Question

I have two views and two classes. On the first view, controlled by the first class I have a textfield and a button. On the second view controlled by the second class I have two labels. I tried to make one label receive the value I put on the text field, and the other label this value divided by 100. But on both cases I get 0.00, I don’t know why!

firstclass.h

#import <UIKit/UIKit.h>

@interface NotasViewController : UIViewController{

}

-(IBAction)calcular:(id)sender;
-(IBAction)clicarFora:(id)sender;
-(IBAction)recuarTeclado:(id)sender;
@property (strong, nonatomic) IBOutlet UITextField *inserirTF;


@end

fisrtclass.m

#import "NotasViewController.h"
#import "resultadoViewController.h"

@interface NotasViewController ()

@end

@implementation NotasViewController
@synthesize inserirTF;

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

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

-(IBAction)calcular:(id)sender{

    float valor = [inserirTF.text floatValue];
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
    resultadoViewController *second = [storyboard instantiateViewControllerWithIdentifier:@"resultado"];
    second.resultadoFloatValor = valor;
    NSLog(@"%.2f", second.resultadoFloatValor);
}

-(IBAction)recuarTeclado:(id)sender{

    [sender resignFirstResponder];

}

-(IBAction)clicarFora:(id)sender{

    [inserirTF resignFirstResponder];

}

@end

secondclass.h

#import <UIKit/UIKit.h>

@interface resultadoViewController : UIViewController{

    float resultadoFloatValor;

}

@property float resultadoFloatValor;
@property (strong, nonatomic) IBOutlet UILabel *resultadoLabelValor;
@property (strong, nonatomic) IBOutlet UILabel *resultadoLabelQtd100;

@end

secondclass.m

#import "resultadoViewController.h"

@interface resultadoViewController ()

@end

@implementation resultadoViewController
@synthesize resultadoFloatValor, resultadoLabelValor, resultadoLabelQtd100;

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

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    NSString *resultadoStringValor = [[NSString alloc] initWithFormat:@"%.2f", resultadoFloatValor];
    NSLog(@"%.2f", resultadoFloatValor);
    NSLog(@"%@", resultadoStringValor);
    resultadoLabelValor.text = resultadoStringValor;

    int resultadoIntResto100 = resultadoFloatValor/100;

    if (resultadoIntResto100 > 0) {

        NSString *resultadoStringQtd100 = [[NSString alloc] initWithFormat:@"%i", resultadoIntResto100];
        resultadoLabelQtd100.text = resultadoStringQtd100;

    }

}

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

@end

You’ll see 3 NSLogs on my code. For testing, I put 54 on my textfield. The Output was like this:

2013-01-12 21:15:27.020 Divisorreal[21843:c07] 54.00
2013-01-12 21:15:27.023 Divisorreal[21843:c07] 0.00
2013-01-12 21:15:27.023 Divisorreal[21843:c07] 0.00

PS: All my Outlets are correctly connected to the UILabels.

Answer 1

Best guess:

It looks like you are setting resultadoFloatValor after viewDidLoad is called.

Implement prepareForSegue: and set the value there.