protocol oriented programming swift

have to decide your parent in the first, not the late. If the parent class has a variable that stores the type, you have no choice but to accept them all. And to initialize them, be careful not to break the constants of the parent class. You need to choose whether and how to overload the parent-class method in a workable way. 3. The abstraction of a class causes the loss of relational information between types (Lost type relationship) When you don't understand any of the information, you must a

In Swift, the protocol can not only define methods and properties, but also the protocol can be extended, the most important is that in the extension of the protocol can be added to some of the default implementation of the method, that is, in the method of the protocol can

instead} definition of instance method in Protocol Protocol RandomNumberGenerator {Func random ()-> Double}The RandomNumberGenerator protocol does not care how the return value is generated, it only emphasizes the creation of a double type value After introducing the definition of the methods and attributes of the

: Note The Serialversionuid inconsistency throws a serialized run-time exception.11. The "forced" construction method prohibits any business logic from being added, and if there is initialization logic, put it in the Init method.12. The "force" Pojo class must write the ToString method. When using the IDE's tools:source> generate ToString, if you inherit another Pojo class, be careful to add super.tostring to the front. Description: When the method execution throws an exception, you can directly

A protocol defines a blueprint for the methods, attributes, and other requirements that are needed for a particular task or function. The protocol itself does not provide an implementation of these requirements, it simply describes a blueprint for the implementation of a task or function. A protocol is similar to an interface definition in the Java language, w

The most important concept in network programming is the connection orientation (connection-oriented) and the non-connected (connectionless) protocol. Though the essence. The difference between the two is not difficult to understand, programming people, but it is a very easy to confuse the problem.The problem is somewh

With open (' path ', ' R ', encoding= ' utf-8 ') as F:code blockThis is called the on-line management protocol, the WITH statement, in order for an object to be compatible with the WITH statement, the __enter__ and __exit__ methods must be declared in the class of the object.Context Management Protocol:Class Open:def __init__ (self,name):Self.name=namedef __enter__ (self):Print (' A With statement appears, the object's __enter__ is triggered, the retu

Swift object-oriented explanation, swift object-oriented 1. First, let's take a look at how to define attributes, constructors, methods, and class methods in a Class and Class in Swift. Import Foundationclass Hello {// member attribute var _ name: NSString? = "Jikexueyuan" /

myrect{ func mylucknumber () int}class myrectimp:myrect{ func mylucknumber () Int { Retu RN Ten }}class Dice {let sides:int var gener:myrect //as type init (sides:int, gener:myrect) { / /as parameter self.sides = sides Self.gener = gener }}var dice = Dice (sides:6, Gener:myrectimp ()) Dice.gener.myLuckNumber () //Return 10See Example code: http://github.com/xn4545945/SwiftLearningReference:The Swift

these basic work, we can now release such a new language for future Apple software development. Swift feels familiar to Objective-C developers. it adopts the readability of Objective-C's named parameters and the power of Objective-C's dynamic object model. it provides seamless access to existing Cocoa frameworks and mixand-match interoperability with Objective-C code. building from this common ground, Swift