Writing on Tablets Tech stuff from @yeltzland

iOS 16 Yeltzland Release

iOS 16 should be available any day soon now, so I’ve been adding some new features to the Yeltzland app to take advantage.

Lock Screen widgets

The biggest visible change in iOS 16 are the new lock screen widgets - which presumably will be great with the heaviliy rumoured always-on screens of the new phones.

The widgets show either the latest score, the last result or the next upcoming fixture, whatever is the most relevant at the current time.

The app already had Apple Watch complications, which made it very little work to add similar widgets on the lock screen.

Screenshot of the new lock screen widgets

It took a bit of fiddling to get the update frequency working correctly, especially during the match. This works quite well now, especially if you have the game time tweet notifications feature turned on (which I can use to trigger an widget update out of the scheduled timeline)

As you can see from the screenshot above, I’ve also added a new “badge only” widget, which just shows the club badge if you just want to personalise your phone a bit.

Improved complications on the Apple Watch

Watch complications and lock screen widget code has been unified, so I’ve been able to combine the code for both into a single extension.

This also means the watch complications are a bit better now, as they benefit from the work I put in to keep them better updated as the goals fly in.

Better Siri Shortcuts

Thankfully the old intent definition code has been deprecated into a much nicer system using AppIntents. This makes it much nicer to both define and build the logic for Shortcuts support, as well as to be able to donate shortcut suggestions directly from the app.

This means I have been able to delete a whole load of code - which is always nice - and simplify the discovery of the shortcuts the app supports.

There’s how I use the shortcuts (so I can ask Siri the latest score) …

Screenshot of a Yeltzland action in Shortcuts

… plus how it looks visually when this shortcut is run

Screenshot of the shortcut result dialog


It’s been the quietest summer for a while on the new feature front, with not many customer facing changes of note in iOS 16.

However, I think the lock screen widgets are a big improvement, and I’m pretty happy how they’ve turned out.

Let’s see if we have any surprises later today when the new hardware is announced 🤞

iOS Yeltzland Widgets

Adding Entries In Spotlight Search

Surprisingly easy to do

I’ve had a bit of down time recently - which has been great - and in-between watching the Euros and the Tour de France, I’ve had time to watch quite a few WWDC videos.

One video entitled Showcase app data in Spotlight looked interesting, as I’d never considered adding anything from any of my apps into Spotlight Search.

Now the video itself wasn’t massively useful for me, as it was most about how you can feed Core Data easily into Spotlight - and I don’t really use Core Data unless I absolutely have to!

However, it inspired me to get the fixture and results data from my Yeltzland app into Spotlight.

Adding entries into Spotlight

The logic of my code is as follows:

  1. Listen for updates to the fixtures data
  2. On update, first remove all entries for the fixture data domain identifier (a unique string denoting the set of entries)
  3. Then add a new index entry for each match in the data set

The full code is available on GitHub and should be pretty self-explanatory.

To remove all entries for a domain identifer, simply call:

    withDomainIdentifiers: [SpotlightManager.domainIdentifier],
    completionHandler: completionHandler)

Then the code to add an individual entry to the search index is straightforward too:

    var items: [CSSearchableItem] = []
    // Fetch all fixtures
    let fixtures = FixtureManager.shared.allMatches
    for fixture in fixtures {

        // Create an attribute set to describe the fixture
        let attributeSet = CSSearchableItemAttributeSet(itemContentType: kUTTypeData as String)
        attributeSet.title = fixture.spotlightSearchTitle
        attributeSet.contentDescription = fixture.spotlightSearchDescription
        // Create an item with a unique identifier, a domain identifier, and the attribute set you created earlier.
        let item = CSSearchableItem(uniqueIdentifier: "\(SpotlightManager.domainIdentifier)-\(fixture.identifier)",
                                    domainIdentifier: SpotlightManager.domainIdentifier,
                                    attributeSet: attributeSet)
    CSSearchableIndex.default().indexSearchableItems(items) { error in
        if let error = error {
            print("Error add spotlight entries: ", error.localizedDescription)
        } else {
            print("Spotlight entries successfully added")

How it looks

That was all very simple, and you can see in the screenshot below it came out very nicely

Spotlight Example

If I’d have know it was that easy (and how to do it!), I would have added this years ago 😀

iOS Search

WWDC 2021 Wishlist

Annual list of things if announced next week would make me very happy

It’s that time of year again when Apple presents what exciting new features iOS developers are going to be integrating into their apps over the summer.

I’m surprisingly excited about WWDC 2021, and as per tradition here’s my top 5 list of what I’d love to see announced.

1. iPadOS multi-tasking improvements

Once again iPadOS is falling behind, both in parity with iOS14 features, and allowing users take full advantage of the fantastic hardware power of modern iPads.

Other than just catching up e.g. allowing widgets be placed anywhere on the home screens rather than in a single column, we really need a complete redesign of the almost unusable multi-tasking setup.

