来自 CoreMotion.framework 的奇怪 #NullIsland 警告

Question

最近，我在 Xcode 中记录了很多来自 CoreMotion 框架的奇怪警告，这些警告与功能相关getLocationForBundleID：

[Client] {"msg":"#NullIsland Either the latitude or longitude was exactly 0! That's highly unlikely", "latIsZero":0, "lonIsZero":0}  
[Client] {"msg":"#NullIsland Received a latitude or longitude from getLocationForBundleID that was exactly zero", "latIsZero":0, "lonIsZero":0, "location":'28 5B E0 D7 EB 7F 00 00'}  

我没有看到我的应用程序有任何故障。所以也许这些日志可以被忽略，但无论如何它们都很烦人。

我的问题是：

如何纠正潜在错误？
我怎样才能停止这些警告？

Answer 1

显然，如果在传递第一个位置之前读取locationa 的属性，则会记录此错误消息。CLLocationManagerCLLocationManager

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我的解决方案如下：
\n我无论如何都使用它的子类，CLLocationManager它允许我以编程方式设置location测试属性。\n这是按如下方式完成的：

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private var _location: CLLocation?\n@objc dynamic override var location: CLLocation? {\n    get { \n        let usedLocation = _location ?? super.location // Here the error is logged if no location has been delivered yet\n        return usedLocation \n    }\n    set {\n        _location = newValue\n    }   \n}\n

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这个子类现在有一个额外的属性

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  var anyLocationDelivered = false  \n

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是设置true在

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    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {\n        locationManager.anyLocationDelivered = true\n    // \xe2\x80\xa6\n  }  \n

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现在吸气剂是

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get { \n    guard anyLocationDelivered else { return nil }\n    let usedLocation = _location ?? super.location\n    return usedLocation \n}  \n

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现在不再记录此错误消息。

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