Xcode is incredibly useful for debugging iOS apps, especially with the updates released in the last few years. Sometimes that isn’t enough. Sometimes you want to find the exact error that caused an exception throw, or only activate a breakpoint with a certain method previously in the call stack. These cases, which are hard to debug with Xcode’s standard toolset, are easy to debug with LLDB. This talk will walk through the foundations of debugging in LLDB for Objective-C and Swift, as well as introduce some more advanced features for those really tough bugs.