I want to save the inputed data from 3 textfields. I think I will store them in a CSV-file. The problem is that I want to display it in another viewController. or can I do it in a single view controller?
the user will type in their infon in the view controller1, then there is a called "Den här texten kommer att sparas" will show a NSString with all the information that is typed in, and that is what I want to store and show in some kind of list/table in the second view controller.
My question is: How can I access the NSString from the left viewController? Or is there an easier way to solve this problem, e.g. in a single view controller?
If you are changing the ViewController using a storyboard segue, the easiest way would be to pass it using the -prepareForSeguemethod. You have to set the segue identifier in the storyboard, select the segue and set your identifier text in the attributes inspector.
You will need to create propertys in your destination ViewController for the objects you want to pass.
Add this to your destinationViewController.h
#property (nonatomic, strong) NSString *tf1String;
#property (nonatomic, strong) NSString *tf2String;
#property (nonatomic, strong) NSString *tf3String;
Then import the destinationViewController.h file in your firstViewController.hfile.
#import "destinationViewController.h"
Then add the following method to your firstViewController.mfile
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([[segue identifier] isEqualToString:#"YOUR_SEGUE_IDENTIFIER"]) {
DestinationViewController *destinationVC = [segue destinationViewController];
destinationVC.tf1String = [yourTextField1 text];
destinationVC.tf2String = [yourTextField2 text];
destinationVC.tf3String = [yourTextField3 text];
}
}
You may have to change some variables names in order to get this code working.
Related
So ultra NOOB when it comes to iPhone development
I have three view controllers for a Tab Bar Controller.
What I want here is when I press a button the data from TextFields in the first view get fetched and displayed.
In my firstViewController.h I have declared the TextFields like this:
IBOutlet UITextField * driver;
IBOutlet UITextField * phone;
IBOutlet UITextField * poe;
IBOutlet UITextField * doe;
IBOutlet UITextField * coe;
IBOutlet UITextField * dod;
IBOutlet UITextField * customer;
IBOutlet UITextField * customerContact;
IBOutlet UITextField * customerTank;
IBOutlet UITextField * trailer;
IBOutlet UITextField * truck;
Then in my Main.storyboard I have connected the outlets to each TextField
Now I thought that it just was to import the firstViewController.h to my thirdViewController.h using the #import "" and somehow check when button click was trigged. But it does not seems to be that easy in terms of NOOBines.
I thought that doing something like this in the thirdViewController.h could make the magic:
#import <UIKit/UIKit.h>
#import "FirstViewController.h"
#interface ThirdViewController : UIViewController{
NSString *theDriver = [driver.text];
}
#end
unfortunately it isnt that easy. assuming there is a secondViewController in between your first and third, you're going to pass variables through during the segue using this method. define some variables in the .h file of your second view controller like driver, phone, etc. and assign those values from what you have right there
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"the name of your segue"]) {
secondViewController *secondVC = segue.destinationViewController;
secondVC.driver = self.driver.text;
secondVC.phone = self.phone.text;
//continue typing your values and use this to carry this same method in your secondViewController to carry them into your thirdViewController
}
EDIT 1:
Here is an example I used in an app of mine where I am looking at a list of games and I want to look at one individual game. This is the code in the MatchesViewController.m file. I have my gameObject (in your case the gameObject would be text) and I want to send it to the next view controller. I have also have this imported in the "MatchesViewController.m"
#import "EachMatchViewController.h"
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"showOneGame"]) {
EachMatchViewController *eachVC = segue.destinationViewController;
eachVC.gameObject = self.gameObject;
}
}
This is what is defined in my "EachMatchViewController.h" which is the view controller I am going to.
#property (strong, nonatomic) PFObject *gameObject;
some in my "EachMatchViewController.m" I can use it the data that is being passed over.
I am making an iOS app that uses payment methods.
At the moment I am trying to work on the checkout flow, which contains an OderFormViewController and a CheckoutTableViewController as you can see below:
I connected both by dragging a segue, as highlighted in blue. I also added a segue identifier for my segue.
I called the first view controller as E_OrderFormViewController(Its title is Shipping Address), and in it I created an IBActionfor my Continue button and also used -(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender to pass in the information.
I also have an Order model, with some properties in it. On my CheckoutTableViewController, I have got my labels and orderInfo as public properties, so the first view controller one can access it.
#import <Foundation/Foundation.h>
#interface Order : NSObject
#property(strong, nonatomic) NSString *shippingName;
#property (strong, nonatomic) NSString *shippingAddress;
#property (strong, nonatomic) NSString *shippingCity;
#property(strong, nonatomic) NSString *shippingState;
#property(strong, nonatomic) NSString *shippingZip;
#end
//E_OrderFormViewController.m
#import "E_OrderFormViewController.h"
#import "F_CheckoutTableViewController.h"
...
