learning swift pdf

[Swift learning] Swift programming journey (3): swift learning programming journey 　　Tuples) 　　Tuples combines multiple single values into a composite value. It can contain any type of value, and does not need to be of the same type. 1. Create tuples 1. let http404error = (

One: Understanding Swift//1. Import the framework//#import Import UIKit//2. Define an identifier//int a = ten;//define identifiers in Swift: whether the identifier is a constant or a variable must be established//var (variable)/let (constant) identifier name: type of identifier = initialization valuevar a:int =Ten; let B:double=3.14; a= in;//B = 3.11 Error notation//3. The statement can not follow after the

[Swift learning] Swift programming tour --- ARC (20), swift --- arc Swift uses automatic reference count (ARC) to track and manage the memory used by the application. In most cases, this means that in the Swift language, memory ma

[Swift learning] Swift programming tour-character and string (5), swift tour String is the String type of swift. A string is a valid Character Sequence. Therefore, a character set can be expressed in combination. You can use the + symbol to connect to a string. String type

[Swift learning] Swift programming tour-array of Collection types (6), swift tour Swift provides three main collection types: array, set, and dictionary. This section describes array. An array is a set of the same type of storage order. The same value can appear in differe

empty set of protocols.Anyobject is a protocol, and any is a 0 protocol. Finally look at a definition of Anyclass: Typealias Anyclass = Anyobject.type It's really just an alias.Any is also an alias and an alias for protocol1 Protocol lyprotocol1{2 //some code3 }4 classlynsobject1:nsobject,lyprotocol1{5 //some code6 }7 8 var ly1:any9var ly2:protocolTen OneTypealias Any1 = protocol Avar k:protocol - var k1:nsobjectprotocol - thevar sss1:protocolNSObject () -var sss2:nsobjectpro

[Swift learning] Swift programming tour-expansion (24), swift tour An extension adds new features to an existing class, struct, or enumeration type, including attributes and Methods. If you define an extension to add new features to an existing type, this new function is available to all existing instances of this type

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[Swift] learning notes (1) -- getting started with basic data types, code styles, tuples, assertions, and swift learning notes Since Apple released swift, I have been trying to learn about it and have never been fully involved in it. From today on, I will use blogs to drive

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detailed and scientific design process, but this is a "waterfall"February 10: User experience design for the fourth phase mobile app-prototyping driverOur design process needs to be iterative, repeated testing and confirmation, as well as constant communication with product managers, programmers, marketers, and visual designers during the design process. The best way to achieve these communication and testing is to use prototypes to drive the design. Of course, the prototype is fidelity, there

a detailed and scientific design process, but this is a "waterfall"February 10: User experience design for the fourth phase mobile app-prototyping driverOur design process needs to be iterative, repeated testing and confirmation, as well as constant communication with product managers, programmers, marketers, and visual designers during the design process. The best way to achieve these communication and testing is to use prototypes to drive the design. Of course, the prototype is fidelity, ther

from NSObject or NSObject, the corresponding transformation class will not be generated after compilation.This makes the corresponding declaration not found in OC.As in my example, class Act is not compiled into Swiftmodule-swift.h, but written as Class Act:nsobject, the corresponding declaration can be compiled. It is also possible to use @objc to declare, but this is still the same, the class best inherit nsobject down.Just like the following:Import FOUNDATION@OBJC (ACT) class Act { func h

subscript may be too small or too large. -You need to input a value to the function, but the invalid value may cause the function to fail to run normally. -An optional value is now nil, but a non-nil value is required for subsequent code execution. Okay, the above is all about Swift's first chapter. The basic part is the basics. The links to all translated articles in Chapter 1 are as follows: Swift learnin