swift programming book

Swift Programming Language -- Optional chain (Optional Chaining), swiftoptional Optional Chaining is a process that allows you to request and call attributes, methods, and subscripts, its self-sufficiency is reflected in that the current request or call target may be null (nil ). If the self-determined target has a value, the call will succeed. On the contrary, if the selected target is null (nil), the call

First create a single view project for SwiftThen create the OC file directly in the project:Then select the OC language and ask if you want to automatically create intermediate files for OC and Swift:Then there are three files in the project folder:Now an example is written in the OC header file and the implementation file:Then in the swift language and the Obje...ridging-header.h fileYou can then use it directly in the

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, which describes what an implementation can do, but does not itself contain any implementations. Unlike interfaces, the

The swift Programming Language Reading Notes on the seventh page contains two main content: print the output and how to comment out code 1 in swift how to print the value of variables and constants? Use the println function. For details, the println function outputs a line feed in addition to the variable constant value. 1) print the constant eg1 let hW = "Hello

Writing to the freshman who just learned C language -- There are a wide array of reference books. How can I choose one? The reason why many people learn C language is still not programming. First, there is a lack of sense of crisis and very little computer programming. Second, even if I read a lot of reference books, I will talk about them in general. In the end, as long as the

Long time no log, strange is very special more near, recently participated in the programming aspect is CSDN in the College club's online programming plug. Speaking of the programming contest. A total of three questions. The title is able to CSDN college to see the club. When the game was a little tense, the third question involved a queue, a hint, a pit ... Also

I have read the first chapter of "Boulevard to Jane", and now write my book.First, the opening is introduced by the "Yugong Yishan", describing the origin of the original needs, the basic way of project communication, and determine the project objectives, in order to achieve this goal has chosen an orderly, achievable technical solutions. In the implementation of the project in the appearance of the people according to the different tasks divided for technical personnel, engineering managers and

If there are many things at work, and you want to squeeze some time to read and study after going home. Choosing an entry-level book is critical. The book Dom Script Programming is very good and well translated. The audience reading this book are not beginners of JavaScript that are affected by the browser melee at the

I would like to recommend a book on PHP programming ideas! ? I want to learn PHP well. I made an excellent book on "php and mysqlweb Development (formerly known as version 4th)", but I always felt that I did not have any so-called programming ideas, I would like to introduce a book