Question

I am trying to achieve something like this in objective c.

@try{
//some code that will raise exception
}
@catch(CustomException e){//How to create this
//catching mechanism
}
@catch(NSException e){
//Generic catch
}

I need to create CustomException class and use it. Could you please help me in creating this CustomException and guide me in how to use this.

Thanks in advance.

Answer 1

In the simplest case, I can declare a class using…

@interface CustomException : NSException
@end
@implementation CustomException
@end

…and the code is very much like what you posted:

   @try{
        @throw [[CustomException alloc] initWithName:@"Custom" reason:@"Testing" userInfo:nil];
    }
    @catch(CustomException *ce){
        NSLog(@"Caught custom exception");
    }
    @catch(NSException *e){
        NSLog(@"Caught generic exception");
    }