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Freelance Objective-C developer
Rishabh is a software engineer having 7+ years of experience in developing applicatins using Objective-C. He has knowledge of cross-platforms including UNIX, MacOS, Wndows, etc.
Freelance Objective-C developer
Mahesh is a software engineer having 3+ years of experience in developing mobile applications and softwares for OS X and iOS operating system.
Freelance Objective-C developer
John is a software engineer having 10+ years of experience developing applications for Apple manufactured devices and possesses vast knowledge of shell scripting.
Hire top talented freelance Objective - C developers with Ultragenius
Objective-C is an object-oriented language used for writing software applications for Apple’s iOS and OS X devices and is widely used by their frameworks Cocoa and Cocoa Touch. Objective-C is designed on the top of C Programming language with additional features of Smalltalk.
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Want to hire freelance Objective-C developers on your own? Here are the skills you must look for while hiring a freelance Objective-C developer
Hiring freelance Objective-C developers might be a complicated task for you if you are a non-technical manager. Objective-C is the required programming language used for writing applications for iOS devices – iPhones, iPads, iWatch, and many more. Objective-C has the embedded features of Smalltalk which means it is an Object-Oriented Language and can run applications 10 times faster as compared to Android applications written in Java. But, hiring the best freelance Objective-C developers among thousands of freelance developers is a challenging task for anyone. So, Ultragenius is here to assist you while hiring the top talented freelance Objective -C developers on your own.
The following skills you must ensure while hiring a freelance Objective-C developer –
Understanding of Object-Oriented Programming Concepts
Objective-C is an Object-Oriented Programming Language. Therefore, the freelance Objective-C developer must know about the four pillars of OOPS including Encapsulation, Inheritance, Abstraction, and Polymorphism.
Encapsulation – Encapsulation bundles the data along with member functions that operate on the data. It binds the data into a single unit.
Inheritance – Inheritance is the mechanism by which a class can extend the functionality of another class. Inheritance gives the freelance Objective-C developer an advantage to reuse the same code.
Abstraction – Abstraction enables data-hiding by showing the user only the necessary details and hiding the implementation details.
Polymorphism – Polymorphism is the ability of a function to take many forms. Polymorphism is of two types – Compile-time Polymorphism and Run-time Polymorphism. In Compile-time Polymorphism, the invoking method is decided by the type or number of arguments if there are multiple methods present with the same name. Run-time Polymorphism is achieved through Method Overriding. The child class provides the specific implementation of the parent class and the method invoked is decided at the run-time.
Objective-C Foundation Framework
The freelance Objective-C developer must know about the vast set of features like URL handling, data handling, error-handling, etc. that is provided by Objective-C. The foundation framework provides multiple extended datatypes like NSArray, NSSet, NSDictionary and comprises of a rich set of functions including that of string manipulation an file manipulation.
Familiarity with Objective-C protocols
There are two types of protocols used in Objective-C – Formal and Informal.
- Formal Protocols provide the list of methods which are implemented by client-classes. Formal protocols have their own type-checking, declaration, and adoption syntax. A formal protocol can also adopt other protocols.
- Informal Protocols is an NSObject category which creates all object adopters of a protocol. Here category refers to add functions to any class without sub-classing it.
Knowledge of Categories
Categories provide the freelance Objective-C developers the ability to add a specific functionality to a class without sub-classing it. A category is a very useful tool as the developers can add their own created methods to an object.
Experienced working with code versioning tools like Git, SVN, TFS
Freelance Objective-C developers must have a very good knowledge of version control systems, like Git, SVN, TFS, and Mercurial. Mostly, developers use Git for their work. It is the version control system that helps the team in collaborating and organizing your code, maintain the frequent changes that occur in the code. Git helps in reviewing the old codes and compares them with the newly updated code, pulling the code from their repository, and managing the commit history.
Along with this, the freelance Objective-C developer must know how to use add, push, pull, and commit commands, how to do branching, and merging as it allows developers in different field to work independently on the code.
Knowledge of Objective-C extensions
Objective-C provides the extension facility through which freelance Objective-C developer can add private variables and private methods that are class-specific. Any variable or method declared inside an extension is hidden and cannot be accessed even by the child class. Only the classes with original implementation of source code can declare extensions.
Familiarity of Objective-C Runtime
The freelance Objective-C developers must know about Objective-C module APIs that includes Objective-C functions and run-time and support its dynamic functionalities. These run-time APIs include types like NSObject and NSObject Protocol which forms the core property of any class.
Strong understanding of data structures and algorithms
Knowledge of data structures and algorithms enables a freelance Objective-C developer write meaningful and concise code. You must check that the freelance Objective-C developer must know about binary trees, foundational sorting algorithms like quick sort, merge sort and insertion sort. The freelance Objective-C developers must know about map, set, vector, trees data structure.
Knowledge of Blocks
Blocks are the additional features provided by Objective-C that allows a freelance Objective-C developer to create distinct code segments which can be passed as values to methods or functions. Blocks in Objective-C have the ability to take values from enclosing scope and make them equivalent to lambda expressions in Java/Python or Closures in Haskell. Blocks can be added just like NSDictionary and NSArray collections.
Knowledge of Posing
Objective-C provides the freelance C developers a feature to replace a class completely with another class. The replacing class is “posed as ” the target class. In such case, the posing class receives the messages that are sent to the target class. NSObject contains the poseAsClass method that replaces the entire existing class.
