iOS Error with GCRectMake - Sending 'int' to parameter of incompatible type 'CGRect' (aka 'struct CGRect')

Question

I'm new in the iOS programming.

I am following a guide, a book precisely on iOS in Italian. For the first application, I have to modify ViewController.m like this:

#import "ViewController.h"

@implementation ViewController

- (void)didReceiveMemoryWarning{
    [super didReceiveMemoryWarning];
    // Release Any chached data, images, etc that aren't in use.
}    

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

- (void)datiDettaglioChiudi:(datiDettaglio *)controller{
    //altre operazioni possibii dopo la dismissModal
    NSLog(@"... di ritorno dal DismissModal...");
    [controller dismissViewControllerAnimated:YES completion:nil];
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
    if([segue.identifier isEqualToString:@"dettaglio"]){
        datiDettaglio *mioController1 = segue.destinationViewController;
        [mioController1 setDelegate:self];
        //aggiunta di una UILabel - qui è possibile personalizzare la propria vista     direttamente da codice
        UILabel *testLabel = [[UILabel alloc] initWithFrame: GCRectMake(30,100,250,40)];
        [testLabel setText:@"Etichetta di test"];
        [testLabel setBackgroundColor:[UIColor greenColor]];
        [testLabel setTextColor:[UIColor blackColor]];
        [mioController1.view addSubview:testLabel];

    }
}

- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
}


@end

The problem is here:

UILabel *testLabel = [[UILabel alloc] initWithFrame: GCRectMake(30,100,250,40)];

On the GCRectMake: I've one warning and one errors:

WARNING Implicit declaration of function 'GCRectMake' is invalid in C99
ERROR   Sending 'int' to parameter of incompatible type 'CGRect' (aka 'struct CGRect')

I really can not understand what is wrong.

Answer 1

It's CGRectMake, not GCRectMake. The CG stands for Core Graphics.

Answer 2

This (in addition to my comment) should fix the error

 UILabel *testLabel = [[UILabel alloc] initWithFrame: CGRectMake(30.0f,100.0f,250.0f,40.0f)];