![]() Most of the instructions that make up your app run sequentially on a single core, even on modern CPUs with multiple cores. Blocking the main run loop for too long makes your app unresponsiveĪ CPU can only process instructions sequentially. But that’s not how computers work, and this is where asynchronous functions are helpful. To the user, all of these changes appear to happen simultaneously. As a consequence, what appears on the screen must be updated to reflect the new app state. The code changes the app’s internal state by affecting its data or the state of its user interface (for example, by changing the scrolling position of a list). When the user interacts with the app or input is received from the device’s sensors, an event is triggered, and code gets executed. Most of the time, the app is idle, waiting for input. However, the nature of iOS apps is different, and they are not as exact. Even if you split a large program into functions organized in structures or classes, the code will always run in the same sequence. When you learn Swift for the first time, your programs run from start to finish. Why do we need asynchronous functions in iOS apps? Async/await, completion closures, and Combine.Creating tasks to run asynchronous code in Swift and SwiftUI. ![]() How to use asynchronous functions in Swift. ![]()
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