UITextField loses settings

Question

I am creating a screen "X". Within this screen I'm creating a UITextField and after the change of "TextColor" and "Font" this respective UITextField. However, when I go to the screen "Y" and return to the screen "X" using a modal segue UITextField lose the settings full of "TextColor" and "Font". How can I solve this problem?

Thank you very much!

EditaCanalTVVC.m

BOOL firstTime;

@interface EditaCanalTVVC ()

@property (strong, nonatomic) IBOutlet UIView *viewNumCanal;
@property (strong, nonatomic) IBOutlet UITextField *txtNumCanal;
@property (strong, nonatomic) IBOutlet UILabel *lblNumCanal;
@property (strong, nonatomic) IBOutlet UIView *viewTudo;
@property (strong, nonatomic) IBOutlet UITableView *tableView;
@property (strong, nonatomic) IBOutlet UIBarButtonItem *botaoCancelar;
@property (strong, nonatomic) IBOutlet UIBarButtonItem *botaoOK;

- (IBAction)btnCancelar:(id)sender;
- (IBAction)btnOK:(id)sender;

@end

@implementation EditaCanalTVVC
{
    NSString *strNomeCanal;
    NSString *strNumCanal;
    NSString *strDelay;
}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {

    }
    return self;
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)viewWillAppear:(BOOL)animated
{    
    [self updateScreen];
    [self.tableView reloadData];
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    firstTime = YES;

    [self.txtNumCanal setTextColor: [UIColor darkGrayColor]];
    [self.txtNumCanal setFont:[UIFont fontPrincipal:17]];

    self.tableView.dataSource = self;
    self.tableView.delegate = self;

    [self.navigationController.navigationBar setBackgroundImage:nil forBarMetrics:UIBarMetricsDefault];
    self.tableView.alwaysBounceVertical = NO;

    self.tableView.tableFooterView = [[UIView alloc] initWithFrame:CGRectZero];

    // Initialization code
    UIToolbar* numberToolbar = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320, 50)];
    numberToolbar.barStyle = UIBarStyleBlackOpaque;
    numberToolbar.items = [NSArray arrayWithObjects:
                           [[UIBarButtonItem alloc]initWithTitle:@"Cancelar" style:UIBarButtonItemStyleBordered target:self action:@selector(cancelNumberPad)],
                           [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil],
                           [[UIBarButtonItem alloc]initWithTitle:@"OK" style:UIBarButtonItemStyleDone target:self action:@selector(doneWithNumberPad)],
                           nil];
    [numberToolbar sizeToFit];
    self.txtNumCanal.inputAccessoryView = numberToolbar;

    UITapGestureRecognizer *tapGestureDimmer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(toqueViewNumCanal:)];
    tapGestureDimmer.numberOfTapsRequired = 1;
    [self.viewNumCanal addGestureRecognizer:tapGestureDimmer];


}

- (void)viewDidAppear:(BOOL)animated
{
    [self updateScreen];
}

- (void)viewDidLayoutSubviews
{
    self.viewTudo.backgroundColor = [UIColor corFundoCinza];
    self.navigationController.navigationBar.barTintColor = [UIColor corFundoCinza];

    if ([self.tableView respondsToSelector:@selector(setSeparatorInset:)])
        [self.tableView setSeparatorInset:UIEdgeInsetsZero];

    if ([self.tableView respondsToSelector:@selector(setLayoutMargins:)])
        [self.tableView setLayoutMargins:UIEdgeInsetsZero];

    [self updateScreen];
}

- (void)updateScreen
{    
    self.txtNumCanal.delegate = self;

    if (self.addCanal)
    {
        if (firstTime)
        {
            self.nome_canal = @"Selecione o canal";
            self.delay = @"Selecione o delay";
            self.num_canal = @"Digite o número";
            firstTime = NO;
        }
    }

    self.lblNumCanal.text = @"Número";
    self.lblNumCanal.textColor = [UIColor corLabelClaro];
    self.viewNumCanal.backgroundColor = [UIColor whiteColor];
    self.txtNumCanal.text = [NSString stringWithFormat:@"%@", self.num_canal];
    [self.txtNumCanal setTextColor: [UIColor darkGrayColor]];
    [self.txtNumCanal setFont:[UIFont fontPrincipal:17]];
}

#pragma mark - Toques nas imagens de edição

- (void)toqueViewNumCanal:(UITapGestureRecognizer *)sender
{
    if (sender.state == UIGestureRecognizerStateRecognized)
    {
        [self.txtNumCanal becomeFirstResponder];
    }
}

#pragma mark - Eventos do TextField

-(void)cancelNumberPad
{
    [self.txtNumCanal resignFirstResponder];
    self.txtNumCanal.text = self.num_canal;
}

-(void)doneWithNumberPad
{
    [self.txtNumCanal resignFirstResponder];

    if ([self.txtNumCanal.text isEqualToString:@""])
        self.txtNumCanal.text = self.num_canal;
    else
        self.num_canal = self.txtNumCanal.text;

