swift - 线程 1 : EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP error.。不太确定为什么

Question

这是错误发生的地方，在 let selectedStudent 行，

  override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    // Get the new view controller using segue.destinationViewController.
    // Pass the selected object to the new view controller.
    if(segue.identifier == "Student_segue") {
        if let indexPath = self.tableView.indexPathForSelectedRow {
            let selectedStudent = studentsSorted[indexPath.row]
            let destination = segue.destinationViewController as! StudentInfoTableViewController
            destination.selectedStudent = selectedStudent
        }
    }

}

这里是我声明 studentsSorted 和 studentArray 的地方。

typealias studentInfo = Dictionary<String, AnyObject>
typealias studentArray = [studentInfo]

let students = StudentRosterModel()
var studentsSorted:studentArray = studentArray()
var selectedRow:Int = 0

func updateStudentInfo(updatedStudent: Dictionary<String, AnyObject>) {

    // replaced the selected row with the updated key/value dictionary

    studentsSorted [selectedRow ] = updatedStudent

    // sort the revised student list
    studentsSorted.sortInPlace{ ($0["last_name"] as? String) < ($1["last_name"] as? String )}

    // reload () tableView to show refreshed view

    tableView.reloadData()


}

这是我声明 selectedStudent 的地方，

class StudentInfoTableViewController: UITableViewController, UITextFieldDelegate {

var selectedStudent: Dictionary<String, AnyObject> = Dictionary<String, AnyObject>()
var delegate: studentUpdate?

这里真的很困惑，如果有人能帮助我，我将不胜感激。

Answer 1

Thread 1:EXC_BAD_INSTRUCTION

此错误几乎将错误打印到控制台日志中。我知道这个错误可能是由超出范围的错误引起的。

if let indexPath = self.tableView.indexPathForSelectedRow {
    let selectedStudent = studentsSorted[indexPath.row]
    let destination = segue.destinationViewController as! StudentInfoTableViewController
    destination.selectedStudent = selectedStudent
}

如果您将 self.tableView.indexPathForSelectedRow 清除为 indexPath 并且它成功了，那么您认为 indexPath.row 在 studentsSorted 处超过或低于的大小。