在3楼看到答案后，我试图弄清楚设置TableView和TableViewCell之间的分隔符是什么关系，并做了一些测试。以下是我的结论:

we can consider that setting the cell's separator to zero has to move the separator in two steps: first step is to set cell's separatorinset to zero. second step is to set cell's marginlayout to zero. set the TableView's separatorinset and marginlayout can affect the Cell's separatorinset. However, from the test, I find that the TableView's separatorinset seem to be useless, TableView's marginlayout can actually affect cell's marginlayout. set Cell's PreservesSuperviewLayoutMargins = false, can cut off TableView's marginlayout effect on Cells. one of the solutions: func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { var cell = UITableViewCell() cell.preservesSuperviewLayoutMargins = false cell.separatorInset = UIEdgeInsetsZero cell.layoutMargins = UIEdgeInsetsZero return cell }

你可以使用一次UIAppearance，在你的应用程序启动时(在UI被加载之前)，把它设置为默认的全局设置:

// iOS 7:
[[UITableView appearance] setSeparatorStyle:UITableViewCellSeparatorStyleSingleLine];
[[UITableView appearance] setSeparatorInset:UIEdgeInsetsZero];

[[UITableViewCell appearance] setSeparatorInset:UIEdgeInsetsZero];

// iOS 8:
if ([UITableView instancesRespondToSelector:@selector(setLayoutMargins:)]) {

    [[UITableView appearance] setLayoutMargins:UIEdgeInsetsZero];
    [[UITableViewCell appearance] setLayoutMargins:UIEdgeInsetsZero];
    [[UITableViewCell appearance] setPreservesSuperviewLayoutMargins:NO];

}

这样，你可以保持你的UIViewController的代码干净，如果你想重写它。

在Swift中，这有点烦人，因为layoutmargin是一个属性，所以你必须重写getter和setter。

override var layoutMargins: UIEdgeInsets {
  get { return UIEdgeInsetsZero }
  set(newVal) {}
}

这将有效地使layoutmargin为只读，这在我的情况下是好的。

大多数答案是显示分隔符插入和布局边距设置在各种方法(即viewDidLayoutSubviews, willDisplayCell等)的单元格和表视图，但我发现，只是把这些cellForRowAtIndexPath工作得很好。似乎是最干净的方法。

// kill insets for iOS 8
if ([[UIDevice currentDevice].systemVersion floatValue] >= 8) {
    cell.preservesSuperviewLayoutMargins = NO;
    [cell setLayoutMargins:UIEdgeInsetsZero];
}
// iOS 7 and later
if ([cell respondsToSelector:@selector(setSeparatorInset:)])
    [cell setSeparatorInset:UIEdgeInsetsZero];

只需重写cellForRowAtIndexPath并设置cell。preservessuperviewlayoutmargin = false" and "cell。separatorInset = UIEdgeInsets。零”和“单元格”。layoutmargin = uiedgeinsets . 0 "

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell: LayoutTableViewCell! = tableView.dequeueReusableCell(withIdentifier: "LayoutCell") as? LayoutTableViewCell



    let currentLayout = OrderLayouts()[indexPath.row]

    cell.NameLabel?.text = currentLayout.name
    cell.DescrLabel?.text = currentLayout.descr

    if(GlobalVariables.debug){

        cell.DescrLabel?.text = "\(currentLayout.id) \n \(currentLayout.descr)"

    }

    cell.preservesSuperviewLayoutMargins = false
    cell.separatorInset = UIEdgeInsets.zero
    cell.layoutMargins = UIEdgeInsets.zero


    return cell

}

Arg ! !在你的Cell子类中做这些事情后:

- (UIEdgeInsets)layoutMargins
{
    return UIEdgeInsetsZero;
}

或者设置单元格。layoutmargin = UIEdgeInsetsZero;帮我修好了。