Swift sending Multiple Objects to View Controller

问题

I am trying to send multiple objects from my initial view controller to my Username VC. Here is the segue code from my controllers: The issue comes when I add in the code to send the second object, termreport. If I delete the termsM and the assignment, it send the students as usually, but I also need to send the termReport object. How would I fix this?

ViewControler:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    guard let students = sender as AnyObject as? [Student]
    else { return }
    guard let termsM = sender as AnyObject as? [TermReport] //How would I send both objects?
    else { return }
    if let secondVC = segue.destination as? UsernameVC {
        secondVC.students = students
        secondVC.userWebView = webView
        secondVC.terms = termsM // not sending
    }
    let gradeResponse = try Parser(innerHTML)
    self.performSegue(withIdentifier: "ShowStudents", sender: gradeResponse.students)
    self.performSegue(withIdentifier: "ShowStudents", sender: gradeResponse.termReports) //how would I send both variables?

UsernameVC:

var terms: [TermReport]!
override func viewDidLoad() {
    print("TERM \(terms[0].grades[3])")//returns found nil optional ERROR
}

回答1:

You have to include all of the variables you want to send to another ViewController using a segue into a single object (which can be a collection as well). You either create a custom class/struct that has properties with type [Student] and [TermReport] or put these into a native collection (Tuple or Dictionary).

Create custom struct:

struct TermData {
   var students = [Student]()
   var termReports = [TermReport]()
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    guard let segueData = sender as? TermData
    else { return }
    if let secondVC = segue.destination as? UsernameVC {
        secondVC.students = segueData.students
        secondVC.userWebView = webView
        secondVC.terms = segueData.termReports
        }
}     

let gradeResponse = try Parser(innerHTML)
let termData = TermData(students: gradeResponse.students, termReports: gradeResponse.termReports)
self.performSegue(withIdentifier: "ShowStudents", sender: termData)

来源：https://stackoverflow.com/questions/44850357/swift-sending-multiple-objects-to-view-controller

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ios

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swift3

segue