Question

My iOS application uses a number of third party components licensed under Apache 2.0 and similar licenses, which requires me to include various bits of text, this kind of thing:

* Redistributions in binary form must reproduce the above copyright
  notice, this list of conditions and the following disclaimer in the
  documentation and/or other materials provided with the distribution.

There seems to be a reasonable precedent for putting this information under a ‘License’ subentry in settings bundle (on the ipad facebook, pages, keynote, numbers and wikipanion all seem to do this).

I’m struggling a bit to actually achieve the same though; I seem to need to split the text up line by line and enter into xcode a line at a time (and xcode4 seems to have a crashing problem when editing the plists).

It seems like the kind of thing that there’s almost certainly a somewhere script to do, or some simple way to do it that I’ve missed.

Answer 1

I think I’ve now managed to solve all the problems I was running into.

• It seems to be best to use group element titles to hold the licenses (this is what Apple do in the iWork apps). There is however a limit on the length of these (and I’ve not yet discovered exactly what the limit is), so you need to break each license file into multiple strings.
• You can create a line break within these by include a literal carriage return (ie. otherwise known as ^M, \r or 0x0A)
• Make sure not to include any literal “s mid-text. If you do, some or all of the strings in the file will get silently ignored.

I’ve got a convenience script I use to help generate the .plist and .strings file, shown below.

To use it:

1. Create a ‘licenses’ directory under your project
2. Put script into that directory
3. Put each license into that directory, one per file, with filenames that end .license
4. Perform any necessary reformatting on the licenses. (eg. remove extra spaces at the beginning of lines, ensure that there are no line breaks mid-paragraph). There should be a blank line in-between each paragraph
5. Change to licenses directory & run the script
6. Edit your settings bundle Root.plist to include a child section called ‘Acknowledgements’

Here’s the script:

#!/usr/bin/perl -w

use strict;

my $out = "../Settings.bundle/en.lproj/Acknowledgements.strings";
my $plistout =  "../Settings.bundle/Acknowledgements.plist";

unlink $out;

open(my $outfh, '>', $out) or die $!;
open(my $plistfh, '>', $plistout) or die $!;

print $plistfh <<'EOD';
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
        <key>StringsTable</key>
        <string>Acknowledgements</string>
        <key>PreferenceSpecifiers</key>
        <array>
EOD
for my $i (sort glob("*.license"))
{
    my $value=`cat $i`;
    $value =~ s/\r//g;
    $value =~ s/\n/\r/g;
    $value =~ s/[ \t]+\r/\r/g;
    $value =~ s/\"/\'/g;
    my $key=$i;
    $key =~ s/\.license$//;

    my $cnt = 1;
    my $keynum = $key;
    for my $str (split /\r\r/, $value)
    {
        print $plistfh <<"EOD";
                <dict>
                        <key>Type</key>
                        <string>PSGroupSpecifier</string>
                        <key>Title</key>
                        <string>$keynum</string>
                </dict>
EOD

        print $outfh "\"$keynum\" = \"$str\";\n";
        $keynum = $key.(++$cnt);
    }
}

print $plistfh <<'EOD';
        </array>
</dict>
</plist>
EOD
close($outfh);
close($plistfh);

Setting up your Settings.bundle

If you haven’t created a Settings.bundle, go to File –> New –> New File…

Under the Resource section, find the Settings Bundle. Use the default name and save it to the root of your project.

Expand the Settings.bundle group and select Root.plist. You will need to add a new section where its key will be Preference Items of type Array. Add the following information:

The Filename key points to the plist that was created by this script. You can change the title to what ever you want.

Execute Script At Build Time

Also, if you want this script to run whenever you build your project, you can add a build phase to your target:

1. Go to your project file
2. Select the target
3. Click the Build Phases tab
4. In the lower right corner of that pane, click on ‘Add Build Phase’
5. Select ‘Add Run Script’
6. Drag and drop your perl script into the section for your script. Modify to look something like this:

1. cd $SRCROOT/licenses ($SRCROOT points to the root of your project)
2. ./yourScriptName.pl

After you have finished that, you can drag the Run Script build phase sooner in the build process. You’ll want to move it up before Compile Sources so that the updates to your Settings Bundle get compiled and copied over.

Update for iOS 7: iOS 7 seems to handle the “Title” key different and is messing up the rendered text. To fix that the generated Acknowledgements.plist needs to use the “FooterText” key instead of “Title”. This how to change the script:

for my $str (split /\r\r/, $value)
{
    print $plistfh <<"EOD";
            <dict>
                    <key>Type</key>
                    <string>PSGroupSpecifier</string>
                    <key>FooterText</key> # <= here is the change
                    <string>$keynum</string>
            </dict>
 EOD

    print $outfh "\"$keynum\" = \"$str\";\n";
    $keynum = $key.(++$cnt);
}