I uses a TableView Controller to hold UILable in my habit tracker app. However, after I run Xcode, all the UILable disappear.
import UIKit
import RealmSwiftNewIdeaCreation: UITableViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
#IBAction func createButtonPressed(_ sender: UIButton) {
self.dismiss(animated: true, completion: nil)
}
}
Did I miss anything here?
Prototype cells are not showing without data source.
You can use static cells from the content type of tableView in the attributes inspector pan.
Related
I want a normal segue, so no pop-up. But when I push the button to go to the next ViewController, it shows as ab pop-up. The buttons to the next ViewController is in a different storyboard than the ViewController I'd like to go to.
This is the code of the first ViewController:
import UIKit
//some other code
class LoginViewController: UIViewController {
//some other code
override func viewDidLoad() {
super.viewDidLoad()
//some other code
}
#objc private func ProceedTapped(){
//Door naar storyboard van de daadwerkelijke app
print("Proceed clicked")
performSegue(withIdentifier: "goToAppIdentifier", sender: self)
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
}
}
And this is the code of the ViewController I'd like to go to:
import UIKit
class HomeScreen: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
print("Home has loaded")
}
}
The kind of the segue of the "Storyboard Segue" is "Show (e. g. push)"
You just have to go to story board select the 2nd view controller and change presentation style to "Full Screen". Please check below image for reference
I am looking for a Swift5 Color Picker and I came across the Color Picker of Rastislav Mirek.
I added the Picker as a Swift Package and followed the instructions in the Read Me file. For a simple start I wanted open the Color Picker as a modal and select a color. This color is set as a background then in the root view controller.
Even after having followed all steps I do not seem to get it working. I added the delegate and a button to trigger the segue to the modal.
Xcode drops an error like
Use of undeclared type "ColorPickerDelegate"
and
Use of unresolved identifier "colorPickerController"
Does anyone have an hint for me?
class ViewController: UIViewController, ColorPickerDelegate {
#IBOutlet weak var hexTextField: UITextField!
#IBAction func applyColorPressed(_ sender: UIButton) {
//self.view.backgroundColor = UIColor.green
let navigationController = UINavigationController(rootViewController: colorPickerController)
present(navigationController, animated: true, completion: nil)
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
}
I have an app with 6 UIViewControllers.
ANY viewcontroller features a function like this one:
#IBAction func onHelp(_ sender: UIBarButtonItem) {
DispatchQueue.main.async(execute: { () -> Void in
let helpVC = self.storyboard?.instantiateViewController(withIdentifier: "Help") as! HelpViewController
helpVC.starter = "MapHelp"
helpVC.helpSubtitle = "Map"
self.present(helpVC, animated: true, completion: nil)
})
}
Any IBAction in any viewcontroller presents the same HelpViewController but passing different parameters (starter and helpSubtitle).
Since I don't like to repeat code, first of all I thought this function should be converted to something more generic.
But: is there any way to create a generic IBAction, working for every viewcontroller?
Create a BaseViewController and add the generic method there.
class BaseViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
func genericMethod(starter: String, helpSubtitle: String){
let helpVC = self.storyboard?.instantiateViewController(withIdentifier: "Help") as! HelpViewController
helpVC.starter = starter
helpVC.helpSubtitle = helpSubtitle
self.present(helpVC, animated: true, completion: nil)
}
#IBAction func onHelp(_ sender: UIButton?) {
//You can use this method as generic IBaction if you want. It can be connected to buttons of all child View Controllers. But doing so will limit your param sending ability. On the plus side though, you won't have to define an IBAction everywhere and you can simply connect your child VC's button to Parent Class' IBAction.
