what is the difference between category and subclass in ios?
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Categories : Categories provide the ability to add functionality to an object without subclassing or changing the actual object. ... Subclasses : Every object you create in your Cocoa application descends from the 'NSObject' foundation class. The NSObject class identifies properties and methods which apply to all objects.
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Answer and Explanation: The difference between a phylum and a class is their hierarchical level in the biological classification system. A phylum is above class, making it a...
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NSObject. The root class of most Objective-C class hierarchies, from which subclasses inherit a basic interface to the runtime system and the ability to behave as Objective-C objects.
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An open class is accessible and subclassable outside of the defining module. An open class member is accessible and overridable outside of the defining module. A public class is accessible but not subclassable outside of the defining module.
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Inheritance refers to using the structure and behavior of a super class in a subclass. Polymorphism refers to changing the behavior of a super class in the subclass. Polymorphism: The ability to treat objects of different types in a similar manner.
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A sub and a function are both subroutines, or sections of code that can be called in the program. The difference between them is that a function has a return value and a sub does not. A class is a group of codes that can include subs, functions, and other stuff.
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The difference between Category and Type. When used as nouns, category means a group, often named or numbered, to which items are assigned based on similarity or defined criteria, whereas type means a grouping based on shared characteristics.
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Before Swift 4, the compiler made some Swift declarations automatically available to Objective-C. For example, if one subclassed from NSObject, the compiler created Objective-C entry points for all methods in such classes. The mechanism is called @objc inference.
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While they are both rooted in C, they are two completely different languages. A major difference is that Objective-C is focused on runtime-decisions for dispatching and heavily depends on its runtime library to handle inheritance and polymorphism, while in C++ the focus usually lies on static, compile time, decisions.
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The main difference between categories and tags is the way you use them. In a way, categories are meant to indicate the genre of the post, so to speak. Tags, on the other hand, go much more in depth and indicate the individual things that the post talks about.
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Basically, a category is a collection of similar data sorted into the same place, and this arrangement enables the researchers to identify and describe the characteristics of the category. ... A theme, on the other hand, is a meaningful “essence” that runs through the data.
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The difference is simple and conceptual. A class is a template for objects. A class defines object properties including a valid range of values, and a default value. A class also describes object behavior.
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Difference between Structs and Classes: Structs are value type whereas Classes are reference type. Structs are stored on the stack whereas Classes are stored on the heap. ... When you copy struct into another struct, a new copy of that struct gets created modified of one struct won't affect the value of the other struct.
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NSError is a Cocoa class. An NSError object encapsulates information about an error condition in an extendable, object-oriented manner. It consists of a predefined error domain, a domain-specific error code, and a user info dictionary containing application-specific information.
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As nouns the difference between grade and class is that grade is a rating while class is (countable) a group, collection, category or set sharing characteristics or attributes.
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In summary, virtual classes permits subclassing and method overriding. However, a virtual class does implement functionality itself and can be instantiated and used directly. Conversely, abstract classes must be subclassed and have methods overridden to provide functionality.
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The most basic difference is that overloading is being done in the same class while for overriding base and child classes are required. Overriding is all about giving a specific implementation to the inherited method of parent class.