Knowledge of Pointers
Pointers are used in Objective-C to perform tasks like dynamic memory allocation which can’t be done without using pointers. Every variable is an allocated memory and has a unique address associated with t. The address of the memory location can be accessed using & (ampersand) operator. General pointer variable declaration syntax – type * variable_name;
Excellent Problem-Solving Skills
The freelance Objective-C developer must have a strong problem solving skill because it helps developers to utilize existing solutions for the projects more efficiently, thinking abstractly, and enables them to write pseudocode for their project. The developer must know how to debug the code as well. Also, check if the freelance Objective-C developer is able to write clean and concise code so that other team members can understand it easily.
Experience working with Xcode IDE
Xcode IDE is mainly used for developing iOS applications for Apple devices like iPhones, iPads, Mac, etc. A freelance Objective-C developer must be proficient using Xcode and building interactive interfaces and knowing well how to combine them with the Cocoa Touch Framework which is popular for developing applications and allowing to work flawlessly on various Apple services like Game Changer, Passbook, etc.
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Objective-C is a dynamic programming language which is built on the top of C programming language and has added features of Smalltalk and is therefore an Object-Oriented Programming language. Objective-C is used by Apple’s operating systems OS X, macOS and iOS. But, recruiting the top talented freelance Objective-C developers among thousands of developers is a difficult task when there is a huge competition among developers to grab the job opportunities.
Top Interview Questions to ask while hiring a freelance Objective-C developer
A protocol states a programming interface that a class decides to implement or not. Protocols establishes communication between the classes through inheritance. There are two types of protocols defined in Objective-C -
- Formal Protocol - A formal protocol declares a list of several methods that a client class is expected to implement. Formal protocols possess their own type-checking syntax, declaration, and adoption. The methods under @required keyword must be implemented in the classes which sends confirmation to the formal protocol. The methods under @optional keyword are optional to implement.
- Informal Protocol - Informal protocols are categories of NSObject, which creates all object adopters of the protocol implicitly. Before invoking a method, the calling object verifies whether the target object is going to implement it or not. Implementation of the informal protocol's methods are optional.
The import keyword is a superset of include and ensures that a file is included only once. #include includes all the functions, and algorithms related to that particular library.
Categories provides the feature of adding a specific functionality to a class making its sub-class. The added methods are derived by the sub-classes and cannot be distinguished from the original methods of the parent class. The developers can also use categories to distribute the classes implementation into separate source files.
NSArray is the super-class of NSMutableArray which handles ordered collection of objects known as arrays. NSArray is responsible for creating static arrays while NSMutableArray creates dynamic arrays.
Fast Enumeration is the mechanism that helps in enumerating through a collection. There are various types of collections which are responsible for efficiently storing and retrieving objects.
Grand Central Dispatch (GCD) is a robust technique to perform tasks efficiently in Objective-C. GCDs are the dispatch queues which lets freelance Objective-C developers execute arbitrary code blocks either synchronously or asynchronously. GCDs can perform all the tasks that you perform using several threads.
The advantages of GCDs over NSThread are -
- GCD lessens the memory consumption that an application requires for storing thread stacks in the app's memory.
- GCD eliminates the need of code required for thread creation and configuration.
- GCD eliminates the requirement of managing and scheduling work on threads.
- Using GCD-type locking is about 80% faster as compared to @synchronized in NSThread.
Blocks are the additional features provided by Objective-C that allows a freelance Objective-C developer to create distinct code segments which can be passed as values to methods or functions. Blocks in Objective-C have the ability to take values from enclosing scope and make them equivalent to lambda expressions in Java/Python or Closures in Haskell. Blocks can be added just like NSDictionary and NSArray collections. The syntax to define a block is :
NSLog("@This is an example of block.");
The responder chain is a series of events that takes palce once we start interacting with the iOS phones. A responder chain starts with the first responder object and ends with the app object. If the first responder cannot handle the event, it forwards / resends that event to another responder in the chain.
Frequently Asked Questions
Ultragenius is one of the leading platforms for hiring remote talent and connecting freelance and part-time developers with Silicon Valley businesses. We focus on finding the best talents who will perform extremely well and will be easily integrated into your teams. We filter out only the top 1% most skilled freelance developers among the 20K+ developers who have applied on our platform. Candidates have to prove their self-reported experience by giving Ultragenius’ s skill tests.
Ultragenius first tests the developer’s skill set by conducting a two and half hour hiring test. Our hiring test judges a candidate on all aspects like aptitude, case study analysis, verbal and reasoning, coding questions based on data structures and algorithms, software engineering, system design, and more. Then, there is another round for the candidates who are selected from this round called “Higher-level Assessment Skill Test”, which is a video round that deeply analyzes freelance developers’ major skills and asks questions about the projects they have worked upon.
Fill up the form which is on every hiring freelancers’ page and we will inform you once we select the top 1% freelance Objective-C developers matching your job requirements. After analyzing the candidates based on their resumes and two assessment tests, we provide you the feedback quickly. And if the freelancers selected by our team are fit for your job role, then we also provide the onboarding.
Ultragenius offers you only the most skilled freelance developers who are top 1% among the 20K+ freelance developers who have applied on our platform. After a rigorous selection and testing process, we sort out only the top candidates for you. You can check out Ultragenius’ s selection process for hiring freelance Objective-C developers on https://www.ultragenius.club/hire-objective-c-freelancer/.