Xcode 7 found a place where it prints a line with a log error

问题

I have a log in XCode output console:

Use -removeDeferredKeyObserver: instead of -removeKeyObserver:

I've searched trough the project using keyword removeKeyObserver but have not found any matches.

My question is how to found a place (line) after Xcode prints this line in console.

回答1:

As it can comes from a library or inside core frameworks, you should :

1. Open terminal
2. use grep "removeKeyObserver:" * -r to find where the method is called

It used this method today for about the same purpose.

来源：https://stackoverflow.com/questions/37391609/xcode-7-found-a-place-where-it-prints-a-line-with-a-log-error