Setting text from label as an integer

dkun7944 · January 2012

Hello. I am very new to iPhone development so please excuse me if I don't use correct terminology. I am creating one of my first apps. It is a basic counter that increases or decreases the number on a label when you press the increase or decrease buttons. There is also a text field and a button that when pressed, changes the label to the text in the text field. But after the text field text is changed, when the increase button is pressed, the number doesn't increase from the number I entered in the text field. It increases from the number it last left off on. I want the number to increase from the number I entered in the text field. I know it sounds confusing but please try to help me. Here is some of my code from the h file:

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController {
    IBOutlet UILabel * label;
    IBOutlet UITextField * textField;
    int inum;
    } 
- (IBAction)increasebuttonPress:(id)sender;
- (IBAction)decreasebuttonPress:(id)sender;
- (IBAction)settextbuttonPress:(id)sender;

@end

and from the m file:

#import \"ViewController.h\"

@implementation ViewController

- (IBAction)increasebuttonPress:(id)sender; {
    inum = inum + 1;
    [label setText:[NSString stringWithFormat:@\"%d\", inum]];
}
- (IBAction)decreasebuttonPress:(id)sender; {
    inum = inum - 1;
    [label setText:[NSString stringWithFormat:@\"%d\", inum]];
}
- (IBAction)settextbuttonPress:(id)sender; {
    if ([[textField text] floatValue] < 0) {
        UIAlertView *message = [[UIAlertView alloc] initWithTitle:@\"Error\"
                                                          message:@\"You can only enter a number greater than 0.\"
                                                         delegate:nil
                                                cancelButtonTitle:@\"OK\"
                                                otherButtonTitles:nil];
        [message show];
    }
    else
    {
        [label setText:[textField text]];
    }
}

Duncan C · January 2012

dkun7944;404696 said:

Hello. I am very new to iPhone development so please excuse me if I don't use correct terminology. I am creating one of my first apps. It is a basic counter that increases or decreases the number on a label when you press the increase or decrease buttons. There is also a text field and a button that when pressed, changes the label to the text in the text field. But after the text field text is changed, when the increase button is pressed, the number doesn't increase from the number I entered in the text field. It increases from the number it last left off on. I want the number to increase from the number I entered in the text field. I know it sounds confusing but please try to help me. Here is some of my code from the h file:

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController {
    IBOutlet UILabel * label;
    IBOutlet UITextField * textField;
    int inum;
    } 
- (IBAction)increasebuttonPress:(id)sender;
- (IBAction)decreasebuttonPress:(id)sender;
- (IBAction)settextbuttonPress:(id)sender;

@end

and from the m file:

#import \"ViewController.h\"

@implementation ViewController

- (IBAction)increasebuttonPress:(id)sender; {
    inum = inum + 1;
    [label setText:[NSString stringWithFormat:@\"%d\", inum]];
}
- (IBAction)decreasebuttonPress:(id)sender; {
    inum = inum - 1;
    [label setText:[NSString stringWithFormat:@\"%d\", inum]];
}
- (IBAction)settextbuttonPress:(id)sender; {
    if ([[textField text] [COLOR=\"red\"][B]intValue[/B][/COLOR]] [COLOR=\"red\"][B]<=[/B][/COLOR] 0) {
        UIAlertView *message = [[UIAlertView alloc] initWithTitle:@\"Error\"
                                                          message:@\"You can only enter a number greater than 0.\"
                                                         delegate:nil
                                                cancelButtonTitle:@\"OK\"
                                                otherButtonTitles:nil];
        [message show];
    }
    else
    {
        [label setText:[textField text]];
        [COLOR=\"Red\"]iNum = [[textField text] intValue];[/COLOR]
    }
}

A couple of things. If you want to require the user to enter a value greater than zero, you should reject anything <= 0, not just <0. Your code as written will allow zero values.<br />
Since your value is an integer, you should probably take the intValue of the text field rather than the float value.

Next, take the textField text and assign it's int value to iNum (changes shown in red)

dkun7944 · January 2012

Thanks a lot. That worked. Also, is there any way to detect if the text you entered in the text field is a number or a letter?

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Setting text from label as an integer

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