UIMenuController

UIMenuController 的创建

UIMenuController *menu = [UIMenuController sharedMenuController];

// 设置菜单内容

menu.menuItems = @[

[[UIMenuItem alloc] initWithTitle:@"顶" action:@selector(ding)],

[[UIMenuItem alloc] initWithTitle:@"撤销" action:@selector(del)]

];

CGFloat  maxY = CGRectGetMaxY(self.contentLabel.frame)+5;

// 显示位置

CGRect rect = CGRectMake(0, maxY, 160, 60);

[menu setTargetRect:rect inView:self];

// 显示出来

[menu setMenuVisible:YES animated:YES];

关键是即使UIMenuController在当前控制器子视图中

下面 这两个方法必须写到当前控制器中。才能正常显示

// 用于UIMenuController显示，缺一不可

-(BOOL)canBecomeFirstResponder{

    return YES;

}

// 用于UIMenuController显示，缺一不可

-(BOOL)canPerformAction:(SEL)action withSender:(id)sender{

if (action ==@selector(ding) || action ==@selector(del)){

        return YES;

}

return NO;//隐藏系统默认的菜单项

}