#pragma mark - My Actions
- (IBAction)storePaymentInfoProceedToConfirmation:(id)sender {
[self performSegueWithIdentifier:#"toCheckout" sender:self];
}
#pragma mark - Navigation
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
if ([[segue identifier] isEqualToString:#"toCheckout"]) {
F_CheckoutTableViewController *checkoutView = segue.destinationViewController;
//Store Information and pass it to next view
checkoutView.orderInfo.shippingName = self.txtFieldNameOnCard.text;
NSLog(#"Shipping Name Stored: %#",checkoutView.orderInfo.shippingName);
}
}
My NSLog always returns (null) for whatever text I type inside my first textField, which is the one I am testing first.
Here is my CheckoutTableViewController, with its public property. The orderInfois listed here. I am using it to pass in the information, as I mentioned above:
//F_CheckoutTableViewController.h
#import <UIKit/UIKit.h>
#interface F_CheckoutTableViewController : UITableViewController
#property (strong, nonatomic)Order *orderInfo;
#end
On my viewDidLoad, on my destination view controller, I did:
//F_CheckoutTableViewController.m
#implementation F_CheckoutTableViewController
- (void)viewDidLoad {
[super viewDidLoad];
//Load all information
self.labelShippingName.text = self.orderInfo.shippingName;
NSLog(#"Typed Name: %#",self.orderInfo.shippingName);
}
I just pasted the viewDidLoad as a reference, as I am aware if my NSLog in my prepareForSegue is not returning anything, the information is not being passed.
I really don't know where the error is. I searched in a couple of threads here on StackOverFlow, and none of them helped me, one which seems to be similar, is this one, but it didn't help with my issue:
Multiple segues not passing Object data between themselves
This seems to be pretty simple, but I am making some mistake that I can not find.
I really appreciate your help.
orderInfo must be null, because you didn't initialize it, therfore you cannot set its properties... so you got 2 options:
checkoutView.orderInfo = [[OrderInfo alloc]init];
checkoutView.orderInfo.shippingName = self.txtFieldNameOnCard.text;
or change your property from:
#property (strong, nonatomic)Order *orderInfo;
to:
#property (strong, nonatomic)NSString *shippingName ;
Based on the storyboard set up, you are using Textfield in Shipping Address View Controller, it may miss the delegation of Textfield to its controller.
I have four viewControllers in my current design and I am designing an app to sell a product.
FirstViewController gets the product image and when user clicks to the next button then it takes user to the secondviewcontroller where user describes the product and then user clicks next button which takes user to the thirdViewcontroller where price and condition are entered. In the lastviewcontolller there is a post button to send the product info to the server. I am using POST method.
The following segue approach does not fit into what I want, because it sends the firstviewcontroller object (product image) to the secondviewcontoller, and then secondviewcontroller also should forward the product image to the thirdviewcontoller and so on. I do not think it is a feasible way of doing it.
I wonder what is the best way of collection information from the first page till to the last page and send it. What is best way of handling that issue? I am using segue between the viewcontrollers.
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Make sure your segue name in storyboard is the same as this line
if ([[segue identifier] isEqualToString:#"isSecond"])
{
// Get reference to the destination view controller
SecondViewController *vc = [segue destinationViewController];
// Pass any objects to the view controller here, like...
[vc setMyProductImage:productImage];
}
}
Please don't use a singleton, even if the majority of users here tells you so. It would violate the SOLID-Principles for several reasons.
Instead just pass the object from ViewController to ViewController.
If all ViewController expect the same model class, you can create a common base class that has the property for the model.
it could have this method
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.destinationViewControler isKindOfClass:[ProductAwareBaseViewController class]])
{
ProductAwareBaseViewController *vc = (ProductAwareBaseViewController *)segue.destinationViewControler;
vc.product = self.product;
}
}
I created an example project: https://github.com/vikingosegundo/ProductWizard
Note, that all view controller derive from ProductAwareBaseViewController
#import UIKit;
#class Product;
#interface ProductAwareBaseViewController : UIViewController
#property (nonatomic, strong) Product *product;
#end
#import "ProductAwareBaseViewController.h"
#import "Product.h"
#interface ProductAwareBaseViewController ()
#end
#implementation ProductAwareBaseViewController
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.destinationViewController isKindOfClass:[ProductAwareBaseViewController class]]) {
ProductAwareBaseViewController *vc = (ProductAwareBaseViewController *)segue.destinationViewController;
vc.product = self.product;
}
}
#end
This ViewController knows how to pass the model data of class Product to other instances of ProductAwareBaseViewController and subclasses of it.
