Iphone AlertView应自行消失

如何在不使用任何取消按钮的情况下使alertview自行消失。？

使用此

-(void)showAlertView
{
   // code for showing your alertView
   [self performSelector:@selector(dismissAlertView) withObject:yourObject afterDelay:5]
}

-(void)dismissAlertView
{
    [yourAlert dismissWithClickedButtonIndex:0 animated:YES];
}

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谢谢它的工作…但它消失得太快了…如何让它在那里停留一段时间。？