}
}
Now inherit your ViewControllers from this class like:
import UIKit
class ViewController: BaseViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
#IBAction func btnTapped(_ sender: Any) {
genericMethod(starter: "View Controller", helpSubtitle: "I was triggered from VC1")
}
}
and
import UIKit
class SecondViewController: BaseViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
#IBAction func btnTapped(_ sender: Any) {
genericMethod(starter: "View Controller 2", helpSubtitle: "I was triggered from VC2")
}
}
That's it. Both your ViewControllers can call the parent method. If you still want to use the generic IBAction, you can do that too but I'd not recommend that course given that you want to pass params that can vary. If you wanted to do it though, it would look like this:
Bear in mind, the ViewController here has been inherited from the base ViewController which is why it can access the IBActions defined in the parent class. All you have to do is drag and connect.
I have been struggling to pass data between view controllers using segues. I have watched many youtube video tutorials and searched around on forums but I can't figure out why it won't work. I don't get any error messages but when I click the 'Button' the simulator crashes. I would love some help! Thanks!
Here is the code :
ViewController1 :
import UIKit
class ViewController: UIViewController {
#IBOutlet var textField: UITextField!
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.
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let destViewController : ViewController2 = segue.destinationViewController as! ViewController2
destViewController.labelText = textField.text!
}
}
ViewController2 :
import Foundation
import UIKit
class ViewController2 : UIViewController {
#IBOutlet var Label: UILabel!
var labelText : String = ""
override func viewDidLoad() {
Label.text = labelText
}
}
StoryBoard Image :
storyboard image
As stated on the comment the problem was that you were using a push segue on a UIViewController.
Please note that push and modal segues are deprecated... Please take a look at this post entry and let me know if you have any doubts
What's the difference between all the Selection Segues?
Make sure to enter some text in your label textField before tapping the button since you are passing that label's text to next scene by using force unwrap.
destViewController.labelText = textField.text! //here compiler expects that your textField has the value
I made a sample project using your same code and didn't get an error. There's nothing wrong with your code.
Try this: Go to your storyboard and check outlets inspector for each view controller and make sure you don't have an outlet to nowhere.
I just going crazy on Swift Popover “return” values. I am new to Objectiv-C as well as SWIFT but I try to focus on SWIFT.
I checked out tutorials around Google and StackOverflow about how to manage iOS popovers, learned a lot but the last peace I couldn’t make it. It is great so see how easy it is made using Swift and Xcode 6, love it, but I could not figure out how to get back the selected value from my popover to my calling view controller.
So here is my problem:
(SIDENOTE: I am using SWIFT and do all using storyboard)
I have created a master ViewController with a button to select currencies. This button opens a “select currency” popover (linked to the CurrencyTableViewController (CTV) by CTRL-Dragging it to the CTV-Controller.
So far so good. The thing is, I have no idea how to get back the selected table row (currency) from the CTV-Table ;-( So I need the selected currency (table row) in the calling ViewController.
This is an excerpt from my ViewController (which is calling the popover)
class ViewController: UIViewController, UIPopoverPresentationControllerDelegate
[...]
// This button is calling the popover
#IBAction func buttonCurrency(sender: AnyObject) {
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if let controller = segue.destinationViewController as? CurrencyTableViewController {
controller.popoverPresentationController?.delegate = self
return
}
}
[...]
Hopefully somebody can help me with that missing last mile how to get back the selected row value back to my ViewController.
Thanks in advance
Cheers
John
I made quick example, hope it helps:
// This is you popover's class
#objc protocol CurrencySelectedDelegate {
func currencySelected(currName: String)
}
class MyPopOverController: UIViewController {
weak var delegate: CurrencySelectedDelegate?
#IBAction func readyButtonPressed(sender: AnyObject) {
// Do what you want
delegate?.currencySelected("Euro/Dollar etc....")
// close popover
}
}
// ViewController
class ViewController: UIViewController, CurrencySelectedDelegate {
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "mySegue" { // your identifier here
let controller = segue.destinationViewController as! MyPopOverController
controller.delegate = self
}
}
}
And remember just declare that currencySelected function in your ViewController.