoad() {
super.viewDidLoad()
htmlTextView.text = stringToUpdateTextView
}
#IBOutlet weak var htmlTextView: UITextView!
public init(testString: String) {
self.testString = testString
super.init(nibName: nil, bundle: nil)
}
required public init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
Crash occurs at htmlTextView.text = stringToUpdateTextView saying that htmlTextView.text is nil even though its an IBOutlet.
Any Change made to the htmlTextView like background color ,etc, also causes a crash if called in viewDidAppear or viewDidLoad
When instantiating your view controller in makeUIViewController, the outlets haven't been initialised yet.
The following code loads your view controller from the storyboard, and updates the properties in updateUIViewController:
ViewController.swift
import UIKit
import SwiftUI
class ViewController: UIViewController {
#IBOutlet weak var htmlTextView: UITextView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
}
struct ViewControllerWrapper: UIViewControllerRepresentable {
typealias UIViewControllerType = ViewController
#Binding var text: String
func makeUIViewController(context: Context) -> ViewController {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
guard let viewController = storyboard.instantiateViewController(
identifier: "ViewController") as? ViewController else {
fatalError("Cannot load from storyboard")
}
return viewController
}
func updateUIViewController(_ uiViewController: ViewController, context: Context) {
uiViewController.htmlTextView.text = text
}
}
struct ViewControllerPreview: PreviewProvider {
static var previews: some View {
ViewControllerWrapper(text: .constant("hello world!"))
}
}
SwiftUIView.swift
struct SwiftUIView: View {
#State var text = "Text"
var body: some View {
HStack {
TextField("Text:", text: $text)
ViewControllerWrapper(text: $text)
}
}
}
I have a ViewControllertheir is a button at top right side. When i click that button i want to Show/Hide a UIView at bottom with size half of ViewControlleron same ViewController . Anyone help me. Thanks in advance.
If only Show/Hide a UIView is your requirement, below code will work:
class ViewController: UIViewController
{
#IBOutlet weak var viewHeightConstraint: NSLayoutConstraint!
#IBOutlet weak var customView: UIView!
override func viewDidLoad()
{
super.viewDidLoad()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.viewHeightConstraint.constant = self.view.bounds.height / 2
}
#IBAction func onShowHideButtonPress(_ sender: UIButton)
{
self.customView.isHidden = !self.customView.isHidden
}
}
Storyboard:
I want the user to be taken to a new viewController after clicking "use photo" after taking a picture. However, the segue is never performed. I have attempted this segue by connecting two viewControllers via a manual segue. I have a print statement in my imagePickerController function which is where my segue code is. This print statement prints when I click "use photo", so why is my segue be ignored? I tried this exact same segue code within a "#IBAction func someButton (_sender: UIButton)" and it worked fine? Any help would be appreciated.
Here is my code:
import UIKit
class ViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate {
#IBOutlet weak var imageTake: UIImageView!
var imagePicker: UIImagePickerController!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func takePhoto(_ sender: UIButton) {
imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = .camera
present(imagePicker, animated: true, completion: nil)
}
#IBAction func photoLib(_ sender: UIButton) {
imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = .photoLibrary
present(imagePicker, animated: true, completion: nil)
}
#IBAction func save(_ sender: AnyObject) {
UIImageWriteToSavedPhotosAlbum(imageTake.image!, self, #selector(image(_:didFinishSavingWithError:contextInfo:)), nil)
}
func image(_ image: UIImage, didFinishSavingWithError error: Error?, contextInfo: UnsafeRawPointer) {
if let error = error {
// we got back an error!
let ac = UIAlertController(title: "Save error", message: error.localizedDescription, preferredStyle: .alert)
ac.addAction(UIAlertAction(title: "OK", style: .default))
present(ac, animated: true)
} else {
let ac = UIAlertController(title: "Saved!", message: "Your altered image has been saved to your photos.", preferredStyle: .alert)
ac.addAction(UIAlertAction(title: "OK", style: .default))
present(ac, animated: true)
}
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
imagePicker.dismiss(animated: true, completion: nil)
imageTake.image = info[UIImagePickerControllerOriginalImage] as? UIImage
print("made it")
performSegue(withIdentifier: "new", sender: self)
}
}
Here's a suggestion. You have this:
imagePicker.dismiss(animated: true, completion: nil)
// ...
performSegue(withIdentifier: "new", sender: self)
Change it to this:
imagePicker.dismiss(animated: true, completion: {
performSegue(withIdentifier: "new", sender: self)
})
That way, we don't try to perform the segue until the image picker is in fact completely dismissed.
If that doesn't work, then I would have to conclude that there is no such segue as "new" coming from this view controller. But you have not shown your storyboard so I can't be certain.