{"id":3476,"date":"2017-11-22T12:17:31","date_gmt":"2017-11-22T16:17:31","guid":{"rendered":"https:\/\/www.freelancinggig.com\/blog\/?p=3476"},"modified":"2017-11-22T12:17:31","modified_gmt":"2017-11-22T16:17:31","slug":"objective-c-programming-cheat-sheet","status":"publish","type":"post","link":"https:\/\/www.freelancinggig.com\/blog\/2017\/11\/22\/objective-c-programming-cheat-sheet\/","title":{"rendered":"Objective-C Programming Cheat Sheet"},"content":{"rendered":"<p>Objective-C is an object-oriented general-purpose programming language which provides extra style messaging to the C programming language. The Objective-C programming is mainly for the iOS operating system and <a class=\"glossaryLink\"  href=\"https:\/\/www.freelancinggig.com\/blog\/glossary\/api\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>API<\/a> of iOS such as Cocoa and Cocoa touches. This programming language is a superset of C, and it calls the code of C++ programming language. This cheat sheet will help you through simple and practical approach while learning Objective-C programming language. Whichever service is in high demand, you can get <a href=\"https:\/\/www.freelancinggig.com\/\">freelance services<\/a> for the same.<\/p>\n<p><strong>&#xA0;Basic Syntax of Objective-C<\/strong><\/p>\n<p>An Objective-C program consists of a single token and various tokens. The token may be symbols, identifier, and keywords. Following are the basic syntax of the objective- C programming language.<\/p>\n<p>NSLog(@&#x201D;Hello, World! \\n&#x201D;);<\/p>\n<p><strong>Data Types in Objective-C<\/strong><\/p>\n<p>The data type is used to an extensive system which is useful for declaring variables, and function of the programming language.&#xA0; The type of the variable decides how much space you require for the storage. Following are the types of Objective-C.<\/p>\n<ul>\n<li>Basic Types: There are two basic types 1) integer types 2) floating point types.<\/li>\n<li>Enumerated Types: They are used to define variables that can only assign definite discrete integer values throughout the program.<\/li>\n<li>Void Type: This data type shows the no value is available.<\/li>\n<li>Derived Types: The derived types have five categories 1) <a class=\"glossaryLink\"  href=\"https:\/\/www.freelancinggig.com\/blog\/glossary\/array\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>Array<\/a> types 2) Structure Types 3) Function Types 4) Union Type<\/li>\n<\/ul>\n<p><strong>Variable in Objective-C<\/strong><\/p>\n<p>Variables in Objective-C have a specific type which finds the size and layout of the variables memory. The variables start with a letter or an underscore. Objective-C is the <a class=\"glossaryLink\"  href=\"https:\/\/www.freelancinggig.com\/blog\/glossary\/case\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>case<\/a> sensitive, so the upper and lower case letter is different.&nbsp; Following are the types of the variables in Objective-C<\/p>\n<ul>\n<li>char<\/li>\n<li>int<\/li>\n<li>float<\/li>\n<li>double<\/li>\n<li>void<\/li>\n<\/ul>\n<p><strong>Operators in Objective-C<\/strong><\/p>\n<p>Operators are the important component of the programming language because these operators tell the compiler to perform particular mathematical and logical manipulation. Following are the types of the Operators.<\/p>\n<ul>\n<li>Arithmetic Operators<\/li>\n<li>Logical Operators<\/li>\n<li>Bitwise Operators<\/li>\n<li>Relational Operators<\/li>\n<li>Assignment Operators<\/li>\n<li>Misc Operators<\/li>\n<\/ul>\n<p><strong>Array in Objective-C<\/strong><\/p>\n<p>In an Objective-C array is the collection of similar type of data types which can store sequentially in a fixed size.<\/p>\n<p>Syntax for declaration of array<\/p>\n<p>type arrayName [ arraySize ];<\/p>\n<p>Initialization of array:<\/p>\n<p>char name [10];<\/p>\n<p><strong>Pointers in Objective-C<\/strong><\/p>\n<p>A pointer is a variable which stores the <a class=\"glossaryLink\"  href=\"https:\/\/www.freelancinggig.com\/blog\/glossary\/address\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>address<\/a> of another variable. In Objective-C pointer is declared using a symbol (*).<\/p>\n<p>Syntax of Pointers<\/p>\n<p>type *var-name;<\/p>\n<p><strong>String in Objective-C<\/strong><\/p>\n<p>The concept of the string in an Objective-C programming language is using NSString, and its subclass NSMutableString provides different ways for creating string objects.