Question

我很快有两个班，TestView()和compileResults()。

我在compileResults()中有返回值的函数。我需要将该值返回给TestView()。

我设法在compileResults()的{{1}}中设置了一个值，但似乎无法返回一个值。

我已经以与在其他地方使用代理相同的方式设置了一个代理，但它似乎仍未产生结果。

TestView：

TestView()

compileResults：

import UIKit
import Foundation

class TestView: UIViewController, XMLParserDelegate {

    weak var resStartDelegate: ResStartDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()

        resStartDelegate?.setConTypeResult(val: "WiFi")
        print("ConType is: ", resStartDelegate?.getConTypeResult()) //outputs value nil
    }

编辑：这似乎可以按我的意愿工作，这有什么问题吗？

compileResults.swift

import Foundation

protocol ResStartDelegate: class {
    func getConTypeResult() -> String
    func setConTypeResult(val: String)
}

var testViewDelegate = TestView()

var theTestResults : [String: String] = [
    "conType": ""
]

class complileResults : ResStartDelegate {

    init() {
        setDelegate()
    }

    func setDelegate() {
        testViewDelegate.resStartDelegate = self
    }

    func resetResults() {
        theTestResults["conType"] = ""
    }

    func setConTypeResult(val: String) {
        theTestResults["conType"] = val
        print("Just set contype to: ", theTestResults["conType"]) //prints correctly what has been passed from TestView
    }

    func getConTypeResult() -> String {
        return theTestResults["conType"] ?? "Err"
    }

}

TestView.swift

import Foundation

class complileResults {//: ResStartDelegate {

    var theTestResults : [String: String] = [
        "conType": "",
        "date": "",
        "time": "",
        "jitter": "",
        "loss": "",
        "dspeed": "",
        "uspeed": "",
        "delay": ""
    ]

    func setConTypeResult(val: String) {
        theTestResults["conType"] = val
    }

    func getConTypeResult() -> String {
        return theTestResults["conType"] ?? "Err"
    }
}

Answer 1

有一些方法可以做到这一点。

    class complileResults {

    var theTestResults : [String: String] = [
        "conType": "",
        "date": "",
        "time": "",
        "jitter": "",
        "loss": "",
        "dspeed": "",
        "uspeed": "",
        "delay": ""
    ]
}

class TestView: UIViewController, XMLParserDelegate {

    let result = complileResults()

    override func viewDidLoad() {
        super.viewDidLoad()
        result.theTestResults["conType"] = "WiFi"
        print(result.theTestResults["conType"] ?? "Err")
    }
}

或者说这个更通用。

class orcomplileResults {

    var theTestResults : [String: String] = [
        "conType": "",
        "date": "",
        "time": "",
        "jitter": "",
        "loss": "",
        "dspeed": "",
        "uspeed": "",
        "delay": ""
    ]

    func setResult(key: String, value: String) {
        theTestResults[key] = value
    }

    func getResult(key: String) -> String {
        return (theTestResults[key] ?? "Err")
    }
}

class orTestView: UIViewController, XMLParserDelegate {

    let result = orcomplileResults()

    override func viewDidLoad() {
        super.viewDidLoad()
        result.setResult(key: "conType", value: "WiFi")
        print(result.getResult(key: "conType"))
    }
}

Answer 2

您的问题是complileResults().setConTypeResult(val: "WiFi")与weak var resStartDelegate: ResStartDelegate?是不同的实例，这就是为什么要从resStartDelegate.getConTypeResult获取零的原因。

您的协议应具有setConTypeResult(string)方法，并将complileResults().setConTypeResult(val: "WiFi")更改为resStartDelegate?.setConTypeResult(val: "WiFi")

class TestView: UIViewController, XMLParserDelegate {

    weak var resStartDelegate: ResStartDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()

        resStartDelegate?.setConTypeResult(val: "WiFi")
        print("ConType is: ", resStartDelegate?.getConTypeResult()) //outputs value nil
    }


protocol ResStartDelegate: class {
    func getConTypeResult() -> String
    func setConTypeResult(val: String)
}

从另一个类的func获取返回值

2 个答案: