Can Objective-C protocol have properties?
Protocols can include declarations for both instance methods and class methods, as well as properties. Objective-C uses angle brackets to indicate conformance to a protocol. This example declares a weak property for a generic object pointer that conforms to the XYZPieChartViewDataSource protocol.
What is a protocol in Objective-C?
Objective-C allows you to define protocols, which declare the methods expected to be used for a particular situation. Protocols are implemented in the classes conforming to the protocol. We have a delegate object that holds the reference of the calling object that implements the protocol.
What are the properties of protocol?
A protocol defines a blueprint of methods, properties, and other requirements that suit a particular task or piece of functionality. The protocol can then be adopted by a class, structure, or enumeration to provide an actual implementation of those requirements.
What is the difference between protocol in Swift and Objective-C?
In Swift, the syntax is a little different but the idea is the same. In Objective-C, you add the protocol name in angle brackets beside the class interface declaration. MyClass will also have to provide an implementation for “someMethod” in the implementation file because it is a required protocol method.
What is the difference between protocol and delegate?
Protocol is a set of methods (either optional or required) that would be implemented by the class which conforms to that protocol. While, delegate is the reference to that class which conforms to that protocol and will adhere to implement methods defined in protocol.
What is subjective property?
The subjective property of a product is the perception of that product upon the senses of the consumer. It is the smell of the fragrance. It is the way the lather feels when you are applying the shampoo to your hair and the way your hair feels after it has been cleaned.
What is protocol in C language?
Protocol is a term used by particular object-oriented programming languages with a variety of specific meanings, which other languages may term interface or trait. Protocol when used otherwise is akin to a communication protocol, indicating the chain of interactions between the caller and the object.
What is protocol and delegate in Objective-C?
What are protocols? Conceptually it serves as similar purpose as to the header file of the class you are assigning as a delegate class. A protocol is a explicit way of defining what methods needs to be implemented in the class who’s pointer was set as a delegate within a class.
Can Swift protocols have properties?
A protocol can have properties as well as methods that a class, enum or struct conforming to this protocol can implement. A protocol declaration only specifies the required property name and type. It doesn’t say anything about whether the property should be a stored one or a computed one.
What exactly is a protocol?
protocol, in computer science, a set of rules or procedures for transmitting data between electronic devices, such as computers. In order for computers to exchange information, there must be a preexisting agreement as to how the information will be structured and how each side will send and receive it.
How are protocols defined in Objective-C programming?
Objective-C Protocols. Objective-C allows you to define protocols, which declare the methods expected to be used for a particular situation. Protocols are implemented in the classes conforming to the protocol.
What is the purpose of declared properties in Objective C?
The Objective-C declared properties feature provides a simple way to declare and implement an object’s accessor methods. You typically access an object’s properties (in the sense of its attributes and relationships) through a pair of accessor (getter/setter) methods.
What does it mean when object conforms to protocol?
It doesn’t matter whether the object is an instance of UIViewController or NSObject. All that matters is that it conforms to the protocol, which means the pie chart view knows it can request the information it needs. By default, all methods declared in a protocol are required methods.
What do the methods declare in a protocol mean?
By default, all methods declared in a protocol are required methods. This means that any class that conforms to the protocol must implement those methods. It’s also possible to specify optional methods in a protocol. These are methods that a class can implement only if it needs to.