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面试准备

iOS 面试题与答案

相关差异对比

Android vs iOS

问题 6. Tell the difference between atomic and nonatomic properties in iOS.

Atomic Property: It is the default property and ensures a valid value will be returned from the getter or set by the setter. This ensures that only one thread can access the getter/setter of a given property at a time and that all other threads must wait until the first thread releases the getter/setter. Despite being thread-safe, it is not fast, since it ensures that the process is completely completed.

Non-Atomic Property: With non-atomic properties, multiple threads can access the getter/setter method of a given property at the same time, so the potential for inconsistency between values exists. They come with enhanced access, but no guarantee of the return value.

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问题 7. What are different types of iOS Application States?

  • Not running: In the Not Running state, an application has either not been launched or has been closed/shut down by the system.
  • Inactive: A brief state of inactivity occurs while the app is leaving or entering its active state. Despite running in the foreground, it isn't yet ready to accept user input or events. This means that the application remains inactive at this time.
  • Active: The Active state indicates that the app is running in the foreground and receiving events. This is usually the normal mode for foreground apps and the User Interface is accessible.
  • Background: During this state, the application's user interface is hidden, but it continues to run in the background of the iOS system. Applications usually pass through this state prior to being suspended.
  • Suspended: In this case, the application is in the background but is not running code. However, it stays in my memory. Under low memory conditions, the system can delete apps in the suspended state without warning.

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问题 8. What is an iOS developer and what are his responsibilities?

  • The iOS developer should be skilled in two programming languages i.e., Objective-C and Swift.   
  • Clean, efficient coding for iOS applications.
  • Ensure clean and secure codes by performing troubleshooting and bug fixes for applications.
  • The development and deployment of advanced app features as well as the maintenance and improvement of existing features.
  • Develop innovative solutions to meet the business needs of customers.
  • Assisting with all aspects of application development, including design, testing, release, and support.
  • Exploring, evaluating, and implementing new technologies continuously to maximize development efficiency.

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问题 9. Tell the differences between Android and iOS.

Android: It is the mobile operating system for Android devices offered by Google LLC (limited liability company) and is focused on touchscreen mobile devices like smartphones and tablets. Several programming languages were used in its development, including C, Java, C++, and others. 

iOS: It is the operating system for Apple devices offered by Apple incorporation and it is considered the second most popular mobile operating system globally after Android. It is primarily designed for Apple mobile devices like the iPhone, iPod Touch, etc. Several programming languages were used in its development, including Objective-C, Swift, C++, and others. 

For more differences, please check here.

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问题 10. What are the programming languages used for iOS development?

Programming languages used for iOS development are:

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