Suleman Ali’s Post

Mastering Grand Central Dispatch (GCD) and Operations in iOS Swift 102 What is Grand Central Dispatch (GCD)? GCD is a low-level API provided by Apple that enables developers to execute code concurrently. It manages the execution of tasks on different threads, allowing for efficient use of system resources. With GCD, you can perform tasks in the background while keeping the main thread free for user interface updates. Key Concepts of GCD: Dispatch Queues: GCD uses dispatch queues to manage tasks. There are two main types: Serial Queues: Execute one task at a time in the order they are added. Concurrent Queues: Execute multiple tasks simultaneously. Main Queue: A special serial queue that runs on the main thread. It’s used for UI updates. Global Queues: Concurrent queues provided by the system for tasks that don’t require a specific order. Basic GCD Example Here’s a simple example demonstrating the use of GCD to perform a task in the background: ``` import Foundation // Function to perform a time-consuming task func fetchData() { print("Fetching data...") sleep(2) // Simulating a network call print("Data fetched!") } // Dispatching the fetchData function to a global queue DispatchQueue.global(qos: .background).async { fetchData() } // This will execute immediately on the main thread print("This prints while data is being fetched.") ``` In this example, fetchData() is executed on a background queue, allowing the main thread to remain responsive. #iOSDevelopment #Swift #GCD #Operations #Concurrency #MobileDevelopment #iOS #SwiftUI #CleanCode #CodeQuality #AppPerformance #MobileApps #TechTips #Programming #Developer #SwiftProgramming #Xcode

Mastering Grand Central Dispatch (GCD) and Operations in iOS Swift 105 Advanced Operations Features Operation Dependencies: You can create dependencies between operations. ``` class ProcessDataOperation: Operation { override func main() { guard !isCancelled else { return } print("Processing data...") sleep(1) print("Data processed!") } } let fetchDataOperation = FetchDataOperation() let processDataOperation = ProcessDataOperation() processDataOperation.addDependency(fetchDataOperation) operationQueue.addOperations([fetchDataOperation, processDataOperation], waitUntilFinished: false) ``` Cancelling Operations: You can cancel operations and check their status. ``` fetchDataOperation.cancel() ``` #iOSDevelopment #Swift #GCD #Operations #Concurrency #MobileDevelopment #iOS #SwiftUI #CleanCode #CodeQuality #AppPerformance #MobileApps #TechTips #Programming #Developer #SwiftProgramming #Xcode

Exciting times for Swift developers! At WWDC 2024, Apple introduced Swift 6, marking a significant milestone in the language’s evolution. With a focus on data-race safety, Swift 6 enhances code safety and maintainability, ensuring that your apps are robust and reliable. Compile-time data-race safety: This feature helps identify and prevent data races, making concurrent programming safer and more predictable Swift 6 is not just an update it’s a leap forward in making Swift more powerful and developer-friendly. Whether you’re migrating an existing app or starting a new project, Swift 6 is the way to go. #Swift #WWDC2024 #Swift6 #AppleDeveloper #ProgrammingLanguages

In my latest article, I show how to adapt a Dependency Injection solution for real-world iOS projects, focusing on flexibility, testability, and scalability. Learn how to manage dependencies effectively and implement mock injections for clean unit tests. Check it out here. #iOSDevelopment #DependencyInjection #Swift #MobileDev #UnitTesting

Let's discuss the difference between Any and AnyObject in Swift ->> "Any": •It can hold values of any type, including non-class types like integers, strings, arrays, etc. •Sacrifices type safety for flexibility •Used for cases where we must work with various data types within a single variable. •Type checks are not enforced at compile-time, which might lead to runtime errors. "AnyObject": •Specifically used to hold instances of class types. •It offers more type safety than "Any" because it's limited to class instances. •Commonly used in scenarios involving Objective-C interoperability or when dealing with class instances. ̐•Compatible with Swift's memory management mechanisms and provides more predictability compared to "Any." We can use "Any" when we need flexibility with various types and are willing to manage potential type-related runtime errors. We can use "AnyObject" when working with class instances, especially in contexts where Objective-C compatibility is required. It's always better and good practice to be specific with the types expected in our code to clarify our code and maintain better readability. #ios #iosdevelopment #LinkedinLearning #swift

Keypaths in Swift are not only significantly slower than direct access but can also lead to crashes in runtime. Besides, you can get a runtime crash not because you use Keypaths yourself, but, for example, because of some features implementation in the library. I once encountered this problem while using RxSwift. The picture below shows the code and one of the possible fixes. And yes, this is a long-known bug without a fix, more details: https://lnkd.in/e45XfrRJ UPD: Pure Swift example: // Code from https://lnkd.in/e8d4vJfm class FloatObject { var property: Float! func test() { let k1 = \FloatObject.property // OK let k2 = \Self.property // Fatal error: could not demangle keypath type from '�����XD' } } FloatObject().test() #Swift #Xcode #Apple #bug #mobiledevelopment #appdevelopment #iosdevelopment #iosdev

Swift 5.10 Nested Protocols! 🎉 I'm thrilled to share an exciting update in Swift 5.10: Nesting protocols within non-generic struct/class/enum/actors, and also within functions that do not belong to a generic context is now possible! This enhancement simplifies and organizes code, making it more intuitive and maintainable. Here’s a quick rundown of what this means and how you can take advantage of it. What’s New? Nested Protocols: You can now define protocols directly within the scope of your structs, classes, enums, and actors with the exception of generic contexts, as well as within functions that are not in a generic context. This brings more encapsulation and clarity to your code. Why This is Awesome: Improved Organization: Keep related protocols close to where they are used, making the codebase easier to navigate and understand. Encapsulation: Better encapsulation of protocol definitions, ensuring they are only accessible where they are needed. Cleaner Code: Reduces global namespace clutter, making your global scope cleaner and more manageable. Reference: https://lnkd.in/gDmn6Hka #Swift #Xcode #iOSDevelopment #Swift5

protocol usage in Swift language