UIAlertView 에 텍스트필드 넣기.

    UIAlertView* dialog = [[[UIAlertView alloc] init] retain];
    [dialog setDelegate:self];
    [dialog setTitle:@"Enter Name"];
    [dialog setMessage:@" "];
    [dialog addButtonWithTitle:@"Cancel"];
    [dialog addButtonWithTitle:@"OK"];
   
    UITextField *nameField = [[UITextField alloc] initWithFrame:CGRectMake(20.0, 45.0, 245.0, 25.0)];
    [nameField setBackgroundColor:[UIColor whiteColor]];
    [dialog addSubview:nameField];
    CGAffineTransform moveUp = CGAffineTransformMakeTranslation(0.0, 100.0);
    [dialog setTransform: moveUp];
    [dialog show];
    [dialog release];
    [nameField release];

참고
http://stackoverflow.com/questions/376104/uitextfield-in-uialertview-on-iphone-how-to-make-it-responsive