线程1：运行项目时出现EXC_BAD_INSTRUCTION错误

Question

当我运行我的项目时，我收到以下错误，线程1：EXC_BAD_INSTRUCTION（代码：EXC_I386_INVOP，子代码= 0x0。我将在下面发布代码，但有人知道如何解决这个问题吗？

它出现在 let type = PFUser.currentUser（）！[＆＃34; Type＆＃34;]为？串

＆＃13;

＆＃13;

 import UIKit
    import Parse
    import ParseUI

    
    class TableViewController: PFQueryTableViewController, PFLogInViewControllerDelegate, PFSignUpViewControllerDelegate {
        
    var usersLocation: PFGeoPoint? {
            didSet {
                // This will reload the tableview when you set the users location.
                // Handy if you want to keep updating it.z
                if (tableView != nil) {
                    tableView.reloadData()
                }
            }
        }
        
        override func  viewDidAppear(animated: Bool) {
            
        }
        
        override func viewDidLoad() {
            super.viewDidLoad()
            
            
            }

        // Initialise the PFQueryTable tableview
        override init(style: UITableViewStyle, className: String!) {
            super.init(style: style, className: className)
        }
        
        required init(coder aDecoder: NSCoder) {
            super.init(coder: aDecoder)
            
            
            // Configure the PFQueryTableView
            self.parseClassName = "User"
            self.textKey = "fullName"
            self.pullToRefreshEnabled = true
            self.paginationEnabled = false
            
            
            
        }
        
        // Define the query that will provide the data for the table view
        override func queryForTable() -> PFQuery{
            
            let type = PFUser.currentUser()!["Type"] as? String
            let age = PFUser.currentUser()!["Age"] as? String
            let fitnessLevel = PFUser.currentUser()!["fitnessLevel"] as? String
            
            var query = PFQuery(className:"User")
            query.whereKey("Type", equalTo: type!)
            query.whereKey("Age", equalTo: age!)
            query.whereKey("fitnessLevel", equalTo: fitnessLevel!)
            
            
            // If we don't have a location, just query without it.
            if let geoLocation = usersLocation {
                query.whereKey("geoLocation", nearGeoPoint:geoLocation)
            }
            query.limit = 100
            return query
        }
        
        //override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
        override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath, object: PFObject?) -> PFTableViewCell {
            
            var cell = tableView.dequeueReusableCellWithIdentifier("CustomCell") as! CustomCell!
            if cell == nil {
                cell = CustomCell(style: UITableViewCellStyle.Default, reuseIdentifier: "CustomCell")
            }
            
            // Extract values from the PFObject to display in the table cell
            if let name = object?["fullName"] as? String {
                cell.name.text = name
            }
            if let type = object?["lookingFor"] as? String {
                cell.type.text = type
            }
            if let location = object?["location"] as? String {
                cell.location.text = location
            }
            
            let cover = object?["cover"] as! PFFile
            cover.getDataInBackgroundWithBlock {
                (imageData: NSData?, error: NSError?) -> Void in
                if error == nil {
                    if let imageData = imageData {
                        let image = UIImage(data:imageData)
                    }
                }
            }
            
            let profile_pic = object?["profile_pic"] as! PFFile
            profile_pic.getDataInBackgroundWithBlock {
                (imageData: NSData?, error: NSError?) -> Void in
                if error == nil {
                    if let imageData = imageData {
                        let image = UIImage(data:imageData)
                    }
                }
            }
            return cell
        }
        
}

＆＃13;

＆＃13;

＆＃13;

Answer 1

显然currentUser()是nil，导致崩溃（!）时发生崩溃。
使用可选绑定：

if let user = PFUser.currentUser() {
  let type = user["Type"] as? String
  let age = user["Age"] as? String
  let fitnessLevel = user["fitnessLevel"] as? String
}