protocol oriented programming swift

easier, more flexible and more fun. The interface is based on the cocoa and cocoa touch framework, which is popular with the people. Shows the new direction of software development.Swift has existed for many years. Apple is based on an existing compiler, debugger, and framework as its infrastructure. Through Arc (Automatic Reference counting. Self-referencing counts) to simplify memory management.Our framework stack is always based on cocoa. Objective-c Evolution supports blocks, collection lit

(WWDC), Apple released a new programming language, Swift, which shocked many developers. 7 years later, Apple has finally released a new language to replace Objective-c. As you will see in this book, Swift is a modern, easy-to-read programming language and has strict control over type safety. This book is intended for

http://blog.csdn.net/goohong/article/details/31769677In the swift language, types that have class characteristics are three, that is, enum types, struct types (including primitive types, the basic types are actually exceptions to struct types), and classes. Where the enumeration type, struct type is a value type, and the class belongs to the reference type. There are three types that can add attributes, methods, subscript methods, extend functionality

has only one message argument, and the parameter can also be omitted, assertionfailure () has no condition. As shown below: 3. Prerequisites (Preconditions) Preconditions's usage and assertions are the same, but there is a major need to preconditions in debug and release mode, unless compiled using –ounchecked. The screenshot below is a hint of the preconditions function given by the code hint, as follows: For specific uses of preconditions, refer to assertions, as assertions use, and do

count). Our framework stack is always based on cocoa. Objective-c Evolution supports blocks, collection literal, and modules, allowing the framework of modern languages to be used without deep access. Thanks to these basic work, the new programming language can be introduced in Apple software development (by Gashero).OBJECTIVE-C developers will feel Swift's déjà vu. Swift uses objective-c named parameters

in Apple software development (by Gashero).OBJECTIVE-C developers will feel Swift's déjà vu. Swift uses objective-c named parameters and a dynamic object model. Provides interoperability with the cocoa framework and the mix-and-match. Based on these fundamentals, Swift introduces a number of new features and a combination of process-oriented and object-

stack is always based on cocoa. Objective-c Evolution supports blocks, collection literal, and modules, allowing the framework of modern languages to be used without deep access. Thanks to these basic work, the new programming language can be introduced in Apple software development (by Gashero).OBJECTIVE-C developers will feel Swift's déjà vu. Swift uses objective-c named parameters and a dynamic object m

judgment, you should exit the judging condition as soon as possible, such asand should not5.3. Avoid strong unpacking of optional types 5.4. When you specify a type, the colon and the identifier are joined togetherWhen specifying the type of the identifier, the colon is followed by the identifier, and then the empty one is written in the type5.5. Write when neededselfJust write it when you need it.self,当调用 self 的 properties 或 methods 时，self 用默认的隐式引用：When necessary self , add, for example, in cl

in Apple software development (by Gashero).OBJECTIVE-C developers will feel Swift's déjà vu. Swift uses objective-c named parameters and a dynamic object model. Provides interoperability with the cocoa framework and the mix-and-match. Based on these fundamentals, Swift introduces a number of new features and a combination of process-oriented and object-

in Apple software development (by Gashero).OBJECTIVE-C developers will feel Swift's déjà vu. Swift uses objective-c named parameters and a dynamic object model. Provides interoperability with the cocoa framework and the mix-and-match. Based on these fundamentals, Swift introduces a number of new features and a combination of process-oriented and object-

software Development.For objective-c developers, Swift looks familiar, with the readability of objective-c named parameters and the power of the dynamic object Model. Provides seamless access to existing cocoa frameworks and the ability to integrate with OBJECTIVE-C. Built on this common Denominator. Swift introduces a number of new features, a unified program, and an object-

object's time. Google's Protocol buffers real open source time is not long, but its performance, in a short period of time caused widespread concern, its advantage is excellent performance, support Cross-platform, but use its programming code intrusive, need to write proto files, Objects that cannot be directly used in object-oriented

?? Object-oriented programming and functional programming are the two most mainstream programming paradigms, and the discussion about the merits and demerits of these two paradigms has never stopped. In fact, programmers who really understand the two programming paradigms do

Before I begin, I'd like to describe what this so-called communication program is all about. The communication program is similar to a weak version of QQ, login needs to register, after successful login, you can achieve instant communication, group chat, private chat, but also can be transmitted documents. Let's get to the last picture Server side: Client Login: Client main interface: The so-called real-time communication program, that is, the use of TCP and UDP transmission

inheritance can lead to flooding. (54) When creating an inheritance hierarchy, try creating a reusable framework, rather than a reusable component. (55) If you use multiple inheritance in your design, let's say you made a mistake. If you don't make a mistake, you need to try to prove it. (56) If you use inheritance in object-oriented design, ask yourself two questions: (1) is the derived class A special type of the thing it inherits from? (2) is the

] (parameter: parametertype)-> returntype in}When the closure and the occupied instance are always referenced and destroyed at the same time, the closure possession is defined as unowned. On the contrary, when possession references may sometimes say nil, define the possession in the closure as weak. Weak references are always optional.When both attribute values are optional and both types may be nil, use weak references.Only one of the two attributes is of the optional type, and nil may be used

Backwards (s1:string, s2:string), {return s1>s2}Passed as a function parameterSort (numbers,backwars)Closure expression pass-throughSort (numbers,{(S1:string, s2:string), BOOL inReturn S1>S2})Writing a line for short closuresSort (numbers,{(s1:string, s2:string), bool in return S1>S2})Closure can automatically infer parameter typesSort (numbers,{s1, S2 in return s1>s2})Single-line expression can omit the return keywordSort (numbers,{s1,s2 in S1>s2})Abbreviation of parameter nameSort (numbers,$0

the request (3) Close the communication channel and terminate after the request is completed 5. Type of socket socket (1) streaming socket (SOCK_STREAM) Provide connection-oriented, reliable data transfer service, no error, no duplication, and receive in Send Order (TCP protocol) (2) Datagram Socket (SOCK_DGRAM) Provides connectionless services, packets are sent in separate packages, no flawless warrantie

First, we need to know a few things about TCP:1.TCP Features: Connection-oriented reliability transmissionThe 2.TCP three-time handshake establishes the connection and four waves to release the connection, but why does TCP need three handshake to establish the connection?A: Because the two handshake cannot guarantee the reliability, if the last failure, then the client will re-initiate the connection request, then must consume the resources, and three

, changes in user requirements have become an important issue. Multiple reports on software implementation show that prior to the release and use of software products, you need to carefully evaluate the quality. The following quality factors should be taken into account in general status evaluation: 1. Correctness) 2. Maintainability) 3. Reusability) 4. Openness and Interpretability) 5. Portability) 6. Security) 7. Integrity) 8. User friendliness) Software Evolution)Ernest Tello, a famous autho