- (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
    if (action == @selector(copy:)) {
        return YES;
    }
    return NO;
}

- (void)copy:(id)sender {
    [self resignFirstResponder];
    //持久化，退出程序 copy 的内容还在
    [[UIPasteboard generalPasteboard]setPersistent:YES];
    //拷贝的内容
    [[UIPasteboard generalPasteboard]setValue:self.text forPasteboardType:[UIPasteboardTypeListString objectAtIndex:0]];
}

field = [[CCField alloc]initWithFrame:CGRectMake(100, 200, 100, 40)];
    field.backgroundColor = [UIColor greenColor];
    [self.view addSubview:field];
    
    UIMenuItem *shareItem = [[UIMenuItem alloc]initWithTitle:@"分享" action:@selector(click)];
    UIMenuController *menu = [UIMenuController sharedMenuController];
    [menu setMenuItems:[NSArray arrayWithObjects:shareItem, nil]];

    SendMessageToWXReq *sendReq = [[SendMessageToWXReq alloc]init];
    // 使用文本信息
    sendReq.bText = YES;
    // 发到还有列表 ， 默认是 0
    sendReq.scene = 0;
    
    sendReq.text = field.text;
    //发送分享信息
    [WXApi sendReq:sendReq];
    NSLog(@"213");