Question

I have classes
*ColorViewController
*DrawRectangle

In ColorViewController.h:

#import "DrawRectangle.h"
@interface ColorViewController : UIViewController {
DrawRectangle *DrawRectangle;
}

@property (nonatomic,retain) DrawRectangle *DrawRectangle;

And in DrawRectangle.h:

@interface DrawRectangle : UIView {
CGFloat redc;
}
@property (nonatomic) CGFloat redc;

I have also added the DrawRectangle class in ViewController.xib to one of UIView.

I want to change the value of CGFloat redc from file ColorViewController.m
I’m doing it this way:

- (void)viewDidLoad
{
CGFloat myfloat = 1.0;
self.DrawRectangle.redc = myfloat;

I’m calling NSLog with this ‘redc’ in DrawRectangle, but it says 0.0000000 each time.

How can I replace the value of ‘redc’ from ViewController? I don’t think I need to use NSNotification, there must be easier way if I have the DrawRectangle loaded into ViewController.

Answer 1

Looks like your object hasn’t been instantiated yet. Try:

-(void)viewDidLoad {
    [super viewDidLoad];

    CGFloat myfloat = 1.0;
    [drawRectangle setRedc:myfloat];
}

You should also avoid naming your objects the same name as the class as a general programming practice. I Would suggest renaming the object to drawRectangle.

You also need to hook up your drawRectangle object in your xib

@property (nonatomic, retain) IBOutlet DrawRectangle *drawRectangle;