iOS 面试题与答案

问题 46. What are the essential certificates for issuing and developing apps, either Android or iOS?

The certificate types are:

1. Development Certificate
2. Distribution Certificate 
3. Development and Distributing Certificates 

问题 47. What is ‘assign’ in iOS?

In iOS, ‘assign’ is used to create an orientation from one object to the other without raising the retain count of the source object.

问题 48. Why is 'reuseIdentifier' used in iOS?

The ‘reuseIdentifier’ is used to group all the similar rows from UITableView.

问题 49. How can you reduce the size of the App?

The three different methods to reduce app size are:

1. Bit code
2. On-demand Resource
3. App Slicing 

问题 50. What is MVC? Tell about its implementation in iOS.

MVC (Model View Controller) is a design pattern that defines how logic will be separated when the user interface is implemented. In iOS, UIView is the base class provided by Apple for all views, and UIViewController is provided to support the Controller, which listens to events in a View and updates it when data changes.