如何在popover中呈现键盘？,ipad密码锁定风格

不幸的是没有,但是我要复制的是,使用界面构建器在我的密码视图中构建了一组像键盘一样的按钮.然后将每个按钮@L_197_4@到将更改文本字段的命令.

- (IBACtion) button9_clicked:(id) sender{

    if ([self textField:theTextField shouldChangeCharactersInRange:range replacementString:@"9"]){
        self.theTextField.text=[self.theTextField.text StringByAppendingString:@"9"];
        range.LOCATIOn = self.theTextField.text.length;
    }
    else 
        range.LOCATIOn = self.theTextField.text.length;
}