Ios Interview Questions
iOS Interview Questions: Ace Your Job Interview with These Insider Tips
Ios Interview Questions
iOS interview questions typically cover topics such as Swift programming language, UIKit framework, design patterns, memory management, and application optimization. Some common questions include discussing the difference between let and var in Swift, explaining the MVC (Model-View-Controller) design pattern, demonstrating knowledge of memory management principles in iOS, and problem-solving scenarios related to performance optimization in iOS applications. Candidates may also be asked to explain their experience with using popular iOS development tools and how they handle common challenges in iOS app development.
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1 - What is the difference between atomic and nonatomic in Objective C?
Atomic is the default behavior for synthesized properties in Objective C, ensuring that access to the property is thread safe. On the other hand, nonatomic does not provide any guarantees about the property's access, making it faster as it avoids the overhead associated with thread safety. However, nonatomic properties are not thread safe and can result in data corruption if multiple threads try to access them concurrently.
2) Explain the difference between strong, weak, and retain in iOS memory management.
In iOS memory management, ‘strong’ and ‘retain’ are essentially the same and are used to indicate ownership of an object. When an object is assigned a strong or retain property, its reference count is increased, ensuring that it will not be deallocated as long as there is at least one strong reference to it. Conversely, ‘weak’ references do not increase the object's reference count and are used to prevent retain cycles in cases where two objects reference each other.
3) What is the difference between frame and bounds in iOS?
The ‘frame’ of a view in iOS specifies its position and size relative to its superview's coordinate system. On the other hand, the ‘bounds’ of a view defines its internal coordinate system relative to its own top left corner. This means that the frame takes into account the view's position within its superview, while the bounds do not.
4) What is the responder chain in iOS and how does it work?
The responder chain in iOS is a series of connected responder objects that have the ability to respond to user interactions such as tap gestures or keyboard input. When an event occurs, such as a tap on a button, the system determines the appropriate responder in the chain to handle the event based on the current first responder and the view hierarchy. If the current responder does not handle the event, it is passed up the chain to the next responder until it is eventually handled or ignored.
5) What is GCD (Grand Central Dispatch) and how is it used in iOS?
Grand Central Dispatch (GCD) is a technology in iOS that provides a high level API for managing concurrent operations. It allows developers to execute tasks concurrently and manage the allocation of system resources efficiently. GCD abstracts away the complexity of managing threads and queues, making it easier to write efficient, multi threaded code in iOS applications.
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