单元格的颜色仅在退出应用程序后才会更改

Question

我试图在不同颜色的表视图中放置一些单元格。问题是它们只有在退出应用程序后才会变色。每次我创建一个新单元格时，它都会被默认颜色着色（但退出应用程序或模拟器并重新打开后，它们都会根据我的需要进行着色。）

添加单元格后，我应该怎么做才能刷新颜色？谢谢！

这是我的代码：

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath{
if(indexPath.row==0) cell.contentView.backgroundColor = [UIColor colorWithRed:36.0/255.0 green:230.0/255.0 blue:146.0/255.0 alpha:1.0f];
if(indexPath.row==1) cell.contentView.backgroundColor = [UIColor colorWithRed:72.0/255.0 green:214.0/255.0 blue:202.0/255.0 alpha:1.0f];
if(indexPath.row==2) cell.contentView.backgroundColor = [UIColor colorWithRed:0.0/255.0 green:132.0/255.0 blue:255.0/255.0 alpha:1.0f];
if(indexPath.row==3) cell.contentView.backgroundColor = [UIColor colorWithRed:0.0/255.0 green:84.0/255.0 blue:255.0/255.0 alpha:1.0f];
if(indexPath.row==4) cell.contentView.backgroundColor = [UIColor colorWithRed:243.0/255.0 green:207.0/255.0 blue:7.0/255.0 alpha:1.0f];
if(indexPath.row==5) cell.contentView.backgroundColor = [UIColor colorWithRed:243.0/255.0 green:157.0/255.0 blue:7.0/255.0 alpha:1.0f];

}

Answer 1

这似乎是你应该在方法cellForRowAtIndexPath中做的事情，它返回给定索引路径的单元格。作为单元格设置的一部分，您可以设置它的背景颜色。

Answer 2

工作代码。

1）设置小区标识符

2）在您的.m文件中

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"cellIdentifier";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

    if (cell == nil) {
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
    }

    if(indexPath.row==0) cell.contentView.backgroundColor = [UIColor colorWithRed:36.0/255.0 green:230.0/255.0 blue:146.0/255.0 alpha:1.0f];
    if(indexPath.row==1) cell.contentView.backgroundColor = [UIColor colorWithRed:72.0/255.0 green:214.0/255.0 blue:202.0/255.0 alpha:1.0f];
    if(indexPath.row==2) cell.contentView.backgroundColor = [UIColor colorWithRed:0.0/255.0 green:132.0/255.0 blue:255.0/255.0 alpha:1.0f];
    if(indexPath.row==3) cell.contentView.backgroundColor = [UIColor colorWithRed:0.0/255.0 green:84.0/255.0 blue:255.0/255.0 alpha:1.0f];
    if(indexPath.row==4) cell.contentView.backgroundColor = [UIColor colorWithRed:243.0/255.0 green:207.0/255.0 blue:7.0/255.0 alpha:1.0f];
    if(indexPath.row==5) cell.contentView.backgroundColor = [UIColor colorWithRed:243.0/255.0 green:157.0/255.0 blue:7.0/255.0 alpha:1.0f];

    return cell;
}

Answer 3

这就是我解决问题的方法：

[self.tableView insertRowsAtIndexPaths:@[newIndexPath] withRowAnimation:UITableViewRowAnimationAutomatic];

这是我的最终代码：

- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type newIndexPath:(NSIndexPath *)newIndexPath {
switch (type) {
    case NSFetchedResultsChangeInsert:
        [self.tableView insertRowsAtIndexPaths:@[newIndexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
        [self.tableView reloadSections:[NSIndexSet indexSetWithIndex:0] withRowAnimation:UITableViewRowAnimationAutomatic];
        break;
    case NSFetchedResultsChangeDelete:
        [self.tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
        [self.tableView reloadSections:[NSIndexSet indexSetWithIndex:0] withRowAnimation:UITableViewRowAnimationAutomatic];
        break;
    case NSFetchedResultsChangeUpdate:
        [self.tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
        [self.tableView reloadSections:[NSIndexSet indexSetWithIndex:0] withRowAnimation:UITableViewRowAnimationAutomatic];
        break;
} }