What is a protocol in Objective-C?
In Objective-C, a protocol is a group of methods that can be implemented by any class. Protocols are essentially the same as interfaces in C#, and they both have similar goals.
What is protocol and delegates?
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.
How do I add a protocol in Objective-C?
In Objective-C, you add the protocol name in angle brackets beside the class interface declaration. MyClass is declaring that it conforms to SampleProtocol below. MyClass will also have to provide an implementation for “someMethod” in the implementation file because it is a required protocol method.
What is protocol and delegate in Swift?
How will you explain the difference between delegate and protocol in Swift? Protocol: A set of methods that would be implemented by the class which conforms to that protocol. Delegate: The reference to that class which conforms to the protocol and will adhere to implement methods defined in the protocol.
What is delegate in Objective-C?
An Objective-C delegate is an object that has been assigned to the delegate property another object. To create one, you define a class that implements the delegate methods you’re interested in, and mark that class as implementing the delegate protocol.
What is Delegation in C?
Advertisements. C# delegates are similar to pointers to functions, in C or C++. A delegate is a reference type variable that holds the reference to a method. The reference can be changed at runtime. Delegates are especially used for implementing events and the call-back methods.
What are protocols in Swift?
In Swift, a protocol defines a blueprint of methods or properties that can then be adopted by classes (or any other types). We use the protocol keyword to define a protocol. For example, protocol Greet { // blueprint of a property var name: String { get } // blueprint of a method func message() }
What is delegates explain with example?
Delegates allow methods to be passed as parameters. Delegates can be used to define callback methods. Delegates can be chained together; for example, multiple methods can be called on a single event.
Is protocol an interface?
An interface defines how two entities may communicate. A protocol defines how they should communicate and what that communication means.
What is delegates in C?
What is a delegate method?
A delegate method is a method that the delegate object is expected to implement. Some delegate methods are required, while some are not. In IOS, most delegates are expected to conform to an Objective-C protocol; the protocol declaration will tell you which methods are optional and which are required.
What is the role of delegates?
In the United States Congress delegates are elected to represent the interests of a United States territory and its citizens or nationals. In addition, certain US states are governed by a House of Delegates or another parliamentary assembly whose members are known as elected delegates.