In the initial set up of my app I need the user to chose a genre type. i have it set up such that the user selects from a list of UIButtons which are all different genre types. I need this genre selection to save to the users profile. The next view controller is the same set up as the genreVC but asking for instrument instead of genre. The next segue from here is to view controller 3 the usersVC profile and it should have saved which two buttons were selected on the previous two VC's by updating a label. I have tagged each button with a number and have tried next to everything.
How do I save which button has been pressed on a different view controller to the users profile and update the label on the users profile to the name of the button pressed?
I am using each button individually and have them tagged as such as seen here:
#IBAction func popGenreButton(sender: UIButton) {
if(sender.tag == 6){
print("Pop genre selected")
}
}
#IBAction func altGenreButton(sender: UIButton) {
if(sender.tag == 7){
print("Alternative genre selected")
}
}
#IBAction func electronicGenreButton(sender: UIButton) {
if(sender.tag == 8){
print("Electronic genre selected")
}
}
I also tried adding each button into genreSelection as shown below that didn't work so I stuck with the individual buttons above.
#IBAction func genreSelectionButton(sender: UIButton) {
print(sender.titleLabel!.text!)
genreResult.text = genreString + " genre has been saved to your profile"
}
I also created a nib with myModalDelegate and protocol and nope.
I thought maybe I could create a genre array and when a certain button is selected it calls a certain item from the array and updates that item to the label but I was unsure how to go about this too.
I am using Xcode 7 and Swift 2.0 and Parse as my cloud server.
As you can see I have a lot to learn yet with Swift. I have been searching how to do this for the past week and can't figure it out. I am a 'lot' out of my depth but want to figure it out, if anyone can help that would be great!
A simple solution would be something like creating a global store for those values
i.e.
struct Choices {
static var genre: String?
static var instruments: String?
}
then you could in your different view controllers write and read from it by simply
Choices.instrument = "trumpet"
or
label.text = Choices.genre
A prettier solution would be to create a similar class as the previous struct but not have the variables static. You could then pass it along and fill up with the values from each VC and use the values in the last VC where you are setting the label text
Related
I'm building an app which which has built in with 2 different tabs. First tab is is "Home" which basically has a tableview with cells that configured from an api.(The api gets me country names for now)
Those cells also have a "Star" button which prints the data of the specific cell for now.
Second tab is "Saved" tab(SavedViewController), where I want to show the "starred" countries, using a tableview.
You can see the image below in order to get an idea for the app.
App simulation Image
The star button has a function in my CountriesTableViewCell. I'm using a saveButtonDelegate in order to let the SavedViewController know about an item is going to be saved. The code in CountriesTableViewCell for star button is as below.
#objc func buttonTapped() {
//If Button is selected fill the image. Else unfill it.
if !isSaveButtonSelected {
saveButton.setImage(UIImage(systemName: "star.fill"), for: .normal)
isSaveButtonSelected = true
saveButtonDelegate?.saveButtonClicked(with: countryData) //Checking if save button is clicked
}
}
countryData is the data that I get from the api, and this is the data I want to pass to SavedViewController.
struct CountryData: Codable {
let name : String
}
So on the SavedViewController, I'm handling the data using the SaveButtonProtocol conformance as below:
extension SavedViewController: SaveButtonProtocol {
func saveButtonClicked(with data: CountryData) {
countryDataArray.append(data)
print("saveButtonClicked")
print("countryData in savevc is \(countryDataArray)")
DispatchQueue.main.async {
self.countriesTableView.reloadData()
}
}
}
Whenever I click the star button on the first tab, this function is getting called on SavedViewController. So whenever I click to button, those print statements above work fine.
The problem is, whenever the star button is clicked, it should append the data of the current clicked cell to countryDataArray in SavedViewController. But the array is not populating as it should.
Let's say I pressed the first cell's star button, my print("countryData in savevc is (countryDataArray)") statement prints : ["Vatican City"], then I press the second cell's star button it only prints ["Ethiopia"] while it should print ["Vatican City", "Ethiopia"]
Why this issue is happening? My best guess is I'm delegating SavedViewController from the cell class so it behaves differently for every other cell. If that is the problem what should I do to solve it?
Many Thanks.
You should store your data in a shared (static array) object so you only have one source and add the saved indicator in your country struct so you do not rely on what is displayed in one view controller.
This question already has answers here:
Passing data between view controllers
(45 answers)
Closed 3 years ago.
I am currently working on an app and have problems with posting events.
I collect data in a sequence of several views (7 screens) and would like to store the data finally at once (or show all the data in the final view).
These data are, for example, location info, user info, event image, comments, event category, ...
I know how to store the data in the database/storage (firebase) if I collect the data in one or two views.
But in my use case I have seven views and I could not find any elegant method.
What's the best way to do that with Xcode 10?
You can use struct as below code. Make all required variable for all screen in this struct (like string, image etc..). And you can access this from any ViewController.
struct InputDetails {
static var details: InputDetails = InputDetails()
var city: String = ""
var lat: String = ""
var long: String = ""
}
Now to add value in this
InputDetails.details.city = textfiels.text
Now to access first screen value in last screen
print(InputDetails.details.city)
And once your API call or above struct usage is over, make sure to reset all details like below.
InputDetails.details = InputDetails()
There are several ways for passing data between View Controllers. For example you could use an instance property or a segue or the delegation method.
