Problem extending UIButton for iOS - uibutton

Question

I trying to extend UIButton but I keep getting a "EXC_BAD_ACCESS", inside the initializer of ColorButton's implementation file.
Header of ColorButton.
#import <Foundation/Foundation.h>
#interface ColorButton : UIButton {
UIImage * originalImage;
}
#property (nonatomic,readonly) NSString * buttonName;
-(id) initButtonWithName:(NSString *) color;
-(void) setOriginalImage;
-(void) setImage:(UIImage *) image;
#end
ColorButton Implementation
#import "ColorButton.h"
#implementation ColorButton
#synthesize buttonName;
-(id) initButtonWithName:(NSString *) color {
if ((self = (ColorButton *)[UIButton buttonWithType:UIButtonTypeCustom])) {
buttonName = color;
[self setTitle:buttonName forState:UIControlStateNormal]; //This is the line of the "EXC_BAD_ACCESS" error.
[self setBackgroundImage:[self backgroundImageForDevice:color] forState:UIControlStateNormal]; // This line gets the error too. If I comment the line before it out.
}
return self;
}
-(UIImage *) backgroundImageForDevice:(NSString *) color {
color = [color stringByAppendingString:#"Bubble"];
if ([[[UIDevice currentDevice] model] isEqualToString:#"iPad"] ||[[[UIDevice currentDevice] model] isEqualToString:#"iPad Simulator"]) {
color = [color stringByAppendingString:#"-iPad"];
}
color = [color stringByAppendingString:#".png"];
return [UIImage imageNamed:color];
}
-(void) setOriginalImage {
[self setBackgroundImage:originalImage forState:UIControlStateNormal];
}
-(void) setImage:(UIImage *) image {
[self setImage:image forState:UIControlStateNormal];
}
#end

Answer 1

You can not cast a UIButton * instance to a ColorButton * type.
You have to remember that you ColorButton inherits from UIButton and not the other way, this means that every instance of ColorButton is a UIButton by definition, but the opposite is not true.
Here is another thread that has the exact same issue :)
objective C: Buttons created from subclass of UIButton class not working