第一步

自定义UILabel
重写下面两个方法

//让label有资格成为第一响应者
- (BOOL)becomeFirstResponder
{
    return YES;
}

//label能执行哪些操作(比如 拷贝 等)
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender
{
    if (action == @selector(copy:) || action == @selector(paste:) || action == @selector(cut:)) return YES;
    return NO;
}

第二步

实现相应功能的方法

- (void)copy:(UIMenuController *)menu
{
    //将自己的文字赋值到粘贴板
    [self copy:menu];
    //清空文字
    self.text = nil;
}

- (void)paste:(UIMenuController *)menu
{
    //将自己的文字赋值到粘贴板
    UIPasteboard * board = [UIPasteboard generalPasteboard];
    board.string = self.text;
}

- (void)cut:(UIMenuController *)menu
{
    UIPasteboard * board = [UIPasteboard generalPasteboard];
    self.text = board.string;
}

第三步

给UILabel添加手势

- (void)awakeFromNib
{
    [self setup];
    [super awakeFromNib];
}

- (instancetype)initWithFrame:(CGRect)frame
{
    if (self == [super initWithFrame:frame]) {
        [self setup];
    }
    return self;
}

- (void)setup
{
    self.userInteractionEnabled = YES;
    
    [self addGestureRecognizer:[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(labelClick)]];
}

显示menu

- (void)labelClick
{
    //1.让label成为第一响应者(这里的self是UILabel)
    [self becomeFirstResponder];
    
    //2.显示menuController
    UIMenuController * menu = [UIMenuController sharedMenuController];
//    [menu setTargetRect:self.frame inView:self.superview];
    [menu setTargetRect:self.bounds inView:self];
    [menu setMenuVisible:YES animated:YES];
    
    NSLog(@"%s",__func__);
}

OVER

如果你想自定义的话可以写下面方法(相应的实现方法需要再控制器里面实现不然用不了)

UIMenuController * menu = [UIMenuController sharedMenuController];
UIMenuItem * reply = [[UIMenuItem alloc]initWithTitle:@"回复" action:@selector(replay:)];
UIMenuItem * ding = [[UIMenuItem alloc]initWithTitle:@"顶" action:@selector(ding:)];
UIMenuItem * report = [[UIMenuItem alloc]initWithTitle:@"举报" action:@selector(report:)];
menu.menuItems = @[reply,ding,report];