Why does Apple prefer to use Value types by default: Apple encourages the use of value types by default in Swift for several reasons. While reference types (classes) have their place and are essential in certain scenarios, value types provide several advantages that align with Swift’s emphasis on safety, predictability, and performance. Here are some…
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We can categorise types into two main groups: Value types and Reference types in Swift. The distinction between them is crucial because it affects how data is managed, copied, and passed around in your code. 1. Value Types: Examples: Structs and Enums Characteristics: Instances of value types are copied when they are assigned to…
Arrays and sets are both collection types in Swift, but there are some key difference between Array and Set in terms of their characteristics and use cases. Array: Ordering: Array: Elements in an array are ordered and have a specific index. Accessing Elements: You access elements in an array using their index, which starts from…
In this comprehensive tutorial, we will try to cater to Top iOS Interview questions and Answers. We aim to address key iOS interview questions and provide insightful answers to assist you in thorough preparation and effective revision for your upcoming interview rounds. Q.1 What are value types and reference types in Swift and When to…
Mastering Singleton in Swift is key in iOS development interviews. In this tutorial, we’ll break down common interview questions about Singletons, covering everything from implementation details to real-world use cases. Get ready to confidently handle Singleton-related questions and level up your iOS interview game! Q.1 What ia a Singleton in Swift? Ans. The Singleton in…
When preparing for iOS interviews, it’s crucial to focus on Swift initializers, as they often become key discussion points. Being well-prepared for these questions is essential, as they are commonly asked and can significantly contribute to your success in iOS interviews. Initializer in swift An initializer in Swift is a special method used…
Q.1 What is an associated type in Swift, and why is it useful? Ans. An associated type in Swift allows you to define a placeholder for a type in a protocol, and the concrete types that conform to the protocol will provide the actual type that fits in that placeholder. Associated types make protocols more…
2D array in Swift examples Q.1 Given a matrix find row-wise sum. Sol> var matrix = [ [1, -1, 4, 3], [2, 6, -1, -2], [6, -1, 0, 3] ] func rowWiseSum(matrix: [[Int]]) { for row in 0..<matrix.count { var sum = 0 for col…
Q. What are User Defaults? Ans. UserDefaults in Swift is a class that stores small amounts of data such as user preferences and application settings. We can store preferences like the user’s favourite color or save state like “user has activated button”. It allows us to save and retrieve data in key-value pairs, similar to a…
Problem When trying to build with XCode 15 getting the following error- “Cycle inside MyApp; building could produce unreliable results.” It is working fine with XCode 12, 13 and 14 Solution: Follow the below steps. Select Target Goto Build Phase tab. Drag ‘Embed App Extension’ and place it below ‘Run script’. Run it again, It…
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