objective-c面试题
面试题 Objective
2023-09-14 09:00:29 时间
1.Difference between shallow copy and deep copy?深度拷贝和浅拷贝得不同是什么？
2.What is advantage of categories? What is difference between implementing a category and inheritance?
3.Difference between catego
1.Difference between shallow copy and deep copy?深度拷贝和浅拷贝得不同是什么？
2.What is advantage of categories? What is difference between implementing a category and inheritance?
3.Difference between categories and extensions?
4.Difference between protocol in objective c and interfaces in java?
5.What are KVO and KVC?
6.What is purpose of delegates?
7.What are mutable and immutable types in Objective C?
8.When we call objective c is runtime language what does it mean?
9.what is difference between NSNotification and protocol?
10.What is push notification?
11.Polymorphism?
12.Singleton?
13.What is responder chain?
14.Difference between frame and bounds?
15.Difference between method and selector?
16.Is there any garbage collection mechanism in Objective C.?
17.NSOperation queue?
18.What is lazy loading?
19.Can we use two tableview controllers on one viewcontroller?
20.Can we use one tableview with two different datasources? How you will achieve this?
21.What is advantage of using RESTful webservices?
22.When to use NSMutableArray and when to use NSArray?
23.What is the difference between REST and SOAP?
24.Give us example of what are delegate methods and what are data source methods of uitableview.
25.How many autorelease you can create in your application? Is there any limit?
26.If we don’t create any autorelease pool in our application then is there any autorelease pool already provided to us?
27.When you will create an autorelease pool in your application?
28.When retain count increase?
29.Difference between copy and assign in objective c?
30.What are commonly used NSObject class methods?
31.What is convenience constructor?
32.How to design universal application in Xcode?
33.What is keyword atomic in Objective C?
34.What are UIView animations?
35.How can you store data in iPhone applications?
36.What is coredata?
37.What is NSManagedObject model?
38.What is NSManagedobjectContext?
39.What is predicate?
40.What kind of persistence store we can use with coredata?
本书是iOS开发进阶的必读书籍之一。文中部分名词的中文翻译略坑，比如对block和GCD的翻译。其他整体还好，原作者写的比较用心。代码规范讲了不少，底层原理讲了一点点，且主要集中在第二章。
框架: 系统或者第三方事先写好的写很牛X功能的类，把这些类交给我们使用，这些类的集合就叫框架. Foundation框架: 是一个包，有很多类和函数，定义了一些数据类型.
自动释放池的原理 存入到自动释放池中的对象，在自动释放池销毁的时候，会自动调用储存在该自动释放池中的所有对象的release方法. 可以解决的问题: 将创建的对象，存入到自动释放池之中，就不再需要手动的release这个对象了，因为池子销毁的时候，就会自动的调用池中所有的对象release.
NSArray和NSMutableArray数组 存储数据特点:每个元素紧密相连，并且每个元素中都是直接存储的值. 缺点:数组元素下标不固定，都有可能发生变化，无法通过下标来唯一确定数组中的元素.
1.Difference between shallow copy and deep copy?深度拷贝和浅拷贝得不同是什么？
2.What is advantage of categories? What is difference between implementing a category and inheritance?
3.Difference between categories and extensions?
4.Difference between protocol in objective c and interfaces in java?
5.What are KVO and KVC?
6.What is purpose of delegates?
7.What are mutable and immutable types in Objective C?
8.When we call objective c is runtime language what does it mean?
9.what is difference between NSNotification and protocol?
10.What is push notification?
11.Polymorphism?
12.Singleton?
13.What is responder chain?
14.Difference between frame and bounds?
15.Difference between method and selector?
16.Is there any garbage collection mechanism in Objective C.?
17.NSOperation queue?
18.What is lazy loading?
19.Can we use two tableview controllers on one viewcontroller?
20.Can we use one tableview with two different datasources? How you will achieve this?
21.What is advantage of using RESTful webservices?
22.When to use NSMutableArray and when to use NSArray?
23.What is the difference between REST and SOAP?
24.Give us example of what are delegate methods and what are data source methods of uitableview.
25.How many autorelease you can create in your application? Is there any limit?
26.If we don’t create any autorelease pool in our application then is there any autorelease pool already provided to us?
27.When you will create an autorelease pool in your application?
28.When retain count increase?
29.Difference between copy and assign in objective c?
30.What are commonly used NSObject class methods?
31.What is convenience constructor?
32.How to design universal application in Xcode?
33.What is keyword atomic in Objective C?
34.What are UIView animations?
35.How can you store data in iPhone applications?
36.What is coredata?
37.What is NSManagedObject model?
38.What is NSManagedobjectContext?
39.What is predicate?
40.What kind of persistence store we can use with coredata?
本书是iOS开发进阶的必读书籍之一。文中部分名词的中文翻译略坑，比如对block和GCD的翻译。其他整体还好，原作者写的比较用心。代码规范讲了不少，底层原理讲了一点点，且主要集中在第二章。
框架: 系统或者第三方事先写好的写很牛X功能的类，把这些类交给我们使用，这些类的集合就叫框架. Foundation框架: 是一个包，有很多类和函数，定义了一些数据类型.
自动释放池的原理 存入到自动释放池中的对象，在自动释放池销毁的时候，会自动调用储存在该自动释放池中的所有对象的release方法. 可以解决的问题: 将创建的对象，存入到自动释放池之中，就不再需要手动的release这个对象了，因为池子销毁的时候，就会自动的调用池中所有的对象release.
NSArray和NSMutableArray数组 存储数据特点:每个元素紧密相连，并且每个元素中都是直接存储的值. 缺点:数组元素下标不固定，都有可能发生变化，无法通过下标来唯一确定数组中的元素.