设置键盘顶部显示的工具条

- (void)createKeyboardTool
{
    keyboardTool = [[UIToolbar alloc] initWithFrame: CGRectMake(kZero, kZero, kScreenW, 44.0f)];
    NSMutableArray *myToolBarItems = [NSMutableArray array];

　　//创建键盘工具条上面的按钮,并设置点击事件
    UIBarButtonItem *cancelBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemReply target:self action:@selector(cancelAction)];
    UIBarButtonItem *space = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:@selector(saveAction)];
    UIBarButtonItem *saveBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(saveAction)];
    
    [myToolBarItems addObject:cancelBtn];
    [myToolBarItems addObject:space];
    [myToolBarItems addObject:saveBtn];
    keyboardTool.items = myToolBarItems;
}

    //inputAccessoryView:设置键盘顶部显示的工具条;inputView:自定义键盘
    commentTextView = [[UITextView alloc]initWithFrame:CGRectMake(kZero, kZero, kScreenW, 200)];
    [commentTextView becomeFirstResponder];
    commentTextView.inputAccessoryView = keyboardTool;