Saifur Rahman

Hello. My name is Safur Rahman, and I have done my bachelor's in computer science in 2018. Then I got a personal job to work as an iOS developer, and I've been working as an iOS developer for the past around 5.4 years. So I've done projects around 14 to 13 projects, I've done where 9 are live. And I've worked in teams also. I've also worked as an individual. The largest team I've worked in is around 23 members. And I've done some projects alone and then also led some projects. So, in the domains I've worked in, social media, marketing apps, health apps, medical-related apps, AI, CoreML, speech recognition – all these things. And I'd say I'm more of a Swift enthusiast, and I also have experience in Objective C. I've done some projects in Objective C, but my main experience is in Swift. So I would say I'm a Swift enthusiast. And I use the MVVM pattern, and I'm learning SwiftUI now. But for now, I have been using the MVVM pattern for the past 2 years. So that was from my side.

To safely unwrap optionals, in SIP, we can use guard. We can use a switch. So guard will do what? It checks if the value is nil. It will return and not execute the next code. If let will also do the same thing. If let variable name equals the optional value, it will check for the value. And if the value is there, it will come inside the scope of if let. Else, it will go out of the scope. So this is the approach to safely unwrap options in Swift.

The architecture pattern which I'll be using is the MVVM pattern, model view model. MVVM is like the main entry point is the view model. We don't as soon as they, like, it is, first of all, it is scalable, maintainable, easy to load code, easy to write, easy to read, and easily understandable code. And it is easily scalable, easily maintainable. And when the entry point here is the view model, and the data is put into the model. As soon as the model's data changes, the UI itself updates. We don't need to update the UI again and again when the API comes and value comes, data changes. So it itself changes the UI. It updates the UI as soon as the model changes.

The best practice for managing memory when dealing with large collections of data models in iOS is, we should check that there are no retain cycles. We should use weak references instead of strong references. And, we should see that automatic reference counting is called ARC, and strong references are not there. So this is how we can manage the memory. We can check the memory management panel. We can check what the memory is using right now, how much memory it is using, and if there are any leaks or not. So all these things we can check for better memory management.

How can shift protocol oriented programming help in managing dependencies in an iOS application? In shift protocol-oriented programming, it helps in managing dependencies in our application. It is like, in the protocols. These are blueprints. So managing dependencies, like, as soon as we, through delegates and with the help of protocols, as soon as that protocol is assigned, as soon as that protocol is put into a class or something, all the functions which we want, all the dependencies, extra dependencies which we want in a class or something, so those are called. We can also go for a required method or an unrequired method. We can go for both. Like, if it's a required method, then if a protocol is there, then that method has to be there. If it is not required, then that function may or may not be there. It's according to the user. So this is how Swift's protocol-oriented programming helps in managing dependencies in an iOS application.

Key considerations when designing a reusable network clear in Swift. Key considerations. Well, for a reusable network, we can go for a singleton pattern where the class can be private, and we'll create a singleton class so that its instance is not created again and again. This way, memory is not used again and again, and the object isn't created again and again. So for that, we can use the singleton pattern. It is very helpful for a reusable network layer.

We can create a single new class for this position container dot view context so that again and again, we are not creating an object of this persistent container. And, if you use a singleton task, the app performance will be better, or else, the memory will be more and more, occupying more memory. So, we can use this singleton class here.

Has a view model dot fetch data is called inside the scope of dot and appears? So this might happen that the response from the API is not there, and we will be able to see the text field here. So the text field will be shown, but the data may be fetching at that time. So this problem may occur.

For first of all, we will say that G for GCD, it is called Grand Central Dispatch. It is for background tasks, first of all, and for background threads. Whatever task has to perform in the background and the UI shouldn't be hampered or crash. So the main thread should not be used while doing some background tasks. So we use this GCD for the background tasks. And when the response comes, we go to dispatch to main async. And after that, the way we can update the UI on the main thread. So, in this question, it is all about how to perform concurrent operations. In concurrent operations, what we can do is take, for example, we can do is take let some concurrent queue equals to dispatch 2, and give a label. The label name may be concurrent queue, and it attribute is concurrent. So when we took this concurrent queue, concurrent queue async, we perform one task. Let's say we have print inside something, print task 1 running. Then the scope of that async closes. After that, concurrent queue async. The scope opens, and we print some other task is running or task 2 or performance 2. So this is how it is done. And we can also do this with the completion handler also.

Secure data in iOS is, we can use the keychain to keep the data and, or, the best practice is to use the Keychain. And, second, we can do is, encrypt the data. We can, and we can encrypt the data. We can use, like, the crypto chip service for that. And, there are some data protection APIs also. We can make some data protection API for that. So, the best I know is we can use keychain for that, in which the data is saved in a secure container, such as a keychain attribute, account. All these things are used, and the data is saved inside the Keychain.

To ensure good quality, we can do unit testing, and proper documentation should be there. And CICD, we can use continuous integration and continuous deployment. For a day or half a day's work, we deploy it and integrate it into the main project, deploy it, and it's checked again and again. We can refactor our code regularly to improve performance and maintainability. So all these things can be done.