LLDB script to summarize Qt types in Xcode.

lldb_qt.py

import lldb

def __lldb_init_module(debugger, internal_dict):
    debugger.HandleCommand('type summary add QString -F lldb_qt.QString_summary')
    debugger.HandleCommand('type summary add QUuid -F lldb_qt.QUuid_summary')
    print 'lldb_qt.py has been loaded and is ready for use.'

def QString_summary(value, internal_dict):
    name = value.GetName()
    deref = '->' if value.TypeIsPointerType() else '.'
    return value.frame.EvaluateExpression(name + deref + 'toStdString()').GetSummary()

def QUuid_summary(value, internal_dict):
    name = value.GetName()
    deref = '->' if value.TypeIsPointerType() else '.'
    return value.frame.EvaluateExpression(name + deref + 'toString().toStdString()').GetSummary()

Copy this file to ~/Library/Developer/LLDB/ and add the following line to your ~/.lldbinit

command script import ~/Library/Developer/LLDB/lldb_qt.py

Good script, it still works 10 years after!
Just put the print argument in brackets, and wanted install it at Xcode startup, put the import command in a ~/.lldbinit-Xcode script file.
Thanks!