iOS & Xcode Tips

xcode-tips.sh

https://www.raywenderlich.com/72021/supercharging-xcode-efficiency

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# Close Xcode & the iOS Simulator

# http://stackoverflow.com/a/30940055
# Remove any old runtimes from this directory.
cd /Library/Developer/CoreSimulator/Profiles/Runtimes
# e.g.
sudo rm -rf iOS\ 8.1.simruntime

# http://stackoverflow.com/a/11790983
# Remove the download receipts for simulators you don't need anymore.
# Otherwise Xcode might try to reinstall them for you.
cd ~/Library/Caches/com.apple.dt.Xcode/Downloads
# e.g.
rm com.apple.pkg.iPhoneSimulatorSDK8_1-8.1.1.1354140590.dmg

# Restart Xcode & the iOS Simulator.
# You should notice the old simulators are gone. They will be available to download again in Xcode → Settings → Downloads → Components

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Core data debugging

https://forums.developer.apple.com/thread/63315

From iOS10 release notes on CoreData: 
log stream —predicate 'subsystem = "com.apple.coredata"'