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1. The Esri Help/documentation does not say whether prior versions of the SDK should be uninstalled before installing a new version or not. It'd be helpful if the documentation clarified this point.
2. The Online documentation topic "Configuring an Xcode Project" says to add the following compiler linker flags: "-ObjC -all_load -framework ArcGIS". But the samples also include the additional flag "-lstdc++". Is the latter required? Small detail I know, but the documentation and samples are not consistent here.
User is an administrator is not the reason of this. Let's diagnose the issue. Please follow below steps and send the information.
1. Open Terminal and type command, 'echo $HOME' (without quotes). Send the output.
2. Open /Application/Utilities/Console >> Click 'Clear Display'.
3. Now install the SDK, you'll see the install logs in the Console display.
4. Send us the log information.
5. Since, the SDK is getting installed at /Library, you'll see a AGSiOSSDK folder under /Library/Application Support. Please give manifest file from that folder.
Regards,
Nimesh