Question

I am writing some objective-C code and i can’t figure out why this does not work:

buttonRect = CGRectMake(0,0,100.0,100.0);//error:incompatible types in assignment
CGRect newFrame = CGRectInset(buttonRect, -0.2, -0.2);//error:incompatible type for argument 1 of CGRectInset
button.frame = newFrame;

buttonRect is a CGRect defined as an instance variable in my class, and button is a UIButton also defined as an instance variable. Why is this not working?
My header file:

//
//  MyViewController.h
//  HelloWorld
//
//  Created by RCIX on 7/10/09.
//  Copyright 2009 __MyCompanyName__. All rights reserved.
//

#import <UIKit/UIKit.h>


@interface MyViewController : UIViewController {
    UITextField *textField;
    UILabel *label;
    NSString *string;
    UIButton *button;
    CGRect *buttonRect;
}

@property (nonatomic, assign) CGRect *buttonRect;
@property (nonatomic, retain) IBOutlet UITextField *textField;
@property (nonatomic, retain) IBOutlet UILabel *label;
@property (nonatomic, retain) IBOutlet UIButton *button;
@property (nonatomic, retain) NSString *string;

- (IBAction)helloButtonDown:(id)sender;
- (IBAction)helloButtonUp:(id)sender;

@end

Answer 1

buttonRect is declared as a CGRect * — that is, a pointer to a CGRect. Remove the splat and all will be well.