    [self updateScreen];
}

#pragma mark - Eventos da Tabela

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return 2;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier1 = @"CellCanal";
    static NSString *CellIdentifier3 = @"CellDelay";

    UITableViewCell *cell1 = [tableView dequeueReusableCellWithIdentifier:CellIdentifier1];
    UITableViewCell *cell3 = [tableView dequeueReusableCellWithIdentifier:CellIdentifier3];

    int isCellCustom = 0;

    if (!cell1)
        cell1 = [[UITableViewCell alloc] initWithStyle: UITableViewCellStyleDefault reuseIdentifier: CellIdentifier1];

    if (!cell3)
        cell3 = [[UITableViewCell alloc] initWithStyle: UITableViewCellStyleDefault reuseIdentifier: CellIdentifier3];

    switch (indexPath.row)
    {
        case 0:
        {
            isCellCustom = 1;
            cell1.textLabel.text = @"Canal";
            cell1.detailTextLabel.text = [NSString stringWithFormat:@"%@", self.nome_canal];
            cell1.detailTextLabel.textColor = [UIColor darkGrayColor];

        }   break;

        case 1:
        {
            isCellCustom = 2;
            cell3.textLabel.text = @"Delay";
            cell3.detailTextLabel.text = [NSString stringWithFormat:@"%@", self.delay];
            cell3.detailTextLabel.textColor = [UIColor darkGrayColor];

        }   break;
    }

    cell1.textLabel.textColor = [UIColor corLabelClaro];
    [cell1 setBackgroundColor:[UIColor whiteColor]];

    cell3.textLabel.textColor = [UIColor corLabelClaro];
    [cell3 setBackgroundColor:[UIColor whiteColor]];

    if (isCellCustom == 1)
        return cell1;
    else
        return cell3;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    switch (indexPath.row)
    {
        case 0:
        {
//            [self performSegueWithIdentifier:@"segueListaCanaisTV" sender:nil];

            UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
            ListaCanaisTVVC *lista = [storyboard instantiateViewControllerWithIdentifier:@"listaCanaisTV"];

            lista.tipoDaLista = 1;

            [self presentViewController:lista animated:YES completion:nil];

        } break;

        case 1:
        {


        } break;

        default:
            break;
    }

    [tableView deselectRowAtIndexPath:indexPath animated:YES];
}


- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return YES;
}

#pragma mark - Botões

- (IBAction)btnCancelar:(id)sender
{
    [self.navigationController popViewControllerAnimated:YES];
}

- (IBAction)btnOK:(id)sender
{
    [self.navigationController popViewControllerAnimated:YES];
}

#pragma mark - UIStoryBoardSegue

//- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
//{    
//    if ([segue.identifier isEqualToString:@"segueListaCanaisTV"])
//    {
//        ListaCanaisTVVC *list = (ListaCanaisTVVC *)segue.destinationViewController;
//        
//        list.tipoDaLista = 1;
//        
//    }    
//}

@end

EditaCanalTVVC.h

#import <UIKit/UIKit.h>

@interface EditaCanalTVVC : UIViewController <UITableViewDelegate, UITableViewDataSource, UITextFieldDelegate>

@property (nonatomic) int id_canal_local;
@property (nonatomic) int id_canal_tv;
@property (nonatomic) NSString *nome_canal;
@property (nonatomic) NSString *num_canal;
@property (nonatomic) NSString *delay;

@property (nonatomic) int id_dispositivo;

@property (nonatomic) BOOL addCanal;
@property (nonatomic) BOOL canalSelecionado;

- (void)updateScreen;

@end

Answer 1

Try to remove the self performSegue in your .m file and manage it via storyBoard instead.

To do so, select your button and in the Connection Inspector (the arrow in a circle) define your segue via the Triggered Segue part: drop the point on the Y viewController and define it as "Present modally" (as "Modal" is deprecated).

When you'll use the button, the Y viewController will show up, you don't need to code a single line for that.

I also tried to do it your way, with coded segue, but i can't reproduce the bug (event with sender:selfon performSegue).

Answer 2

Ok, so if you need to send variables as parameter, why don't you try this:

- (IBAction)didTapButton:(UIButton *)sender{
    SecondView *secondView = [[SecondView alloc] initWithNibName:@"SecondView" bundle:nil];
    secondView.someProperty = @"someValue";
    [self presentViewController:secondView animated:YES completion:nil];
}

Put that code in your first view and link this to the button you have. This way you can send whatever you want to your second class, and you avoid using performSegue since you have issues with it.

If you're using storyboard, do this to get the secondView:

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
SecondView *secondView = [storyboard instantiateViewControllerWithIdentifier:@"ViewController"];

Then to come back to the first view, put that code in the second view:

[self dismissViewControllerAnimated:YES completion:nil];