It’s clear iPadOS needs to be closer to MacOS in offering a better way to run multiple apps at once, run background services, and other “power user” features. Despite the name of this blog, it’s now pretty rare I do any work on my iPad ☹️

Not holding my breath on getting fundamental improvements this year, but surely Apple must be completely rethinking how multi-tasking works? Why else would they break out the iPadOS name other than to make a significant break from iOS?

2. SwiftUI improvements

I really love SwiftUI, both the simplicity of building nice interfaces in code, plus the functional/reactive way it works.

However we really need the platform to become more mature this year. There are so many small but significant pieces missing, that often mean writing UIKit wrappers to achieve what should be built-in features.

Off the top of my head, things that have been painful for me recently include:

  • Text rendering - in particular using attributed text
  • Pull to refresh
  • Navigation - the current use of NavigationLink doesn’t scale at all well for more complex apps

3. More support for Combine

I’ve started using and learning more about Combine recently, and really like it. It obviously works really well in conjunction with SwiftUI, and can simplify many common patterns of app development.

However, it would be great if there were more built-in Publishers for other parts of the system. Casey Liss wrote a great article summarising his thoughts on this topic, and I couldn’t agree more.

With the forthcoming async/await support in Swift 5.5 - and having used this pattern in Flutter recently, I can’t wait for this - it will be interesting to see if Combine is continued to be extended by Apple, or if it becomes semi-abandoned in favour of newer technologies. I really hope not!

4. Interactive widgets

A no brainer this one. Widgets are great, and I use them extensively on both my iPhone and iPad.

Like everyone, I probably “over widgeted” my home screens when they first came out, but now have a good mix of useful widgets amongst my app icons.

However it seems obvious that adding some limited interactivity would make them even more useful. The common example given is play/pause buttons for audio widgets, and I can’t believe they won’t be implementable after this year’s OS updates.

5. Core Data replacement

We really need a replacement for Code Data for the modern age.

So many apps I work on follow a similar pattern - they interact with a server API that returns JSON data, tand we to cache on device for use when the user if offline.

On a recent project we used Realm for the local database storage. It wasn’t too bad compared with past experiences with Core Data, but we still ended up writing too much bolierplate code to manipulate the data from the API response into the correct types to allow it to be easily saved and retrieved offline.

Drew McCormack wrote a great article a few days ago about what he calls “SwiftData” - and I really recommend you reading it if you haven’t already.

I’m not sure about his thoughts on supporting decentralised databases, but having a simple database system that easily maps to say Codable structs, is extensible by default, and “just works” would be fantastic.

TBH I’m not holding out much hope for this, but any improvements to CoreData to match actual usage patterns I see in most apps would be very welcome.


I’ll update the scorecard after all the details are out of WWDC 2021, but I really hope at least 3/5 come true - and we get some exciting (not AR/VR!) new things to play with that I didn’t realise I needed!


Cross Platform Mobile Development Options (in 2021)

An update on what technology I'd recommend when developing multi-platform apps

A few years ago I wrote a post on my thoughts on cross-platform development mobile development options.

After a year of working on a large Flutter project, plus working on a much smaller React Native project recently, it seems like a good time to update my thoughts on cross-platform development options in 2021.


I’ve just completed a year long project for a large client helping rewrite their mobile apps in Flutter.

Neither I or the other members of the team had done much/any Flutter development before, so it meant learning best practices together - sometimes through trial and error, finding out what worked for our particular app.

I really enjoyed using Flutter, and it’s definitely the nicest cross-platform development system I’ve used so far.

Good Points

  • Uses a declarative UI (like SwiftUI) which is a productive, modern way of developing reliable and predictable user interfaces
  • Hot reload - not needing to recomplie to see every change in the simulator - is very nice when doing UI work
  • Visual Studio Code is a great and versatile development tool, with lots of handy extensions (I’d strongly recommend using it rather than Android Studio for doing Flutter development)

Less Good Points

  • Support for packages can be a little patchy
    • Flutter has support for most common requirements out of the box, or with Google written packages.
    • However for more specialised needs, several 3rd party packages we used weren’t of great quality, and we had to fix some fairly basic bugs in them. They were mostly packages developed by a single developer, and the owner generally didn’t have the time or inclination to keep them up-to-date or fix every bug found.
    • As ever with depending on 3rd party packages, use at your own risk
  • Using Dart was fine, but felt a bit limited compared to using Swift

React Native

I picked up a small React Native project for a new client, who wanted a few updates made to an existing app another agency had developed for them.

I was looking forward to using React Native, as I’d only briefly looked at it before - and to be fair haven’t spent enough using it to make a definitive judgement - but to be honest I was quite disappointed.

The app was using Expo, which offers a slightly clunky hot reload experience.

I also didn’t really enjoy going back to using JavaScript for mobile development, after using more suitable strongly typed and compiled languages.

I’ll hold judgement until I’ve done more RN coding (and it may be that the inherited codebase wasn’t well designed in the first place), but my first commercial experience of it wasn’t anywhere near as nice as developing in Flutter.


