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For testing, I needed to generate a list of data values randomly and put them into the models for further use. But I found out that there is no library, which could produce such functionality.
The elegant solution I expected to find had to combine such simple things as:
the variety of data;
the variety of methods to reach this data;
the possibility to change the default data set to the custom one.
Since I hadn't found the accurate solution, I decided to create my own library (ref. https://github.com/codeitua/ios-data-factory).
There were implemented all necessary methods for data generation (including random names, cities, addresses, dates etc) and data retrieve. And moreover, it has "swifty" interface, which provides comfortable use in every project.
I hope, it will be helpful for everyone, who faced the same problem as me!
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In my app the user should be able to search other users that are stored in Firebase. Pretty much like Instagram for example. Tragically I found out that this is not quite possible in Firebase yet. Most of the posts I found about this were older, so was there anything added that could help me out here?
I thought about this:
Right now I have stored all`users with their information. When starting the app I could retrieve all usernames and store it in a variable and then work with that. But this is rather brute force approach... I figure I am not the only one with that problem, so does anyone know what I can do here?
I hope this question is conforming all guidelines, correct me if not.
If Firestore isn't adequate for the kinds of queries you want to perform, your only real alternative is to duplicate that data into another database that can do it.
You will have to come up with some options on your own, as requests for offsite software products are off-topic for Stack Overflow.
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I'm learning Swift and I have a question about data model or the Model folder in Xcode. During a project 'Quiz app' we opened a new swift file in Model folder and started to write some code in it.
What is Data model and why instead of writing all the code just in the ViewController file we need to write a separate one in the model folder?
You could, technically, have all the code for your app in a single file. But it would quickly become really hard to find somethig and keep it readable. Also, when working in bigger teams, having a lot of code in few files results in merge conflicts, which could quickly get out of hand.
It is simply a good practice to keep all your classess in separate files, grouped in folders.
As for what a „data model” is - it’s just a representation of your domain problem in code. These classess will most likely represent data you retrieve from web, or create in app to perform some further operations on them or to use them as input for views to present them to the user.
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I'm currently working on an app that needs to communicate with a secure system. I need to generate a public and private key according to a couple of requirements. According to system specs, the key derivation iterations is required to be set to 1000, but I can't find any way to do this on iOS.
Can anyone help me out? Thanks!
As stated in comment, your question is a bit too broad. I am guessing that you are asking about PBKDF2.
You can use CommonCrypto to do that. I used it with Objective-C and it was relatively easy. I think there might be some difficulties to use it with Swift, but Google search has a lot of info how to do that.
You will need to use CommonCrypto function CCKeyDerivationPBKDF - link to docs. There is a round parameter which I think is what you are looking for.
This question might help too.
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I want to build an iOS application where you can easily view and interact with geophysics data (well logs, seismic sections etc), which usually come as huge matrices in SEGY format or similar.
Is there any way I can do this with swift? Also I need to extract statistics and and perform mathematical operations. Is there any scientific use of swift at all?
Sorry if I'm being vague, it's a fairly new idea and I would love to do it on iOS instead of using C/matlab/python etc.
There's nothing native to Swift, but you could always use third party frameworks for anything.
Of course, science power of Matlab won't be achievable by iOS, since the language is not intended for that, so you'll have to write some math functions on your own.
For charts, I used CorePlot, but now there's a better alternative written completely in Swift, called ios-charts.
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I want to create a searchable database in Xcode - for example, of different trees. The database would consist of the tree name, two images, price, and a short description. What is the best and most efficient way of creating such a database?
I am aware of: Core Data, SQLite3, and Parse. I am leaning towards SQLite3 but have not found a good place to learn how to implement this. Any suggestions?
Seeing as you are new to Objective-C and I doubt this will evolve into something need direct SQL I would suggest using CoreData. Although it is not technically a data base it is an object graph, it is built for exactly what you are wanting to do. Apple was even nice enough to build wrappers for everything you want to do.
CoreData to store your tree name, two images, price, and a short description.
NSFetchedResultsController for grabbing it.
UISearchBarController for letting the user search.
You would want to use Parse if you wanted to save your data to a server. If your doing everything locally I wouldn't worry about Parse. CoreData is what you want.