本来打算hard code 一个类，充当当前实现两个类的角色，KeyValueWithIndicatorCell 和 KeyValueWithoutIndicatorCell。但最终实现，还是选择xib自动布局来实现。具体原因如下：

1、hard code实现的话，仍然需要根据hasDetailIndicator这个布尔值，进行布局调整，这个调整在cell update时，而不是cell init时。

2、xib可视化全扫

本打算hard code去实现的code:

public final class HardCodeTestCell: UITableViewCell {
    public var key: UILabel = UILabel()
    public var value: UILabel = UILabel()

    private var detailIndicator: UIImageView = UIImageView()
    private var line: UIView = UIView()

    public var hasDetailIndicator: Bool = true
    public static let height: CGFloat = 44.0


    override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)

        contentView.backgroundColor = UIColor.purple

        line.backgroundColor = UIColor.black
        contentView.addSubview(line)
        line.snp.makeConstraints { (make) in
            make.height.equalTo(0.5)
            make.width.equalTo((line.superview?.snp.width)!)
            make.top.equalToSuperview().offset(43.5)
            make.bottom.equalToSuperview()
        }

        detailIndicator.image = UIImage()
        detailIndicator.snp.makeConstraints { (make) in
            make.top.equalToSuperview().offset(10)
            make.right.equalToSuperview().offset(-10)
            make.bottom.equalToSuperview().offset(-10)
            make.width.equalTo(12)
        }
        if hasDetailIndicator {
            detailIndicator.isHidden = false
        } else {
            detailIndicator.isHidden = true
        }

        key.backgroundColor = UIColor.red
        key.font = UIFont.systemFont(ofSize: 14)
        key.textAlignment = .left
        key.text = "Fiona Yang"
        key.textColor = UIColor.black
        contentView.addSubview(key)
        key.snp.makeConstraints { (make) in
            make.top.equalToSuperview().offset(10)
            make.left.equalToSuperview().offset(10)
            make.bottom.equalToSuperview().offset(-10)
            make.width.greaterThanOrEqualTo(95)
        }

        value.backgroundColor = UIColor.blue
        value.font = UIFont.systemFont(ofSize: 14)
        value.textAlignment = .right
        value.text = "Fiona Yang"
        value.textColor = UIColor.black
        contentView.addSubview(value)
        value.snp.makeConstraints { (make) in

            //TODO: do I need to set offset equal to 10
            make.top.equalToSuperview().offset(10)
            make.right.equalToSuperview().offset(-10)
            make.bottom.equalToSuperview().offset(-10)
            make.width.greaterThanOrEqualTo(194)
//            make.trailing.greaterThanOrEqualTo(value.snp.leadingMargin).offset(5)
            make.leading.greaterThanOrEqualTo(key.snp.trailingMargin).offset(5)

            //            if (hasDetailIndicator) {
            //
            //            } else {
            //
            //            }
        }
    }

    public convenience init(_ hasDetailIndicator: Bool, reuseIdentifier: String?) {

        //TODO: werid, should call init method after all custom properties, while compile error
        self.init(style: .default, reuseIdentifier: reuseIdentifier)
        self.hasDetailIndicator = hasDetailIndicator

        key.snp.makeConstraints { (make) in

            //TODO: do I need to set offset equal to 10
            make.top.equalToSuperview()
            make.leading.equalToSuperview()
            make.bottom.equalToSuperview()
            make.width.lessThanOrEqualTo(95)
            make.trailing.equalTo(value.snp.leading).offset(5)

            if (hasDetailIndicator) {

            } else {

            }
        }
        key.backgroundColor = UIColor.red
        key.font = UIFont.systemFont(ofSize: 14)
        key.textAlignment = .left
        key.text = "Fiona Yang"
        key.textColor = UIColor.black
        contentView.addSubview(key)
    }

    required public init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }
}

tableview调用:

tableView.register(HardCodeTestCell.self, forCellReuseIdentifier: "\(HardCodeTestCell.self)")

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        var cell: HardCodeTestCell? = tableView.dequeueReusableCell(withIdentifier: "HardCodeTestCell", for: indexPath) as? HardCodeTestCell

        if cell == nil {
            cell = HardCodeTestCell(true, reuseIdentifier: "HardCodeTestCell")
        }

        // Configure the cell...


        return cell!
    }

实现过程中，未弄懂的地方:

1. 这行代码并未调用cell的public convenience init(_ hasDetailIndicator: Bool, reuseIdentifier: String?)方法?
2. 不理解这几行代码:

required public init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

1. 当前cell中的public convenience init(_ hasDetailIndicator: Bool, reuseIdentifier: String?)方法，应该需要重新命名成fillData，从而更新布局，在

override init(style: UITableViewCellStyle, reuseIdentifier: String?)

此方法中创建所有cell。