<\/p>\n<p>Syntax for string<\/p>\n<p>NSString *Name = @&#x201D;Kitty&#x201D;;<\/p>\n<p><strong>Function in Objective-C<\/strong><\/p>\n<p>The function is the <a class=\"glossaryLink\"  href=\"https:\/\/www.freelancinggig.com\/blog\/glossary\/block\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>block<\/a> of statements that combines to perform the task. Every Objective-C program has C function that is main() function. The declaration includes the terms of a function name, return type, and parameters. Whichever service is in high demand, you can get freelance services for the same. Following are the syntax of the function<\/p>\n<p>(return_type) method_name:( argumentType1 )argumentName1<\/p>\n<p>joiningArgument2:( argumentType2 )argumentName2 &#x2026;<\/p>\n<p>joiningArgumentn:( argumentTypen )argumentNamen<\/p>\n<p>{<\/p>\n<p>the body of the function<\/p>\n<p>}<\/p>\n<p>typedef in Objective-C<\/p>\n<p>The keyword typedef in Objective-C is used to give a new name. Following is the syntax for typedef keyword.<\/p>\n<p>typedef unsigned char <a class=\"glossaryLink\"  href=\"https:\/\/www.freelancinggig.com\/blog\/glossary\/byte\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>BYTE<\/a><\/p>\n<p><strong>Type Casting<\/strong><\/p>\n<p>Type Casting is the technique which converts a variable from one data type to another data type. For ex, if you want to store a double value into float then that time Type Cast performs an important role.<\/p>\n<p>Syntax for type casting<\/p>\n<p>(type_name) expression<\/p>\n<p><strong>Inheritance in Objective-C<\/strong><\/p>\n<p>Inheritance is one of the important concepts of object-oriented programming language. Using the inheritance concept, you can derive a new class from the existing class. It allows the developer to reuse the code functionality and fasten the implementation time.<\/p>\n<p>Syntax<\/p>\n<p>@interface derived-class: base-class<\/p>\n<p><strong>Polymorphism in Objective-C<\/strong><\/p>\n<p>The term polymorphism is applied when there is a hierarchy of classes, and there is inheritance. In Objective-C, the polymorphism concept calls the member function, and another function gets executed according to the type of objects that invokes the function.<\/p>\n<p><strong>Data Encapsulation in Objective-C<\/strong><\/p>\n<p>Encapsulation is one of the important Object-Oriented Programming concepts that bind together the data and functions. The data encapsulation also leads to the important OOP concept that is data hiding. The Objective-C supports the properties of data hiding and encapsulation through the creation of user-defined types such as classes. The private method in the encapsulation is writing with the help of an extension.<\/p>\n<p>@interface Adder : NSObject<\/p>\n<p>{<\/p>\n<p>NSInteger total;<\/p>\n<p>}<\/p>\n<p>&#x2013; (id)initWithInitialNumber:(NSInteger)initialNumber;<\/p>\n<p>&#x2013; (void)addNumber:(NSInteger)newNumber;<\/p>\n<p>&#x2013; (NSInteger)getTotal;<\/p>\n<p>@end<strong>&#xA0;<\/strong><\/p>\n<p><strong>Summary:<\/strong><\/p>\n<p>It is the article on Objective-C programming cheat sheet. This cheat sheet will help you to understand basic and advance the concept of Objective-C programming language.<\/p>\n<p><strong>Meta Description:<\/strong><\/p>\n<p>This article is about objective c programming cheat sheet. Whichever service is in high demand, you can get <strong>freelance services<\/strong> for the same.<\/p>\n<p>&#xA0;<\/p>\n<p>&#xA0;<\/p>\n<p><strong>&#xA0;<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Objective-C is an object-oriented general-purpose programming language which provides extra style messaging to the C programming language. The Objective-C programming is mainly for the iOS &#x2026;<\/p>\n","protected":false},"author":3,"featured_media":3477,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[149],"tags":[1008,1007],"class_list":["post-3476","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-startup-resources","tag-objective-c-programming","tag-objective-c-programming-cheat-sheet"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Objective-C Programming Cheat Sheet - FreelancingGig Blog - Freelancer Job Tips and Hiring Insights<\/title>\n<meta name=\"description\" content=\"This article is about objective c programming cheat sheet. 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