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dual0j's questions

Martin Hope
dual0j
Asked: 2025-02-07 22:35:16 +0800 CST
  • 6

我正在尝试重构应用程序的现有实现，使其符合 Swift 6。为此，我必须接触以下提供“在 Safari 中打开 url”共享扩展的类：

import Foundation
import UIKit

public final class SafariActivity: UIActivity {

    var url: URL?
    
    // MARK: - UIActivity Implementation
    
    public override var activityType: UIActivity.ActivityType {
        .openInSafari
    }
    
    public override var activityTitle: String? {
        "Open in Safari"
    }
    
    public override var activityImage: UIImage? {
        UIImage(systemName: "safari")?.applyingSymbolConfiguration(.init(scale: .large))
    }
    
    public override func canPerform(withActivityItems activityItems: [Any]) -> Bool {
        // ERROR: Main actor-isolated class property 'shared' can not be referenced from a nonisolated context
        activityItems.contains { $0 is URL ? UIApplication.shared.canOpenURL($0 as! URL) : false }
    }
    
    public override func prepare(withActivityItems activityItems: [Any]) {
        // ERROR: Main actor-isolated class property 'shared' can not be referenced from a nonisolated context
        url = activityItems.first { $0 is URL ? UIApplication.shared.canOpenURL($0 as! URL) : false } as? URL
    }
    
    public override func perform() {
        if let url = url {
            // ERROR: Call to main actor-isolated instance method 'open(_:options:completionHandler:)' in a synchronous nonisolated context
            UIApplication.shared.open(url)
        }
        self.activityDidFinish(true)
    }
}

extension UIActivity.ActivityType {
    static let openInSafari = UIActivity.ActivityType(rawValue: "openInSafari")
}

extension UIActivity {
    @MainActor public static let openInSafari = SafariActivity()
}

我很难理解将覆盖的方法限制在主线程的正确方法。如何将覆盖的方法从UIActivity隔离改为@MainActor？

swift