Contents
What are the types of delegate?
Types of Delegation of Authority
- General or Specific Delegation. It is based on the job assigned.
- Formal or Informal Delegation. It is based on the process of giving authority.
- Top to bottom or bottom to top Delegation. It is based on the hierarchy.
- Lateral Delegation. It requires a group or team to work in parallel.
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.
How many methods can be called using a delegate?
There are three steps in using delegates. These include declaration, instantiation, and invocation. The following statement shows how you can declare a delegate.
How do I invoke a delegate?
Delegates can be invoke like a normal function or Invoke() method. Multiple methods can be assigned to the delegate using “+” or “+=” operator and removed using “-” or “-=” operator. It is called multicast delegate. If a multicast delegate returns a value then it returns the value from the last assigned target method.
What is the difference between method and delegate?
A delegate is declared outside a class whereas, an event is declared inside a class. To invoke a method using a delegate object, the method has to be referred to the delegate object. On the other hand, to invoke a method using an event object the method has to be referred to the event object.
What is the advantage of using delegate?
Delegation provides advantages for you, your team or department and the organisation. These include: The organisation increases and improves its reputation as an employer of choice . When employees are given opportunities to develop and challenge themselves, their loyalty and productivity improve or, at least, they do not decrease.
What is difference between delegate and interface?
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What to do with delegate?
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. Methods do not have to match the delegate type exactly. For more information, see Using Variance in Delegates.