All other view controller don't deal with passing the data, just adding each portion of data (name, description, price) to the model and displaying it.
i.e:
#import "EditNameProductViewController.h"
#import "Product.h"
#interface EditNameProductViewController ()
#property (weak, nonatomic) IBOutlet UITextField *nameField;
#end
#implementation EditNameProductViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.product = [[Product alloc] init];
}
- (IBAction)continueTapped:(id)sender {
self.product.productName = self.nameField.text;
}
#end
#import "EditDescriptionProductViewController.h"
#import "Product.h"
#interface EditDescriptionProductViewController ()
#property (weak, nonatomic) IBOutlet UITextField *descriptionField;
#property (weak, nonatomic) IBOutlet UILabel *nameLabel;
#end
#implementation EditDescriptionProductViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.nameLabel.text = self.product.productName;
}
- (IBAction)continueTapped:(id)sender {
self.product.productDescription = self.descriptionField.text;
}
#end
Create an object to act as your application's data model. It can be a singleton or it can be a normal object that's available from a known location...such as owned by the app delegate.
Update your model when you have new information and read from the model when you need to display something. Using prepareForSegue: and linking controllers may be acceptable for simple things but it really doesn't scale well.
One way of doing this would be that you create a mutable dictionary (or a custom object with variables) in the first view controller. Then you would pass a weak reference to second/third/fourth view controllers of the mutable dictionary/object from first view controller. Each view controller would be able to set data to the dictionary/object and the last one would be able to process the information.
Another way would be to create a simple singleton class with variables that you want to store. The first view controller would reset the singleton variables. Then let each view controller access the singleton and store their values there, last view controller would process values from singleton.
It depends how many data you are collecting and what you personally prefer.
I have a prepareForSegue method setup in that sends everything I want to the destinationViewController except the value for a UILabel on the destinationVC. I threw a NSLog statement in to see what value it prints and it prints what I want.
It doesn't crash, but it doesn't set. I know I'm missing something very basic here, but it's not jumping out at me.
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(UIButton *)sender {
if ([[segue identifier] isEqualToString:#"directionsSegue"]) {
// Set destination view controller
DirectionsViewController *destinationVC = segue.destinationViewController;
// Pick out the "thing" you want to send to destinationVC
CGPoint point = [sender convertPoint:CGPointZero toView:self.tableView];
NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:point];
// Set the "thing" on the destinationVC
PointOfInterest *poi = [self.fetchedResultsController objectAtIndexPath:indexPath];
destinationVC.destinationLabel.text = poi.name;
NSLog(#"destinationVC.destinationLabel.text = %#", poi.name);
destinationVC.destinationLatitude = poi.latitude;
destinationVC.destinationLongitude = poi.longitude;
}
}
My property declared in the header of my destinationVC:
#property (strong, nonatomic) IBOutlet UILabel *destinationLabel;
Solution from answers below:
Mystery solved! Here's what I did:
on my destinationVC, I added this to my header:
#property (nonatomic, strong) NSString *destinationName;
I put this back in the implementation:
#property (strong, nonatomic) IBOutlet UILabel *destinationLabel;
In destinationVC, I added this to my viewDidLoad:
self.destinationLabel.text = self.destinationName;
Your label will be nil in prepareForSegue because it won't be instantiate at this time. In fact, IBOutlet are initialised yet once your view is loaded. That's why it's not working.
The best way to solve your issue is to create another property in your DirectionsViewController where will be stored your text. This one is available directly after your controller initialisation, and then you can set your label directly wherever in your controller.
IBOutlet objects are not initialized until the view controller's view loads. That happens after the segue. Create a custom property and update that during prepare and then copy it to your label during viewDidLoad.
I created a Master/Detail application with xCode and changed very little about it. In prepareForSegue in the MasterViewController, I added this to try to put some text in a label in the detail view controller
MMDetailViewController *detailVC = [segue destinationViewController];
detailVC.testdetail.text = #"test";
I also added a label to the detailViewController on the storyboard and then did control/drag to the detailViewController to connect them.
#property (strong, nonatomic) IBOutlet UILabel *testdetail;
Therefore, when I set the text in prepareForSegue, I expected it to show in the label once I ran the code on the simulator. However, it didn't show. Can you explain why?
Its because you can't update the UILabel before it load...
So what you need to do is this:
Make Nsstring and update it value, then in viewDidLoad update your Label.
In your detailViewController.h add
#property (strong, nonatomic)NSString *testString;
Then in the detailViewController.m in viewDidLoad:
- (void)viewDidLoad
{
[super viewDidLoad];
self.testdetail.text = testString;
}
in your masterViewController:
MMDetailViewController *detailVC = [segue destinationViewController];
detailVC.testString = #"test";
That's it, it should work now :)
Happy coding
The outlets are accessible after -viewDidLoad is fired. That didn't happen yet in -prepareForSegue:, so you probably access a label with nil value.
Ensure that detailVC.testdetail is not nil in -prepareForSegue: first.
If it's nil, which I assume, the UILabel isn't loaded yet. See IBOutlet properties does not update when using prepareForSegue method
Instead, use a NSString property to pass the value around. Put the value into the label in -viewDidLoad of your destination MMDetailViewController because it's responsible for doing that itself.