I recommend you study this article which paints a complete picture of the different methods and how to apply them:
How To: Pass Data Between View Controllers In Swift
Edit:
Upon examining the picture in your question I figured that using a segue would be the most appropriate solution here. As it seems from the picture you enter data in one View Controller, pass that onto the second View Controller and finally you upload all the data to Firebase.
I assume that you use storyboards (if not then consult the link above for other methods.) In this example below you will pass a string from one VC to another.
Step 1:
Add a segue between two view controllers. Storyboard -> press ctrl and click on VC one and drag your mouse -> you will see a blue arrow, drag that to VC two and release -> select manual segue: show -> click on the segue and give it an identifier
Step 2:
In VC two, make a string variable:
class SecondViewController: UIViewController {
var stringToPass: String = ""
override func viewDidLoad() {
super.viewDidLoad()
print(stringToPass)
}
Step 3:
In VC one, enter the following:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let vc = segue.destination as? SecondViewController {
vc.stringToPass = "This is the string we pass between two VC"
}
}
Step 4:
Then whenever you want to go to the SecondViewController perform the segue like this:
performSegue(withIdentifier: "identifierYouEntered", sender: self)
Initially I had two buttons with titles: "+" and "-". Both buttons are located in table cell. I have used protocol and delegate to pass value from button title to function call which depends on input params. If input parameter is "-" - decrease value, if "+" - increase.
But later I removed titles and replaced buttons with respective images. And here I faced an issue - I cannot call function properly because title is blank.
I have implemented the following workaround. I have set Accessibility Identifier for both buttons. For example for +:
And in cell class I used accessibilityIdentifier:
#IBAction func didPressOrderCellButton(_ sender: UIButton) {
cellDelegate?.didPressOrderCellButton(order: order!, menuItem: menuItem!, action: sender.accessibilityIdentifier!)
}
But... I have some doubts if it's proper way to do this. Will it create any issues in future if I decide to work with accessibility feature?
I do not want to use title and add code to ViewController class to hide it every time view is loaded or appeared. I want to avoid such solutions in my code because it's too difficult to support such solutions I believe.
I have tried to find another button identifier that I can use, but didn't succeed.
The simple approach would be just set the tag value inside your button and then check the same tag value and perform your operation Plus or Minus accordingly.
For instance:-
if sender.tag == 0 {
//Do minus
} else if sender.tag == 1 {
//Do plus
}
I am currently working on an iOS application (Swift) in Xcode for my work study position at school. To highlight the background of the portion mentioned in this question: The user goes through a series of pages to basically grade the student on their performance through nursing simulations. I need there to be an extra tab where the user can verify the grading that has been entered just simply by showing the number of things they selected that were done in the scenario.
Basically I have a tabbed view controller with three tabs. The first tab has switches the user can turn on or off to add or subtract to a variable, "WASH". The second tab is the same but it adds/subtracts to a variable, "ID". The third tab is to confirm the values. So if the student does 2/3 for Washing their hands and 4/5 of checking the patient's ID, it should be viewed here.
here is basically the code I have for every switch
#IBOutlet weak var IDTOTAL: UILabel!
#IBOutlet weak var CHECKID1: UISwitch!
#IBAction func ID1(_ sender: UISwitch) {
if(CHECKID1.isOn) {
ID = ID + 1
total = total + 1
IDTOTAL.text = String(ID)
}
else {
ID = ID - 1
total = total - 1
IDTOTAL.text = String(ID)
}
}
Please note that the variables ID and total are global variables. Currently, IDTOTAL is on the same view controller as the switch and this works fine. I tried to add another label on the confirm view controller called "IDTOTAL2" and tried setting it to a value with "IDTOTAL2.text = String(ID)" but this throws an error.
How do I go about making the label on the last page update its value without requiring the user to push a button to initiate an action?
EDIT: Please refer to this picture to see the error I am getting.
You can update your labels in the viewDidAppear function of your third tab, since it gets triggered every time you switch from another tab to this one. Simply add:
override func viewDidAppear(_ animated: Bool) {
//update your labels here
}
I am coding a program which its home has 6 buttons
if you press a button, it shows a TableView when a row is pressed, it shows new viewconroller which show Row Data Details
the TableView takes its data from JSON URL and this JSON URL has all data on it (6 section).
button(X) to show Section(X)Data
[X=1; X=<6]
i coded it with a long way: every button(X) leads to [Button(X)ViewContoller] and every has [Button(X)TableViewCell]
[X=1; X=<6]
so i have 6 ViewContoller and 6 TableViewCell file.
i think about make an If statement for the 6 buttons instead of separated 2 file for every button, so that what i mean:
if button(X) is pressed,it will show Section(X)Data in the TableView
[[X=1; X=<6]]
i tried to do it a lot, but no way
can any one help me on If statement coding?
You just have to:
Set different tags for the buttons
"Plug" all the buttons in the same method
Check which button was clicked and change set your model accordingly
Tip: You can access properties of your destination view controller using the segue.destinationViewController property inside the prepareForSegue(segue: sender:) method.
EDIT: For example:
Create var buttonTag : Int?
Create a method like #IBAction func clicked(sender: UIButton) {
self.buttonTag = sender.tag
}
Pass it on the way you think is betteroverride func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
segue.destinationViewController?.buttonTag = self.buttonTag
}
Do whatever you have to do with data in your destination view controller