模拟器上的Xcode错误:此平台不支持MGIsDeviceOneOfType [英] Xcode Error on Simulator: MGIsDeviceOneOfType is not supported on this platform

问题描述

我有一个非常简单的应用程序，具有一个视图，其中包含多个UILabel.在Simulator中运行时，Xcode控制台返回错误:

I have a very simple application with a single view, containing several UILabels. Upon running in Simulator, the Xcode console returns the error:

libMobileGestalt MobileGestalt.c:875:此平台不支持MGIsDeviceOneOfType.

libMobileGestalt MobileGestalt.c:875: MGIsDeviceOneOfType is not supported on this platform.

模拟器本身仅显示白屏.我也尝试过在具有相同白屏的开发人员设备上运行它.我已经搜索了文档，但是找不到对MGIsDeviceOneOfType的任何引用. 该应用程序是在macOS 10.14上的Xcode 10 beta中用Swift编写的.我正在尝试在运行目标软件(12.0)的iPhone 7-X Simulator和开发版iPhone 7上运行它.

The Simulator itself just shows a white screen. I've also tried running it on a developer device with the same white screen. I've searched documentation but can't find any reference to MGIsDeviceOneOfType. The application is written in Swift in Xcode 10 beta on macOS 10.14. I am attempting to run it on the iPhone 7-X Simulators, as well as a development iPhone 7, all running the target software (12.0).

推荐答案

MobileGestalt

libMobileGestalt.dylib 为iOS的所有属性提供了一个中央存储库.它可以类似于OS X的格式塔(Gestalt)，它是CoreServices的一部分. OS X的格式塔记录了例如格式塔管理器，自10.8起已弃用. Apple完全没有记录 MobileGestalt ，因为它是一个私有库.

The libMobileGestalt.dylib provides a central repository for all of the iOS's properties. It can be analogous to OS X's Gestalt, which is part of CoreServices. OS X's Gestalt is documented for example Gestalt Manager and has been deprecated as of 10.8. MobileGestalt is entirely undocumented by Apple as it is a private library.

MobileGestalt允许测试可能在不同模拟器上兼容或不兼容的系统属性.

MobileGestalt allows for the testing of system properties that may or may not be compatible on different simulators.

iOS中有很多系统进程和应用程序都依赖于MobileGestalt，该文件位于/usr/lib/libMobileGestalt.dylib.它更像是一个基本库，但是其公开的API遵循Apple框架约定，并使用MG API前缀(例如MGIsDeviceOneOfType).

Quite a few system processes and apps in iOS rely on MobileGestalt, which is located at /usr/lib/libMobileGestalt.dylib. It's more of a basic library, but its exposed APIs follow the Apple framework conventions and uses the MG API prefix for example MGIsDeviceOneOfType.

如果您在iOS文件系统上寻找MobileGestalt，则找不到它-像所有私有框架和库一样，它已经预链接到/System/Library/Caches/...etc.如果您喜欢黑客和笔测试，则可以使用工具将其提取.

If you look for MobileGestalt on the iOS filesystem you won't find it - like all private frameworks and libraries, it has been prelinked into the /System/Library/Caches/...etc. If you like hacking and pen-testing then you can use tools to extract it.

MobileGestalt提供了大量有关系统各个方面的信息-大约200个查询.这里有一些.

MobileGestalt provides plenty of information - around 200 or so queries - on various aspects of the system. Here are a few.

libMobileGestalt.dylib
//Answers to MG queries

MGCopyAnswer(@"5MSZn7w3nnJp22VbpqaxLQ");
MGCopyAnswer(@"7mV26K/1a+wTtqiunvHMUQ");
MGCopyAnswer(@"BasebandAPTimeSync");
MGCopyAnswer(@"BasebandPostponementStatus");
MGCopyAnswer(@"BasebandPostponementStatusBlob");
MGCopyAnswer(@"BasebandSecurityInfoBlob");
MGCopyAnswer(@"BasebandStatus");
MGCopyAnswer(@"BuildVersion");
MGCopyAnswer(@"CoreRoutineCapability");
MGCopyAnswer(@"DeviceClass");
MGCopyAnswer(@"DeviceClassNumber");
MGCopyAnswer(@"DeviceName");
MGCopyAnswer(@"DeviceSupports1080p");
MGCopyAnswer(@"DeviceSupports720p");
MGCopyAnswer(@"DiskUsage");
MGCopyAnswer(@"GSDeviceName");
MGCopyAnswer(@"HWModelStr");
MGCopyAnswer(@"HasBaseband");
MGCopyAnswer(@"InternalBuild");
MGCopyAnswer(@"InverseDeviceID");
MGCopyAnswer(@"IsSimulator");
MGCopyAnswer(@"MLBSerialNumber");
MGCopyAnswer(@"MaxH264PlaybackLevel");
MGCopyAnswer(@"MinimumSupportediTunesVersion");
MGCopyAnswer(@"PasswordConfigured");
MGCopyAnswer(@"PasswordProtected");
MGCopyAnswer(@"ProductType");
MGCopyAnswer(@"ProductVersion");
MGCopyAnswer(@"RegionCode");
MGCopyAnswer(@"RegionalBehaviorNTSC");
MGCopyAnswer(@"RegionalBehaviorNoPasscodeLocationTiles");
MGCopyAnswer(@"ReleaseType");
MGCopyAnswer(@"SIMStatus");

还有数百个AirplaneMode，MobileEquipmentIdentifier等

MobileGestalt维护OSType选择器代码的表. 例如消息中的 c:890 : libMobileGestalt MobileGestalt.c:890:此平台不支持MGIsDeviceOneOfType.在这种情况下，MGIsDeviceOneOfType是 MobileGestalt库.

MobileGestalt maintains a table of OSType selector codes. for example c:890 in the message: libMobileGestalt MobileGestalt.c:890: MGIsDeviceOneOfType is not supported on this platform. In this case MGIsDeviceOneOfType is a method of the MobileGestalt library.

代替检查模拟器版本，有一个单独的选择器可以直接查询模拟器的功能.该消息很可能表明模拟器版本与Xcode版本和/或模拟器上不受支持的API之间不兼容.

Instead of checking the simulator version there is a separate selector for directly querying the capabilities of the simulator. The messages most likely indicate incompatibilities between simulator versions and Xcode versions and/or unsupported APIs on the simulator.

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