The first step is probably to go to the Product menu in your project in Xcode and hold down the option key and choose Clean Build Folder..., to make sure there isn't any previously compiled code causing problems because of incompatibility.I don't think upgrading OS X to the El Capitan would improve anything for you, since a lot of us are just running Xcode 7 beta on Yosemite.If you haven't already backed up your project, you might want to do that before updating the code further, just in case you end up deciding to go back and wait.Assuming there isn't isn't anything really weird going on with your project, you would just need to work your way through it fixing the errors and warnings generated by the compiler. There can be a lot of new errors and warnings because of the changes between Swift 1.2 and 2 and the updates to Cocoa, but most of the errors and warnings should be relatively trivial to fix (changing var to let, updating the old generic sort/map/filter/find functions to be called as methods,
Topic:
App & System Services
SubTopic:
Core OS
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