Question

i’ve been doing a thing here using objective-c, but i’m a beginner in this language, and that’s what i did:

there is a class, named “firstviewclass”, that is in the control of my first view, in this view there is a textfield that the user puts a number. the textfield is in the firstviewclass.h named “setNumber”. There is another class, named “secondviewclass” that is in control of the second view, in this view there is a label that is in the secondviewclass.h, and i want that this label recive the value that the user put in the textfield from the first view. my codes:

firstviewclass.h:

#import <UIKit/UIKit.h>

@interface firstviewclass : UIViewController

@property (strong, nonatomic) IBOutlet UITextField *setNumber;

- (IBAction)gotonextview:(id)sender;

 @end

secondviewclass.h:

#import <UIKit/UIKit.h>
#import "firstviewclass.h"

@interface secondviewclass : UIViewController

@property (weak, nonatomic) IBOutlet UILabel *labelthatrecivesthetextfieldvalue;

@end

secondviewclass.m:

#import "secondviewclass.h"
#import "firstviewclass.h"

@implementation secondviewclass
@synthesize labelthatrecivesthetextfieldvalue;


-(void)viewDidLoad{
    [super viewDidLoad];

    firstviewclass *object = [[firstviewclass alloc] init];

    NSString *string = [[NSString alloc] initWithFormat:@"%i", [object.setNumber.text intValue]];

    labelthatrecivesthetextfieldvalue = string; //here is where that error appears "incompatible pointer types assigning to 'UILabel *__weak' to 'NSString *__strong'"

}

@end

I’ve changed what you had told me to change, but when i test it on the simulator any number that i put in the textfield it appears in the label as 0… i really don’t know what to do!

Answer 1

It should be:

labelthatrecivesthetextfieldvalue.text = string;

---

Under the hood:

After your xib instantiated an UILabel and you get its reference using the IBOutlet keyword, you are then trying to use the UILabel pointer to point to a space in memory allocated and instantiated for a NSString, that’s why you are having this problem. You probably also did get a warning about that assignment you tried to do:

labelthatrecivesthetextfieldvalue = string;

You should always try to fix warnings.

What you want:

You simply want the UILabel to display the NSString you just created, and for that you should use the UILabel's text property.