对我来说，除了这个解决方案(Swift 3.0)之外，其他方法都不起作用:

extension UIColor {
    static func colorWith(hex:String, alpha: CGFloat) -> UIColor {
        var cString = hex.trimmingCharacters(in: .whitespacesAndNewlines).uppercased()

        if cString.hasPrefix("#") {
            cString.remove(at: cString.startIndex)
        }

        if cString.characters.count != 6 {
            return UIColor.gray
        }

        var rgbValue:UInt32 = 0
        Scanner(string: cString).scanHexInt32(&rgbValue)

        return UIColor(red:   CGFloat((rgbValue & 0xFF0000) >> 16) / 255.0,
                       green: CGFloat((rgbValue & 0x00FF00) >> 8)  / 255.0,
                       blue:  CGFloat( rgbValue & 0x0000FF)        / 255.0,
                       alpha: alpha)
    }
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: cellReuseIdendifier, for: indexPath)

    cell.backgroundColor = UIColor.colorWith(hex: "c8c7cc", alpha: 1) // same color of line separator

    return cell
}

Swift 3.0示例:

func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
    // removing seperator inset
    if cell.responds(to: #selector(setter: UITableViewCell.separatorInset)) {
        cell.separatorInset = .zero
    }
    // prevent the cell from inheriting the tableView's margin settings
    if cell.responds(to: #selector(setter: UIView.preservesSuperviewLayoutMargins)) {
        cell.preservesSuperviewLayoutMargins = false
    }
    // explicitly setting cell's layout margins
    if cell.responds(to: #selector(setter: UITableViewCell.layoutMargins)) {
        cell.layoutMargins = .zero
    }
}

Swift 2.0扩展

我只是想分享一个扩展，我做了删除边缘从tableview单元格分隔符。

extension UITableViewCell {
    func removeMargins() {

        if self.respondsToSelector("setSeparatorInset:") {
            self.separatorInset = UIEdgeInsetsZero
        }

        if self.respondsToSelector("setPreservesSuperviewLayoutMargins:") {
            self.preservesSuperviewLayoutMargins = false
        }

        if self.respondsToSelector("setLayoutMargins:") {
            self.layoutMargins = UIEdgeInsetsZero
        }
    }
}

用于上下文中:

    let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! CustomCell

    cell.removeMargins()
    return cell

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

}

这是在Swift中为我工作的代码:

override func viewDidLoad() 
{
    super.viewDidLoad()
    ...
    if tableView.respondsToSelector("setSeparatorInset:") {
        tableView.separatorInset = UIEdgeInsetsZero
    }
}

func tableView(tableView: UITableView, willDisplayCell cell: UITableViewCell,forRowAtIndexPath indexPath: NSIndexPath)
{
    if cell.respondsToSelector("setSeparatorInset:") {
        cell.separatorInset.left = CGFloat(0.0)
    }
    if tableView.respondsToSelector("setLayoutMargins:") {
        tableView.layoutMargins = UIEdgeInsetsZero
    }
    if cell.respondsToSelector("setLayoutMargins:") {
        cell.layoutMargins.left = CGFloat(0.0)
    }
}

这对我来说似乎是最干净的(目前)，因为所有的单元格/tableView边缘/边缘调整都是在tableView:willDisplayCell:forRowAtIndexPath:方法中完成的，而不是在tableView:cellForRowAtIndexPath:中填充不必要的代码。

顺便说一句，我只是设置单元格的左separatorInset/ layoutmargin，因为在这种情况下，我不想搞砸我在单元格中设置的约束。

代码更新到Swift 2.2:

 override func viewDidLoad() {
   super.viewDidLoad()       

    if tableView.respondsToSelector(Selector("setSeparatorInset:")) {
      tableView.separatorInset = UIEdgeInsetsZero
        }
    }

 override func tableView(tableView: UITableView, willDisplayCell cell: UITableViewCell,forRowAtIndexPath indexPath: NSIndexPath) {
        if cell.respondsToSelector(Selector("setSeparatorInset:")) {
            cell.separatorInset.left = CGFloat(0.0)
        }
        if tableView.respondsToSelector(Selector("setLayoutMargins:")) {
            tableView.layoutMargins = UIEdgeInsetsZero
        }
        if cell.respondsToSelector(Selector("setLayoutMargins:")) {
            cell.layoutMargins.left = CGFloat(0.0)
        }
    }

使用Swift 2.2

创建UITableViewCell扩展

import UIKit

extension UITableViewCell {
    func removeMargins() {

        if self.respondsToSelector(Selector("setSeparatorInset:")) {
            self.separatorInset = UIEdgeInsetsZero
        }

        if self.respondsToSelector(Selector("setPreservesSuperviewLayoutMargins:")) {
            self.preservesSuperviewLayoutMargins = false
        }

        if self.respondsToSelector(Selector("setLayoutMargins:")) {
            self.layoutMargins = UIEdgeInsetsZero
        }
    }
} 

现在可以在cellForRowAtIndex中使用

-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
            cell.removeMargins()//To remove seprator inset 
}