There are four types of in-app purchases in Apple’s App Store, with their own unique ways to manage it. The challenge is how to isolate the intricacies of these product types from the rest of the application. Otherwise a move from non-consumable in-app purchase to a subscription type would involve a major rewrite. Learn how to manage an app’s inventory of purchases and get the code base resilient to changes in the business side.
What if you need to create a “holiday special” in-app purchase? The item would only be available at a limited period some time in the future. However those who have bought the item would be able to use it beyond the purchase-able period, including restoring purchases should they need it.
I want to let some non-consumable iAP items just be sold during a particular period of time. Also the user who purchased these items still can restore and use it after the time period has elapsed.
Creating time-based in-app purchases (iAP) can be difficult. First all iAPs would need to go through App Review, hence they would need to be available before your app is live. Second is that there’s practically no way for the app to differentiate the app review environment versus the actual production environment – nor does Apple want you to.
But what if I say it can be done? What if you can have a non-consumable iAP, pass it through app review, and only made it for sale only during a specific period in the future? Interested? read on.
Do you distribute your macOS apps as .zip files? That has been quaint since Sierra. You should package your apps as signed and notarized disk images instead. Otherwise Catalina would say that your package is suspicious. However creating disk images is a rather involved process. Read on to find out more.
Distributing macOS apps within .zip files nowadays is no longer a good idea. One issue is app translocation. Another issue is the mandatory notarization starting from macOS 10.15 Catalina.
App translocation goes into effect when the user downloads a .zip file containing an application, extracts it, and runs it directly without moving it anywhere using the Finder. The operating system would run your app from a temporary read-only disk image created just for the purpose of launching your app. This has an unfortunate side effect of Sparkle being unable to update your app – which prevents you from delivering updates and bug fixes seamlessly to your user.
Notarization is the method to register your software packages to Apple when you distribute outside the App Store. The problem with packaging software inside a .zip file comes from the inability to attach the notarization result on to the archive. Therefore your user’s system would need to be online to check whether your software package has been notarized. Otherwise it would prompt a “macOS can not validate…” warning to the user, possibly causing suspicion to your package. However when the notarization result is stapled to your package, macOS can validate it without making a network connection to Apple.
Thus disk images is probably the best way to distribute application bundles outside the Mac App Store. Disk images can be signed, notarized, and stapled. When you distribute apps using disk images and Sparkle, your users would find it straightforwardly effortless to install, use, and update.
But creating disk images is an involved task for the developer. There are so many tasks involved to package an application into a disk image ready for the user. This includes:
Creating a blank read/write disk image for scratch-pad purposes.
Copying the application bundle inside the disk image.
Creating a symbolic link inside the disk image to the /Applications folder.
Setting a background image for the disk image’s Finder window to instruct the user to install the application bundle.
Use the Finder to carefully arrange the icons of the application bundle and the symbolic link to the /Applications folder to the background image, as well as any other additional content in the disk image.
Convert the scratch-pad disk image into a compressed read-only disk image.
Sign the disk image.
Upload the disk image for notarization.
Wait for notarization to complete.
Staple the notarization ticket on to the disk image.
That’s a lot of steps to do manually on each release. Thankfully all of those steps can be automated and added to your continuous integration environment. Hence you can automatically get a finished disk image on every release. Even if you don’t have a build server, integrating this to your Xcode build would be a snap. Read on to learn how to do this.
There are four types of in-app purchases in Apple’s App Store, with their own unique ways to manage it. Learn how to manage an app’s inventory of purchases, get the code base resilient to changes in the business side, and tips on how to implement some more esoteric business models as in-app purchases.
Writing a web app is one thing. Deploying it on the global Internet for millions of users is another thing. Keeping it secure from prying eyes, competitors, and general baddies is yet another challenge. How can you do all of this in a startup where there are a billion of other things in your head beyond running a site?
The data persistence stack that is an appropriate decision today may not be an optimal solution when your app has grown. You would need to design your app to withstand the test of time and be extensible for as it grows. Read more to learn how.
How do you sell a watchOS app? Through in-app purchase of course, like these fine apps have done. However there’s a caveat condition that you need to guard for, otherwise you risk having angry customers.
macOS Catalina is just around the corner and with it comes mandatory notarization and hardened runtime. If your mac app accepts plugins or otherwise loads 3rd party frameworks and libraries, there are a few caveats that you’ll need to take care.
Are you an iOS developer who believes that making icons is purely witchcraft? Perhaps you have an inkling to be able to do some of that wizardry yourself? Here is a step-by-step process on how to create icons for tab bar buttons as well as other glyphs. Techniques that you would find useful for those times when you don’t have access to a good graphic designer.
As a developer often you would need to create visuals for others to use. Whether it’s to explain ideas, to inform colleagues, or maybe to include in the software itself. Here is a comparison of the two graphics packages that I use as a developer and content creator.