I’d definitely recommend using Flutter for the right projects. Those projects that are mostly cross-platform rich UIs without any complex on-device requirements are a good fit, as you are less likely to hit any issues with pany 3rd party ackages you need.

I can see how React Native might be a good fit for a team that already uses React in a web app, but unless that is you - or your team has strong front-end JavaScript skills already - I can’t see much advantage in using it.

3 years ago I mentioned using Xamarin and Cordova/Ionic, and I definitely wouldn’t recommend starting any new project using them any more.

However, I’ve started a a new project back using Swift/SwiftUI/native iOS development - and am VERY happy doing just that! SwiftUI in particular is a joy to use, and I am much more productive using it - even compared to doing Flutter development with it’s useful hot reload.

iOS Android Flutter React Native Cordova Xamarin

Strategy for automatically setting app version numbers

Auto-incrementing version numbers in apps using the number of Git revisions

One of the minor pain points for an app developer is managing app version numbers.

How I try to minimise the work needed when updating my apps is to automate this as much as possible, so I thought it would be useful to document how I do this, for my reference as much as yours.


Reusing the same version number across multiple targets

On iOS, if you have multiple targets in your solution, you need to ensure all the extensions have the same version number.

This can be quite a long list of things to keep in sync - for example, my Yeltzland app has 6 targets that need to have an identical version number (the app itself, Today widget, Watch app and extension, Siri intent and Siri intent UI)

I make this easier by having a user defined build property called "SHARED_VERSION_NUMBER" set at the Project level in Xcode.

User defined build property

I then use this variable in the Info.plists for each target as shown below.

Using the build property

Obviously this means I just need to update the version number in one place to automatically update it in all the targets.

Setting the build number

As I said above, I set the build number to be the number of Git revisions in the repo so far.

This guarantees a unique and incrementing build number for releases, and a informative number that helps when communicating with users about what version of the app they are running/testing.

I do this by adding a custom Build Phase to each of my targets that:

  1. Uses git rev-list --all --count to get the current number of git revisions in the repo
  2. Sets the ‘CFBundleVersion’ property in the Info.plist file to this number, using the PlistBuddy utility

Here’s the script I use:

git=`sh /etc/profile; which git`
appBuild=`$git rev-list --all --count`
/usr/libexec/PlistBuddy -c "Set :CFBundleVersion $appBuild" "${TARGET_BUILD_DIR}/${INFOPLIST_PATH}"


My Android apps are usually more straightforward, with a single build.gradle file used to set the versionCode and versionName for the app.

I use this simple build function in the app’s build.gradle to get the git revision number:

static def generateVersionCode() {
    def result = "git rev-list --all --count".execute().text.trim()
    return result.toInteger()

def majorVersion = "4.1.2"


android {

    defaultConfig {
        versionCode generateVersionCode()
        versionName "${majorVersion}.${generateVersionCode()}"

Code adapted from this Gist


I have a Xamarin iOS and Android native app - inherited from another company - so wanted to use a similar strategy for incrementing the build numbers.

This solution isn’t as nice - that can probably be said for Xamarin in general! - but it does work.

It involves manually adding build steps into the iOS and Android project files, that use the now familiar git command to get the build number we need, then using XmlPoke commands to set the values in either the iOS Info.plist or the Android AndroidManifest.xml files.

The pain is it changes the actual files in the repo - not just setting values at build time - so the Info.plist and AndroidManifest.xml files are continually being changed in the repo.

Below are what I added to my two project files for reference …

iOS Project file

<Target Name="BeforeBuild">
 <Exec Command=“git rev-list --all --count” ConsoleToMSBuild="true">
  <Output TaskParameter="ConsoleOutput" PropertyName="APPBUILD" />
 <XmlPoke XmlInputPath="Resources/Info.plist" Query="//dict/key[. = 'CFBundleVersion']/following-sibling::string[1]" Value="$(APPBUILD)" />
 <XmlPoke XmlInputPath="Resources/Info.plist" Query="//dict/key[. = 'CFBundleShortVersionString']/following-sibling::string[1]" Value="$(VersionNumber)" />

Android Project file

<Target Name="BeforeBuild">
 <Exec Command=“git rev-list --all --count” ConsoleToMSBuild="true">
  <Output TaskParameter="ConsoleOutput" PropertyName="APPBUILD" />
 <XmlPoke XmlInputPath="Properties\AndroidManifest.xml" Namespaces="&lt;Namespace Prefix='android' Uri='http://schemas.android.com/apk/res/android' /&gt;" Query="manifest/@android:versionCode" Value=“$(APPBUILD)” />
 <XmlPoke XmlInputPath="Properties\AndroidManifest.xml" Namespaces="&lt;Namespace Prefix='android' Uri='http://schemas.android.com/apk/res/android' /&gt;" Query="manifest/@android:versionName" Value="$(VersionNumber).$$(APPBUILD)" />


I’m very pleased I’ve got all this working (particularly in Xamarin), and I’d defintely recommend using an approach like this for your apps.

iOS Android Xamarin