.lldbinit

# ...
command script import ~/path/to/viewControllers.py
# ...

viewControllers.py

#!/usr/bin/python

import lldb
import shlex
#import argparse

#def create_argument_parser():
    #description = '''With no arguments, print the view controller hierarchy.'''
    #parser = argparse.ArgumentParser(description=descriptoin, prog='viewControllers')
    #parser.add_argument('-l', '--limit-to-view', dest='view', metavar='address', help='limit controllers to the responder chain for this view')
    #return parser

def viewControllers(debugger, command, result, internal_dict):
    #parser = create_argument_parser()
    #try:
        #args = parser.parse_args(shlex.split(command))
    #except SystemExit:
        ## bad arguments cause ArgumentParser to throw SystemExit
        #result.SetError('argument parsing failed')
        #return
    args = shlex.split(command)
    if len(args) != 1:
        result.SetError('expected one argument')
        return

    target = debugger.GetSelectedTarget()

    code = '''
import UIKit
var results: [UIViewController] = []
for resp in sequence(first: unsafeBitCast('''+args[0]+''', to: UIResponder.self), next: { $0.next }) {
    if let vc = resp as? UIViewController {
        results.append(vc)
    }
}
results'''

    opts = lldb.SBExpressionOptions()
    opts.SetLanguage(lldb.eLanguageTypeSwift)
    opts.SetUnwindOnError(True)
    opts.SetTimeoutInMicroSeconds(5000000) # 5 seconds
    val = target.EvaluateExpression(code, opts)

    if val.error.fail:
        result.SetError(val.error, "unknown error")
        return

    if val.num_children:
        for child in val:
            print >>result, "{} {}".format(child.name, child.description.strip())
    else:
        print >>result, "no results"

def __lldb_init_module(debugger, internal_dict):
    #parser = create_argument_parser()
    #viewControllers.__doc__ = parser.format_help()
    viewControllers.__doc__ = '''Usage: viewControllers <address>

Prints the view controllers in the responder chain for the view identified by <address>.'''
    debugger.HandleCommand('command script add -f viewControllers.viewControllers viewControllers')