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Resolving
Q: I have a JavaScript test that successfully automates user interactions in the iPhone Simulator under the iOS SDK 4.0. I upgraded to iOS SDK 4.0.1; Instruments displays "Unexpected error in -[UIATarget_0x.. frontMostApp], /SourceCache/UIAutomation_Sim/UIAutomation-37/Framework/UIATargetElements.m line 437" when I run the above script in the iPhone Simulator.
A: You are getting the "Unexpected error in -[UIATarget_0x.. frontMostApp], /SourceCache/UIAutomation_Sim/UIAutomation-37/Framework/UIATargetElements.m line 437" error message because of a bug in Instruments with iOS SDK 4.0.1.
UI Automation is Accessibility based. As such, the Automation instruments reads and writes an accessibility preference file (specified by com.apple.Accessibility.plist
) for the iPhone Simulator at
~/Library/Application Support/iPhone Simulator/<version> where <version> is an iOS SDK version. |
In iOS SDK 4.0.1, Automation writes the above file at
~/Library/Application Support/iPhone Simulator/4.0 |
but reads it at
~/Library/Application Support/iPhone Simulator/4.0.1 |
Automation displays the above error message since com.apple.Accessibility.plist
does not exist at its expected location. You can workaround this bug by making a symlink between your iPhone Simulator 4.0 and 4.0.1 folders.
Follow these steps to create a symlink between your iPhone Simulator 4.0 and 4.0.1 folders:
Quit Instruments and the iPhone Simulator if they are opened.
Run the following commands in the Terminal application on your machine:
cd ~/Library/Application\ Support/iPhone\ Simulator/
ln -s 4.0.1 4.0
Document Revision History
Date | Notes |
---|---|
2010-08-06 | New document that describes how to resolve the "UIATarget_0x.. frontMostApp]..UIATargetElements.m line 437" error message in Instruments. |
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