- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [tableView reloadData];
    UITableViewCell *cell=(UITableViewCell*)[tableView cellForRowAtIndexPath:indexPath];
    [cell setBackgroundColor:[UIColor orangeColor]];
}

Swift 5 - Xcode版本12.1 (12A7403)

| |第一步 将以下内容添加到AppDelegate.swift文件中

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

    let colorView = UIView()
    colorView.backgroundColor = UIColor.lightGray

    UITableViewCell.appearance().selectedBackgroundView = colorView
        
    return true
}

|第二步| 确保在属性检查器中，单元格的内容视图背景设置为“清除颜色”(而不是“默认”)。这样做是为了不与App Delegate设置冲突。

自定义单元格类。覆盖:

- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
    [super setSelected:selected animated:animated];

    // Configure the view for the selected state

    if (selected) {
        [self setBackgroundColor: CELL_SELECTED_BG_COLOR];
        [self.contentView setBackgroundColor: CELL_SELECTED_BG_COLOR];
    }else{
        [self setBackgroundColor: [UIColor clearColor]];
        [self.contentView setBackgroundColor: [UIColor clearColor]];
    }
}

为所有单元格添加背景(使用Maciej的答案):

for (int section = 0; section < [self.tableView numberOfSections]; section++) {
        for (int row = 0; row < [self.tableView numberOfRowsInSection:section]; row++) {
            NSIndexPath* cellPath = [NSIndexPath indexPathForRow:row inSection:section];
            UITableViewCell* cell = [self.tableView cellForRowAtIndexPath:cellPath];

            //stuff to do with each cell
            UIView *bgColorView = [[UIView alloc] init];
            bgColorView.backgroundColor = [UIColor redColor];
            [cell setSelectedBackgroundView:bgColorView];
        }
    } 

对于Swift 3.0:

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    let cell = super.tableView(tableView, cellForRowAt: indexPath)

    cell.contentView.backgroundColor = UIColor.red
}

-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
    UIView *view = [[UIView alloc] init];
    [view setBackgroundColor:[UIColor redColor]];
    [cell setSelectedBackgroundView:view];
}

我们需要在这个方法中设置所选的背景视图。