Question

我正在制作一个inboxmodule，其中我正在使用表视图，我的tableview数据来自服务器我坚持使用它我想根据来自服务器的标志更改tablecell颜色if messagereadflag = 0然后我想要单元格的灰色，如果消息读取标志= 1，那么我想要清晰的颜色，以便用户可以轻松区分已读和未读的消息。当标志来自下面的服务器时如何才能完成我的回复

-(void)inboxmessagesGetSuccess:(FBGenericWebHandler*)handler response:(NSDictionary*)response
{
    [MBProgressHUD hideHUDForView:self.view animated:YES];

    NSMutableArray *inboxArray = [[NSMutableArray alloc] init];
    NSArray *firstarray=[[[response objectForKey:@"messageResponse"] objectAtIndex:1] objectForKey:@"messages"];
    for(NSDictionary *tmp in firstarray)
    {
        NSMutableDictionary *messages=[[NSMutableDictionary alloc]init];
        [messages setValue:[tmp objectForKey:@"messageId"] forKey:@"messageId"];
        [messages setValue:[tmp objectForKey:@"messageDate"] forKey:@"messageDate"];
        [messages setValue:[tmp objectForKey:@"messageTime"] forKey:@"messageTime"];
        [messages setValue:[tmp objectForKey:@"offerTitle"] forKey:@"offerTitle"];
        [messages setValue:[tmp objectForKey:@"messageRead"] forKey:@"messageRead"];// here are coming flags
        [self.inboxmessagesarray addObject:messages];
    }
    [self.tb reloadData];
    }

以下是我的tableview单元格代码：

  -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

    static NSString *tableviewidentifier = @"cell";
    tablecellTableViewCell *cell= [self.activitiesTableView_ dequeueReusableCellWithIdentifier:tableviewidentifier];

    if(cell==nil)
    {
        cell = [[tablecellTableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:tableviewidentifier];
    }if(indexPath.row == [self tableView:tableView numberOfRowsInSection:indexPath.section] - 1){

    }

    UILabel *valuedate = (UILabel *)[cell viewWithTag:21];
    UILabel *msg = (UILabel *)[cell viewWithTag:22];
    UILabel *date = (UILabel *)[cell viewWithTag:23];
    UILabel *time = (UILabel *)[cell viewWithTag:24];
    if([[[self.inboxmessagesarray objectAtIndex:indexPath.row]objectForKey:@"messageRead"] intValue]==0)
    {
        cell.backgroundColor=[UIColor grayColor];
    }
    else
    {
        cell.backgroundColor=[UIColor clearColor];
    }
    valuedate.text=[[self.inboxmessagesarray objectAtIndex:indexPath.row]objectForKey:@"offerTitle"];
    msg.text=@"How are you?";
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^{
        NSString *img=[[self.inboxmessagesarray objectAtIndex:indexPath.row]objectForKey:@"offerPhoto"];// here i am getting image path
        NSURL *url = [NSURL URLWithString:img];
        NSData * imageData = [NSData dataWithContentsOfURL:url];
        UIImage *image = [UIImage imageWithData:imageData];

        dispatch_sync(dispatch_get_main_queue(), ^{ //in main thread update the image
            cell.imageView.image = image;
            cell.textLabel.text = @""; //add this update will reflect the changes
        });
    });



    date.text=[[self.inboxmessagesarray objectAtIndex:indexPath.row]objectForKey:@"messageDate"];
    time.text=[[self.inboxmessagesarray objectAtIndex:indexPath.row]objectForKey:@"messageTime"];


    return cell;
    }

thanx提前帮助:(

Answer 1

使用 cell.contentView.backgroundColor 代替 cell.backgroundcolor 属性。

在 cellForRowAtIndexPath 方法

中尝试使用此代码

if([[self.inboxmessagesarray objectAtIndex:indexPath.row]objectForKey:@"messageRead"] intValue]==0)
{
    cell.contentView.backgroundColor=[UIColor grayColor];
}
else
{
    cell.contentView.backgroundColor=[UIColor clearColor];
}

或使用 willDisplayCell 方法

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {

        if([[self.inboxmessagesarray objectAtIndex:indexPath.row]objectForKey:@"messageRead"] intValue]==0)
    {
        cell.backgroundColor=[UIColor grayColor];
    }
    else
    {
        cell.backgroundColor=[UIColor clearColor];
    }

}

Answer 2

使用UITableView委托方法更新单元格，

-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {

if([[self.inboxmessagesarray objectAtIndex:indexPath.row]objectForKey:@"messageRead"] intValue]==0)
    {
        cell.backgroundColor=[UIColor grayColor];
    }
    else
    {
        cell.backgroundColor=[UIColor clearColor];
    }

}

Answer 3

在

中添加条件

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

检查标志值。

    if([[self.inboxmessagesarray objectAtIndex:indexPath.row]objectForKey:@"messageRead"] intValue]==0)
    {
        cell.backgroundColor=[UIColor grayColor];
    }
    else
    {
        cell.backgroundColor=[UIColor clearColor];
    }

如何根据来自服务器的标志更改uitableviewcell的颜色

3 个答案: