Touchstone Enterprises Interview Questions and Answers

UITableView for displaying data in a list format, UICollectionView for displaying data in a grid or custom layout.

• Use UITableView for displaying data in a list format, such as a contact list or a news feed.

• Use UICollectionView for displaying data in a grid or custom layout, such as a photo gallery or a calendar.

• UITableView is simpler to implement and more efficient for displaying large amounts of data.

• UICollectionView offers more flexibility in terms of layout and customizati...read more

I have worked on MVVM architecture in my previous project.

• MVVM stands for Model-View-ViewModel.

• It separates the UI logic from the business logic.

• The View interacts with the ViewModel, which in turn interacts with the Model.

• I used RxSwift for binding the ViewModel and View in my previous project.

Lazy property delays the initialization of a property until it is accessed for the first time.

• Lazy properties are useful when the initialization of a property is expensive and not always needed.

• They can improve performance and memory usage by delaying the initialization until it is actually needed.

• They are declared using the 'lazy' keyword and must be variables, not constants.

• Example: lazy var myProperty = expensiveInitialization()

• Lazy properties are thread-safe by default in...read more

Bounds refer to the content area of a view, while frame refers to the position and size of a view within its superview.

• Bounds are relative to the view's own coordinate system, while frame is relative to its superview's coordinate system.

• Changing the bounds of a view affects the position and size of its subviews, while changing the frame affects the position and size of the view itself.

• For example, if a view has a frame of (10, 10, 100, 100) and a bounds of (0, 0, 80, 80), the...read more

Access control refers to the process of restricting or granting access to resources based on user identity and permissions.

• Role-based access control (RBAC) - access is granted based on the user's role within an organization

• Attribute-based access control (ABAC) - access is granted based on specific attributes of the user, such as job title or department

• Discretionary access control (DAC) - access is granted at the discretion of the resource owner

• Mandatory access control (MAC) -...read more