Pass data back from tableview to viewcontroller textfield Objective - C - ios

Question

I have a UIViewController and a UITableViewController.
In ViewController I have a UIButton and UITextfield, when I press button it will navigate to TableViewController with static data in the tableview like (iPhone 5S, iPhone 6, iPhone 6S, iPhone 7), when I select any of the row it should be displayed in the textfield of ViewController. Tried but cannot get this one. Help me to solve this. below is my code:
ViewController.h
————————————————
#import <UIKit/UIKit.h>
#import "Utility.h"
#interface ViewController : UIViewController
- (IBAction)oneButtonClicked:(id)sender;
#property (strong, nonatomic) IBOutlet UITextField *txtOne;
ViewController.m
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//Can't understand what to do in this viewcontroller.
TableViewController.h
—————————————————————-
#import <UIKit/UIKit.h>
#import "Utility.h"
#interface FamilyDetailsViewController : UITableViewController
#end
TableViewController.m
—————————————————————-
#import "FamilyDetailsViewController.h"
#interface FamilyDetailsViewController ()
{
NSArray *arr;
}
#end
#implementation FamilyDetailsViewController
- (void)viewDidLoad {
[super viewDidLoad];
arr=[[NSArray alloc]initWithObjects:#"Parent",#"Grandparent",#"Sibling",#"Child",#"Other", nil];
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [arr count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cell.textLabel.text=[arr objectAtIndex:indexPath.row];
return cell;
}
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
[self.navigationController popViewControllerAnimated:YES];
}

Answer 1

in `ViewControllerB.h` which is a TableViewController declare a delegate to pass the data to ViewControllerA and create a delegate object
#import <UIKit/UIKit.h>
#protocol DataDelegate <NSObject>
- (void)passData:(NSString *)data;
#end
#interface ViewControllerB : UIViewController
#property (weak, nonatomic) id<DataDelegate> delegate;
#end
in ViewControllerB.m file
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
NSString *selectedText = titleArray[indexPath.row];
if [self.delegate respondsToSelector:#selector(passData:)]) {
[self.delegate passData:"hello"];
}
[self.navigationController popViewControllerAnimated:YES];
}
**in ViewControllerA**
#import "ViewControllerA.h"
#import "ViewControllerB.h"
#interface ViewControllerA () <DataDelegate>
#property (strong, nonatomic) ViewControllerB *viewControllerB;
#end
#implementation ViewControllerA
- (void)viewDidLoad {
_viewControllerB.delegate = self;
}
- (void)passData:(NSString *)data {
self.textField.text = data
}

Answer 2

Try Using NSNotification. Pass data back to ViewController with NSNotification. First register a notification in viewWillAppear of ViewController.
Try below code:
In ViewController:
-(void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:YES];
[[NSNotificationCenter defaultCenter]addObserver:self selector:#selector(getTextFromTable:) name:#"PassTextBackToViewController" object:nil];
}
Then define Method in ViewController like this:
-(void)getTextFromTable:(NSNotification *)notification
{
[self.textField setText:[notification.userInfo valueForKey:#"cellText"]];
}
And in tableView's didSelectRowAtIndexPath method, Post the notification:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell=[tableView cellForRowAtIndexPath:indexPath];
NSDictionary *dictionary=[NSDictionary dictionaryWithObjectsAndKeys:cell.textLabel.text,#"cellText", nil]
[[NSNotificationCenter defaultCenter]postNotificationName:#"PassTextBackToViewController" object:dictionary];
[self.navigationController popViewControllerAnimated:YES];
}
Make Sure, Notification's name must be same in both ViewController and
TableViewController

Answer 3

Follow this:
In AppDelegate.h
#property (strong, nonatomic) NSString *selectedText;
In ViewController.m
-(void)viewWillAppear:(BOOL)animated
{
AppDelegate *appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
txtOne.text = appDelegate.selectedText;
}
Make appDelegate.selectedText = #"" while navigating to UITableViewController Class.
In FamilyDetailsViewController.m
pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
NSString *selected= [arr objectAtIndex:indexPath.row];
AppDelegate *appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
appDelegate.selectedText = selected;
[self.navigationController popViewControllerAnimated:YES];
}
In this way you are storing selected value in Singleton class.(App delegate). You can fetch data from this in ViewController(viewWillAppear).