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Editorial Team
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Asked: 2026-06-16T21:40:28+00:00

I’m trying to simulate touch in iOS. There some pointers in SO suggest that

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I’m trying to simulate touch in iOS. There some pointers in SO suggest that I could try GraphicsServices/GSEvent.h in the private framework. However, when I followed the steps here, I got these errors:

    Undefined symbols for architecture armv7:
    "_GSCopyPurpleNamedPort", referenced from:
    -[TestGraphicsServicesAppDelegate application:didFinishLaunchingWithOptions:] in TestGraphicsServicesAppDelegate.o
    "_GSSendEvent", referenced from:
    -[TestGraphicsServicesAppDelegate application:didFinishLaunchingWithOptions:] in TestGraphicsServicesAppDelegate.o
    ld: symbol(s) not found for architecture armv7
    clang: error: linker command failed with exit code 1 (use -v to see invocation)

Any suggestion? Thanks

edit:
the code I used is from Using GraphicsServices.h/GSEvent as well as compiling CLI iPhone tools with Xcode.

Looks like the errors are from this line.

    mach_port_t thePortOfApp = GSCopyPurpleNamedPort...
    GSSendEvent(&record, thePortOfApp);
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1 Answer

  1. Editorial Team

    OK, I think I made some mistakes when I added the framework.
    Somehow I got my project working now.

    The errors have gone away after I did a couple things.
    In Build Setting, I changed Always Search User Paths to Yes.
    Added the path to the private header in User Header Search Paths.
    Also, in Build Phrases tab, I add the GraphicsServices in the Link Binary with Libraries section.

    Now I can do simple stuff like GSEventLockDevice() and simulating pressing home button.
    Still have no clue about touch.

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