Question

I’m trying to sub class the uibutton class and add some extra metheds to it.

If I ceate a class as follows

cTest *mTest=[cTest buttonWithType:UIButtonTypeRoundedRect];

and call any methed, one i created or allready there, example [cTest setTitle:@"test" forState: UIControlStateNormal]; crashes.

my cTest class:

#import <Foundation/Foundation.h>

@interface cTest : UIButton { 
    int i;
}

-(void) aTest;

@end

code to test the class:

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
    [super viewDidLoad];

// this works fine
    UIButton *mBut=[UIButton buttonWithType:UIButtonTypeRoundedRect];
    [mBut setTitle:@"test" forState: UIControlStateNormal];   


// this does NOT  
    cTest *mTest=[cTest buttonWithType:UIButtonTypeRoundedRect];
    [cTest setTitle:@"test" forState: UIControlStateNormal];
    [mTest aTest]; // crashes here does not call my function
}

Ted

Answer 1

UIButton buttonWithType: simply returns a UIButton* object, not a cTest* object.

You wil have to provide a class method (factory method)
+ (cTest*) cTestWithType:

That one does not call [super buttonWithType:…] neither.
Instead of that you will have to create a new cTest object with alloc (and retain or autorelease, what ever serves your purpose best) and initialize it by setting the buttonType property.

… or just do the same without providing a factory method.