Category: Possibly useful

  • Regex to split a string with two different characters

    I’m working on the behaviour tickets app, and wanted a visually functional version to share with stakeholders this week to get some feedback. As usual in this situation, I’m pressed for time so feeling the pressure to take some liberties with code quality that I’ll come back and fix one day. In a salient lesson…

  • Copying a file via SSH

    I have a Raspberry Pi on my home network that I purchased for some project that I can’t actually recall. It gets used for all sorts of completely unnecessary things such as playing with node.js or a private git server. To add to the list of things that I do on pi that could be…

  • Mock Data

    One of the things we need during app development is some data to play with. It would be unethical for me to use real student data to test my app, even if I wasn’t sharing screenshots of the development here, so I’ll need to build some mock data. The prospect of making 400 rows of…

  • iOS 16 Developer Mode

    I updated my iPhone to iOS16 this morning, and tonight when I went to run one of my apps, it complained that it needed Developer mode. This is a new, probably wise, way to avoid dodgy apps being loaded on a phone. I don’t know exactly how you’d do that, but then I’m not a…

  • git stash

    When I was writing the blog post for the last project, I needed the “before” code to paste into the post. I’d committed that code, so a quick way to go back without losing my changes. I hadn’t committed the new code, so there is a super easy way to accomplish this. This grabs the…

  • git – Rollback to last commit

    I’m on Project 12 of the #100Days course, and like a number of earlier “projects” it’s not really a project, but a series of type-along tutorials. Often these have the same format – there’s a base amount of code to provide the setup, then this base is used to try each of the tutorial techniques.…

  • @Binding – data between views

    In C world, if we want to pass a parameter down into a functional call, and allow the receiving function to change it’s value, we’d pass a pointer to the variable. Something like this: For youngsters, what’s happening is that we’ve set the value of a to 5, then passed the memory address of a…

  • Codable when the keys don’t match

    A common issue when working with JSON that you vacuum up from internet APIs will be that the key names in the JSON don’t match your property names. The JSON de facto standard of using snake_case in key names could be one cause, or perhaps you just take variable naming more seriously than the person…

  • Codable & JSON

    If we mark a type with the protocol Codable, we’re specifying that this type has the capability of having it’s properties encoded to some format, and decoded back again. So far in the #100Days this has been used to write and read data in UserDefaults, and to encode an object to send it as a…

  • Refreshing SwiftUI Views

    SwiftUI does some property wrapper magic to (very efficiently) refresh your views, but what if you want to force a refresh for some reason? Here’s the techniques I’m currently using to do that. The tricks are below, but just so you can see them in context, here’s the sample app we’re working on. It’s a…