Apple programming language Swift language Introduction _swift

Swift is a new programming language for writing IOS and OS X applications. Swift combines the advantages of C and objective-c and is not limited by C compatibility. Swift uses secure programming patterns and adds a lot of new features, which makes programming simpler, more scalable, and more fun. Swift supports the COCOA and Cocoa touch framework.

Swift's development began a long time ago. To lay the groundwork for swift, Apple has improved compilers, debuggers, and framework structures, allowing Swift to simplify memory management with automatic reference counting (Automatic Reference counting, ARC).

OBJECTIVE-C developers will not be unfamiliar with Swift. It takes the objective-c named parameters and the dynamic object model to seamlessly connect to the existing Cocoa framework and can be compatible with OBJECTIVE-C code. On this basis, Swift has many new features that support process-oriented programming and object-oriented programming.

Swift is simple for beginners. Swift is a programming language that meets both industrial standards and scripting languages as expressive and fun. Swift supports code previews, a revolutionary feature that allows programmers to run Swift code and view results in real time without compiling and running the application.

Swift combines the essence of modern programming language with the wisdom of Apple engineer culture. The compiler optimizes performance, the programming language optimizes development, the two do not interfere with each other, the fish and bear the cake. Swift can be used to develop small programs such as "Hello, World", or to develop a complete operating system. All of these features make Swift a worthwhile investment for both developers and Apple.

Using Swift to write IOS and OS X apps will be a wonderful experience, and Swift will continue to develop new features and compatibility.

Swift provides all the underlying data types for C and objective-c, including integer int, floating-point number double, float, boolean bool, and string strings. At the same time, Swift offers two powerful collection data types, including array (array) and dictionary (dictionary).

Like C, Swift uses variables to store and access values. Swift also supports variables that cannot be changed by values, which we call constants in C, but constants in Swift are more powerful. Constants can be used when the value of a variable does not need to be changed, which makes the code more secure and concise.

In addition, Swift introduces some advanced data types that are not available in objective-c, such as tuples (tuples), that allow you to create and pass a set of values.

Swift also introduced an option type (optionals) to handle situations where the value of a variable does not exist. There are two types of options: one is that the variable exists, for example, Equals x, and the value of the variable does not exist at all. Optionals is similar to a pointer to a nil in objective-c, but applies to all data types, not just to classes, optionals more secure and concise than objective-c pointers in nil. And is at the heart of Swift's many of the most powerful features.

Swift is a type-safe language, and Optionals is the representative. Swift can help you work in a type-safe environment, and if you need to use string type in your code, Swift's security will prevent you from incorrectly passing int, which allows you to discover and fix problems in a timely fashion during the development phase.