对于 SceneDelegate，LaunchOptions 始终为零

Question

我已经调查了重要位置。 我想在不运行应用程序时获取位置信息。 https://developer.apple.com/documentation/corelocation/getting_the_user_s_location/using_the_significant- change_location_service

下面的代码是获取位置信息的触发器。

func application(_ application: UIApplication,
                     didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        if launchOptions?[.location] != nil {
            locationManager.startMonitoringSignificantLocationChanges()
        }
        return true
    }

但我遇到了一个奇怪的行为。
当应用程序通过重要位置事件启动时。

仅限 AppDelegate：launchOptions?[.location] 不为 nil
AppDelegate + SceneDelegate：launchOptions？[.location]始终为零

我无法从SceneDelegate方法获得类似的值。

SceneDelegate 截图

如果我想使用与位置相关的 launchOptions，是否只使用 AppDelegate 更好？

Answer 1

UIApplicationLaunchOptionsLocationKey 或 launchOptions?[.location] 目前仅适用于应用程序委托生命周期（从 iOS 7.4 开始），即删除 SceneDelegate 类并删除场景清单时来自 Info.plist。

要获得场景生命周期，您需要自己破解信息，例如：

Info.plist

Principal class = MyApplication

YourApp-Bridging-Header.h

#import "MyApplication.h"

MyApplication.h< /strong>

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface MyApplication: UIApplication

@property (assign, nonatomic) BOOL significantLocationCausedLaunch;

@end

NS_ASSUME_NONNULL_END

MyApplication.m

#import "MyApplication.h"

@interface UIApplication() // private methods

-(void)_connectUISceneFromFBSScene:(id)scene transitionContext:(id)context;

@end


@implementation MyApplication

- (void)_connectUISceneFromFBSScene:(UIScene *)scene transitionContext:(id)context {
    NSDictionary *payload = [context performSelector:@selector(payload)];
    self.significantLocationCausedLaunch = [[payload valueForKey:@"CLLaunchOptionsLocation"] boolValue];
    [super _connectUISceneFromFBSScene:scene transitionContext:context];
}

@end

现在您可以在场景委托中检索它，如下所示：

   func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        
        if let myApp = UIApplication.shared as? MyApplication {
            if myApp.significantLocationCausedLaunch {
                print("significantLocationCausedLaunch")
            }
        }
        
        guard let _ = (scene as? UIWindowScene) else { return }
    }

我通过反馈报告了场景生命周期的此限制，以便将其作为 .backgroundTask(.significantLocation) 添加到 SwiftUI 为 FB13699977 请随时在您的报告中引用。

Answer 2

当您使用场景委托时，您应该使用 scene(:,willConnectTo session:,options:) 函数

 func scene(_ scene: UIScene,
               willConnectTo session: UISceneSession,
               options connectionOptions: UIScene.ConnectionOptions) {
// handle universal links
        if let userActivity = connectionOptions.userActivities.first {
            self.scene(scene, continue: userActivity)
        } else {
// handle other urls (f.e. your custom schemes)
            self.scene(scene, openURLContexts: connectionOptions.urlContexts)
        }
    }