我有一个名为MainTableViewController的类和一个名为IBOutlet的MainTableView。当我尝试在委托函数中重新加载表视图时，出现了在控制台EXC_BAD_INSTRUCTION中读取的Fatal Error: found nil while unwrapping an optional value错误。
当我在类的MainTableView方法中测试变量ViewDidLoad时，它不是nil。但是，当我在委托函数中对其进行测试时，它为nil。
我在这里做错了什么？为什么不能使用出口将数据重新加载到表格视图中？
即使当我尝试使用tableView而不是MainTableView（我的插座）时，我也会遇到很多错误，因此绝对不能。
import UIKit
import SwiftyJSON
class MainTableViewController: UITableViewController, SettingsSidebarViewDelegate {
@IBOutlet var settings: UIBarButtonItem!
@IBOutlet var MainTableView: UITableView!
var NumberofRows = 0
var names = [String]()
var descriptions = [String]()
var categories = [String]()
var types = [String]()
var series = [String]()
var groups = [String]()
func parseJSON(){
let path = NSBundle.mainBundle().URLForResource("documents", withExtension: "json")
let data = NSData(contentsOfURL: path!) as NSData!
let readableJSON = JSON(data: data)
NumberofRows = readableJSON["Documents"].count
for i in 1...NumberofRows {
let doc = "Doc" + "\(i)"
let Name = readableJSON["Documents"][doc]["name"].string as String!
let Description = readableJSON["Documents"][doc]["description"].string as String!
let Category = readableJSON["Documents"][doc]["category"].string as String!
let Type = readableJSON["Documents"][doc]["type"].string as String!
let Series = readableJSON["Documents"][doc]["tags"]["series"].string as String!
let Group = readableJSON["Documents"][doc]["tags"]["group"].string as String!
names.append(Name)
descriptions.append(Description)
categories.append(Category)
types.append(Type)
series.append(Series)
groups.append(Group)
}
}
func showTags(showTags: Bool) {
tableView.reloadData()
}
func showTimestamp(showTimeStamp: Bool) {
tableView.reloadData()
}
override func viewDidLoad() {
super.viewDidLoad()
parseJSON()
//Sets button title to gear, sets button actions (to open menu)
settings.title = NSString(string: "\u{2699}\u{0000FE0E}") as String!
let font = UIFont.systemFontOfSize(25);
settings.setTitleTextAttributes([NSFontAttributeName: font], forState:UIControlState.Normal)
settings.target = self.revealViewController()
settings.action = #selector(SWRevealViewController.rightRevealToggle(_:))
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return NumberofRows
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("MainTableCell", forIndexPath: indexPath) as! MainTableViewCell
if names.count != 0{
cell.fileName.text = names[indexPath.row]
cell.fileDescription.text = descriptions[indexPath.row]
cell.fileCategory.text = categories[indexPath.row]
cell.fileType.text = types[indexPath.row]
cell.options.setTitle(NSString(string: ":") as String!, forState: .Normal)
cell.tag1.text = series[indexPath.row]
cell.tag2.text = groups[indexPath.row]
if showTagsVal{
cell.tag1.hidden = false
}
else{
cell.tag1.hidden = true
}
if showTimeStampVal{
cell.tag2.hidden = false
}
else{
cell.tag2.hidden = true
}
}
return cell
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
self.performSegueWithIdentifier("showView", sender: self)
}
// MARK: - Navigation
//In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if(segue.identifier == "showView"){
let detailVC: DetailViewController = segue.destinationViewController as! DetailViewController
let indexPath = self.MainTableView.indexPathForSelectedRow!
detailVC.text = names[indexPath.row]
self.MainTableView.deselectRowAtIndexPath(indexPath, animated: true)
}
}
}
最佳答案
由于您的MainTableViewController是UITableViewController的子类，因此它已经链接了内置表视图。尝试删除MainTableView插座（以及在界面生成器中所做的所有操作），并且每当需要访问表视图时，都使用从tableView继承的UITableViewController属性。
关于ios - 在Swift中重新加载表数据？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/38417362/