Answer 1

Answer 2

Answer 3

[self presentModalViewController：sec animated：YES];应该高于setText 试试吧

-(void)buttonclick:(id)sender
{
    NSString *s = [sender titleForState:UIControlStateNormal];  
    //sec.ss = s;

    [self presentModalViewController:sec animated:YES];


    [sec settext:s];

}

希望它能奏效....