cell 上的剪贴板

长按cell 显示剪贴板选项，在cell上添加手势，把处理方法放在delegateVC 里面，如果VC本身有textView，不释放键盘

#pragma mark - 剪贴板

//剪贴板

- (void)showCopyMenu:(id)cell {

    if (self.menuVisible) {

        return;

    }

    BOOL haskeyboard = NO;

    if ([self.iTextView isFirstResponder]) {

        haskeyboard = YES;

        self.donotHideKeyBoard = YES;

    }

    self.iCopyCell = cell;

    [self becomeFirstResponder];

    UIMenuController * menu = [UIMenuController sharedMenuController];

    [menu update];

    CGRect frame = [cell frame];

    frame.origin.y +=25;

    [menu setTargetRect: frame inView: self.iTableView];

    [menu setMenuVisible: YES animated: YES];

    if (haskeyboard) {

        [self.iTextView becomeFirstResponder];

    }

}

-(void)setMenuHidden:(NSNotification*)aNoti{

    self.menuVisible = NO;

}

-(void)setMenuShow:(NSNotification*)aNoti{

    self.menuVisible = YES;

}

-(BOOL)canBecomeFirstResponder{

    return YES;

}

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

    if (action == @selector(copy:)) {

        return YES;

    }

    else

    {

        return [super canPerformAction:action withSender:sender];

    }

}

-(void)copy:(id)sender{

    if ([sender isKindOfClass:[UIMenuController class]]) {

        if (self.iCopyCell) {

            UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];

            [pasteboard setString:self.iCopyCell.iMessageLabel.text];

        }

    }

}