Category Archives: iOS Dev

Version number comparison – the right way

Version number comparison is often needed during app development. Whether you’re checking for an app upgrade, file/payload version or something else, you need a reliable way to see if two version numbers are the same, or one is greater or lower than the other. In software development version numbers are usually formatted as major.minor[.maintenance/fix]. Usually developers use the String compare API provided in the iOS SDK, and pass the numeric option of comparison. This is simple enough, but unfortunately, it will not always work.

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WWDC 2017 overview

wwdc-2017A lot has been introduced at the WWDC 2017. Apple introduced iOS 11 with new and powerful features and APIs that allow developers to create apps using machine learning, augmented and virtual reality, accessing music and a lot more. iOS 11 has a strong emphasis on iPad introducing drag and drop, new Dock, file management, and multitasking improvements. Xcode 9 and Swift 4 were also introduced, bringing useful tools to developers.

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Appboy Rich Notifications Service Extension

appboy_logoiOS 10 brought rich content to push notifications. You can view an image, gif or video directly in the notification without first opening the app. This is achieved using notification service extension which intercepts remote notifications and allows your application to download and prepare appropriate rich content before it is displayed to the user.

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RxSwift AdMob delegate wrapper

AdMobRxSwift is a very powerful framework and a lot of components are already available but often you’ll find yourself in a situation where you’d have to implement your own reactive extension in order for certain component to work seamlessly with the rest of your reactive codebase. This is the case when you’re using third party SDKs or libraries that you’re interacting with using different delegate methods. I created a sample project to wrap AdMob banner and interstitial view delegates.

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Often used class name suffixes

wonderWhen you name a new class, you want that name to be meaningful and describe why this particular class exists and what it does. This is much harder than it seems. The name of a class usually consists of two components. The first part of the name is usually related to a domain, e.g. a feature name or a screen name. That one is pretty much given. The other part of the class name is related to a type of the problem it is trying to solve and it may be much harder to come up with a meaningful name for this. I found that when you’re in a “naming paralysis”, going through the list of some common suffixes is generally enough for that bulb to light up when you come across a name that you see fit.

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Protocol oriented programming in Swift

As I wrote in a blog post about Value vs Reference types, in Swift Enums and Structs are first class citizens. They contain properties, methods and extensions which are usually only found in Classes. Value types do not support inheritance in Swift, but they can conform to protocols which makes them convenient for use in Protocol Oriented Programming.

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Difference in value and reference type property setters

swift_logoSwift properties associate values to a certain class, structure or enumeration. There are two kinds, stored and computed properties. Stored properties are constant or variable values that exist in an instance. Computed properties do not store a value, instead they represent a value that is calculated from other values. Another difference between the two is that stored properties cannot be contained in enumerations. Classes and structures can contain both stored and calculated properties.

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Meaningful names

your_name_hereThere is an expression that states: “There are only two hard things in programming – cache invalidation and naming things”. More often than not, so little effort goes into naming things. We’re usually eager to start working on the “important” stuff as soon as possible so in a matter of seconds we make up a name that is going to be the first and most important point of contact for anyone looking into that particular part of the implementation. The name of a variable, function, class or any type should roughly tell you what it does, how it’s used and why it exists. That is why much more thought and effort should go into naming things.

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iOS Table and Collection View Cell info from nib

gridWhen creating UITableViewCell or UICollectionViewCell subclasses you usually need to define a few things both in xib and in code. First when you create the layout in the interface builder, you also define the reuse identifier for that cell. Implicitly for UITableViewCell and UICollectionViewCell you define the height/size. Automatically generated xib has the same file name as the name of the class. These are all things that you have to define in two places – one is the xib itself, and the other is in code.

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