其他期待的表达

Question

为什么＆＃39;否则＆＃39;在这种情况下要求表达式？

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


    if(indexPath.row % 2 == 0)
        cell.contentView.backgroundColor = [self colorWithHexString:@"42403E"];
        cell.accessoryView.backgroundColor = [self colorWithHexString:@"42403E"];
    else
        cell.contentView.backgroundColor = [self colorWithHexString:@"494744"];
        cell.accessoryView.backgroundColor = [self colorWithHexString:@"494744"];

}

但是当我使用时它不会出现：

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


    if(indexPath.row % 2 == 0)
        cell.contentView.backgroundColor = [self colorWithHexString:@"42403E"];
    else
        cell.contentView.backgroundColor = [self colorWithHexString:@"494744"];

}

谢谢！

Answer 1

将您的代码更改为：

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


    if(indexPath.row % 2 == 0){
        cell.contentView.backgroundColor = [self colorWithHexString:@"42403E"];
        cell.accessoryView.backgroundColor = [self colorWithHexString:@"42403E"];
    }
    else{
        cell.contentView.backgroundColor = [self colorWithHexString:@"494744"];
        cell.accessoryView.backgroundColor = [self colorWithHexString:@"494744"];
    }

}

如果在条件语句之后有多行代码，最好有代码块。然后编译器更容易解析流程。

希望这有帮助