我在应用中将UITableViewCellSelectionStyle设置为blue时遇到问题。不知何故，每次都会将值覆盖到gray。
我的故事板文件中没有TableViewController。实际上在代码中调用了以下行，但结果颜色为灰色：
cell.selectionStyle = .default
TableViewController.swift（完成）：
import UIKit
typealias FilterSelectionHandler = (_ returnValue:String?) -> Void
@objc class TableViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UIPopoverPresentationControllerDelegate {
var values:[String] = []
var preSelectedValue: String = ""
var selectedIndex = 99
var selectionHandler: FilterSelectionHandler?
let width:CGFloat = 300
let height: CGFloat = 180
fileprivate var tableView: UITableView!
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.tableView.sizeToFit()
self.tableView.frame = CGRect(x: self.tableView.frame.origin.x, y: self.tableView.frame.origin.y, width: self.width, height: self.tableView.bounds.height + 20)
self.preferredContentSize = self.tableView.bounds.size
}
override func viewDidLoad() {
super.viewDidLoad()
self.view.translatesAutoresizingMaskIntoConstraints = false
//// tableview
self.tableView = UITableView(frame:self.view.frame)
self.tableView.translatesAutoresizingMaskIntoConstraints = false
self.tableView!.dataSource = self
self.tableView!.delegate = self
self.tableView.separatorStyle = .singleLine
self.tableView.isScrollEnabled = false;
self.tableView.register(UITableViewCell.self, forCellReuseIdentifier: "DefaultCell")
self.view.addSubview(self.tableView)
//// constraints
self.tableView.leftAnchor.constraint(equalTo: view.leftAnchor,
constant: 0).isActive = true
self.tableView.rightAnchor.constraint(equalTo: view.rightAnchor,
constant: 0).isActive = true
self.tableView.topAnchor.constraint(equalTo: view.topAnchor,
constant: 0).isActive = true
self.tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor,
constant: 0).isActive = true
// default selection
for myValue:String in self.values {
if self.preSelectedValue == myValue {
self.selectedIndex = self.values.index(of: myValue)!
break
}
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell: UITableViewCell = tableView.dequeueReusableCell(withIdentifier: "DefaultCell", for: indexPath) as UITableViewCell
if (indexPath.row == self.selectedIndex) {
cell.setSelected(true, animated: false)
}
cell.textLabel?.text = values[(indexPath as NSIndexPath).row]
cell.selectionStyle = .default // Default (blue) selection style is not being set
return cell
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.values.count
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
selectionHandler?(self.values[(indexPath as NSIndexPath).row])
dismiss(animated: true, completion: nil)
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 50
}
func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
let label: TableHeaderLabel = TableHeaderLabel()
label.text = "Title"
label.backgroundColor = UIColor(red:(46 / 255), green:(83 / 255), blue:(155 / 255), alpha:1);
label.textColor = UIColor.white;
return label
}
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
return "void"
}
func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
return 30.0
}
func selectWasDone (_ selectionHandler:@escaping FilterSelectionHandler){
self.selectionHandler = selectionHandler
}
}