error with UITableView

I have the following things:

in header file

 UITableView *catalogTable;
 UIScrollView *scrollView;

implementation file

 - (void)viewDidLoad
{
    [super viewDidLoad];
    catalogTable.backgroundColor = [UIColor clearColor];
    catalogTable.separatorColor = [UIColor colorWithRed:171/255.f green:171/255.f blue:171/255.f alpha:220/255.0];

    catalogTable.layer.cornerRadius=15;
    scrollView.layer.cornerRadius = 15;
    [scrollView setShowsVerticalScrollIndicator:NO];
    scrollView.layer.borderWidth = 2;
    scrollView.layer.borderColor = [UIColor colorWithRed:109开发者_JAVA百科/255.f 
                                                   green:114/255.f 
                                                    blue:114/255.f 
                                                   alpha:0.65/1.0].CGColor;
}

The problem is that I can't run this as I have error at these lines:

catalogTable.layer.cornerRadius=15;
scrollView.layer.cornerRadius = 15;

saying that:Property cornerRadius not found on object of type CALayer.

I don't know what to do with this...and can't figure out what I'm doing wrong. The strangest thing is that I copied the code from another class where it worked.I copied the whole thing and out of no where came this error.Anyone has any idea?

To eliminate that error you need to import <QuartzCore/QuartzCore.h> header in your file. Without that header compiler can't access information about CALayer class and the properties it has.

P.S. just in case - you'll also need to link with QuartzCore.framework to make things work

As like @Vladimir said,add the following line

#import <QuartzCore/QuartzCore.h>