Question

我做了一个快速测试，并尝试将闭包作为函数参数传递，但注意某种＆＃34;异常＆＃34;。该应用程序没有崩溃，但是有问题的行生成崩溃报告。

的ViewController

import UIKit

class MapViewController: UIViewController {

    typealias MapTouchHandler = (String) -> Void

    var mapTouchHandlers = Array<MapTouchHandler>()

    @IBAction func tapGestureAction(_ sender: UITapGestureRecognizer) {
            for handler in mapTouchHandlers {

                // This line produces this: "0x000000010c8f8a00 Mediator`partial apply forwarder for reabstraction thunk helper from @callee_owned (@in Swift.String) -> (@out ()) to @callee_owned (@owned Swift.String) -> () at MapViewController.swift"

                handler("tap recognized")
            }

    }

    override func viewDidLoad() {
        super.viewDidLoad()
    }



     func subscribeMapTouchEvent(mapTouchHandler: @escaping MapTouchHandler) {

           // This line produce this: "0x000000010c8ff910 Mediator`partial apply forwarder with unmangled suffix ".16" at Mediator.swift"

            mapTouchHandlers.append(mapTouchHandler)
    }
}

调解员班级

import UIKit

class Mediator {

    var mapViewController: MapViewController? {
        didSet {
            mapViewController?.subscribeMapTouchEvent(mapTouchHandler: self.handleTouchEvent(str:))
        }
    }

    private func handleTouchEvent(str: String) {
        print(str)
    }
}

欣赏解决此问题的任何见解。

Answer 1

如果您正在使用在块中引用“自我”，我建议您使用弱自我，例如。 DispatchQueue.main.async { [weak self] in self?.yourProperty = ... }

Answer 2

从Apple Developer Forum查看此问答答。给您的提示：找到可能nil的变量并与Objective-C代码有关。我修好了我的虫子。祝你好运！

Swift关闭＆＃34;部分应用转发器＆＃34;

2 个答案: