Codable protocol in Swift 4 + extension

Frédéric ADDABlog, iOS

When Swift 4 went out and we finally had a chance to play with it in a playground, I began reading this article on Ray Wenderlich's site : https://www.raywenderlich.com/163857/whats-new-swift-4   I was particularly interested in this part about the new Codable protocol : [crayon-662a3b3bdd73f556494361/] As you can see, it's a pretty interesting (and simple) way to convert a Codable into a String (a stringified version of a JSON dictionary).   I also read this article from Natasha-The-Robot's weekly newsletter : https://cur.at/hxKamEa?m=email&sid=QSej7qn This is interesting: the author creates a new protocol (Serializable) to let the Codable-conforming object encode itself to Data. [crayon-662a3b3bdd74b850462478/]   Well, as far as I'm concerned, I often have to parse a JSON dictionary (a.k.a. a Dictionary<String, Any>), or create a JSON dictionary from an object, not a String or a Data. So, this is my implementation of this Serializable protocol idea : [crayon-662a3b3bdd750522538472/]   The JSONCodable protocol now has two required methods :

  • a function allowing the Serializable-conforming object to convert itself a JSON

Tagged , Read More

ZEN Speller (EN)

Frédéric ADDAApplication, iOS

For those of us struggling to write numbers in plain letters, Zen Speller comes to the rescue! Zen Speller shows how to write a number in plain letters, in different languages. This is particularly helpful to write down checks. You can also hear how this number should be pronounced. Privacy statement: this app collects NO DATA about you or the way you use this app. We don't use analytics, advertisement tracking or anything else.

Read More

A concrete example of the « guard » statement in Swift 2

Frédéric ADDABlog, iOS

Background

A lot of my recent project involve functions with completion handlers returning either an error, or an (optional) object. That's the case for most of CloudKit functions. Example: [crayon-662a3b3bdfed2270488450/] Or MapKit : [crayon-662a3b3bdfede755809763/] I'm still learning the new error handling in Swift 2, so I don't know if these completionHandlers returning NSError? still have a future. What I know is that the guard statement is quite helpful in this case. (suite…)

Tagged , Read More

Structure your UITableView better with structs and enums in Swift

Frédéric ADDABlog, iOS 9

In this post, I present a technique I use a lot when building a UITableViewController in Swift, but which I haven't seen used by many other people very often.

Background

This technique was inspired by this years's edition of the legendary Stanford CS193p on iTunes U (presented by the just as legendary Paul Hegarty) : iTunes U - Developing iOS 8 apps with Swift, and by this M2M site which for years now has specialized on giving unofficial solutions to the assignments (I suppose that Stanford students have a chance of having their work corrected, but there is no "official" solution to the assignments for the iTunes U followers). In this course, the 4th assignment dealt specifically with table views. Namely, one of the requirements was:
While you might be tempted to deal with this with large if-then or switch statements in your UITableViewDataSource and navigation methods, a cleaner approach would

Tagged , , Read More