learning swift pdf

\ (a)" the//string contains a valuevarlist=["a","B","C","D"]//Array definitionlist[1] ="B1" //array can be directly assigned to a value Letemptyarray=String[]()//define an empty array Letemptydictionary=dictionaryString,list> ()//define an empty dictionaryvarCannil:String? ="ABC" //OptionalCycleforiteminlist{}遍历词典和数组for (itemin array{ forinitem{ }}Conditionsifa>10 { //苹果为什么不搞和c java 类似的语法呢}ifa=b{}Branchswitchstr{ case"a": case"b": default:}Cyclewhilei1

player has won the 2,000 coin. the player's wallet now has 2,100 coins, and the bank has only 7,900 coins left. Playerone = Nilprint ("The Bank now has \ (bank.coinsinbank) Coins")The player has now left the game. This indicates that you want to set the optional playerone variable to nil, which means "There is no player instance ." When this happens, theplayerone variable's reference to the player instance is broken. There is no other property or variable that references the player instance, so

;)But there's so much to say. The readability is completely erased ...If you need to enter a very long function body in a closure, it will be troublesome. It's inconvenient to read, so there's a trailing closure. The closure is placed on the tail of the function.The above can be written as:Reversed = sorted (names) {$ > $}6. Value CaptureClosures can capture constants or variables in the context in which they are defined. Even though the original domain that defines these constants and variables

"Similarly, you can use hasSuffix(_:) methods to calculate the number of scenes that occur in different places:var mansioncount = 0var Cellcount = 0for scene in Romeoandjuliet { if Scene.hassuffix ("Capulet ' s Mansion") { ++man Sioncount } else if Scene.hassuffix ("Friar Lawrence ' s cell") { ++cellcount }}print ("\ (Mansioncount) Mansion scenes; \ (cellcount) cell scenes ")//Print output" 6 mansion scenes; 2 cell scenes " Note: The and methods are each characte

the parent class constructor. in general, a subclass can inherit only one parent class, which is calledSingle Inheritance, but there are cases where a subclass can have multiple different parent classes, which is calledMultiple Inheritance. In theSwift, the inheritance of a class can only be single-inheritance. Multiple inheritance can be implemented by complying with multiple protocols. In other words,Swift, a class can inherit only one parent class

descript ()}class student:human{ var name:string = "abc" Func descript () { println ("abc") }}Key points:① for an optional method or property. Need to precede a method or attribute with@optionalkeyword② assumes that an optional method or attribute is included in the protocol and is required to define theProtocolbefore adding@objckeyword③ in an optional protocol, there is no type that OC does not have. For example, variable-length type④ Optional protocol can only be class-compliantIv

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 implement some logic, because of this feature, Swift can be protocol-oriented programming.Extended protocols and default implementation

variable it capturesCallLet Addbody = Makearray ("Renhairui")println (Addbody)//[Renhairui]println (addbody)//[renhairui,renhairui]Let Addother = Makearray ("Monkey King")println (Addother)//[Sun Wukong]println (Addother)//[Monkey King, Monkey King]The output is two monkey Kingclosures are reference types , so when you copy a closure to two reference variables, the program does not copy them, so they all point to the same closureLet addtest = Addotherprintln (addtest)//[Monkey King, Monkey King

10, Structure (Structure) 10.1 definition of the structure of the bodyPrinted: 1210.2 Constructors for structs　　　　Printed: 2110.3 struct is a value type　　　　Print: "Huahua", indicating that the value of MyTV has not changed, indicating that the value type10.4 Understanding the selection of structs and classes　　　　11, Protocol (PROTOTOL) 11.1 Syntax 11.1.1 property and method definition 11.1.2 when there is a parent class　　　　　　11.2 Protocol Types　　　　11.3 Protocol Inheritance　　　　11.4 Protocol Synthe

existing type by extending it to adopt one or more protocols. In this case, the protocol name is written in the same way, whether it is a class or a struct.Extension Sometype:someprotocol,anotherprotocol {The protocol implementation is written here}A detailed description of how to add protocol consistency in this way can be referenced by extending protocol consistency.Attention:If you add new features to an existing type by extension, the new feature is available for all existing instances of t

Swift and OBJECTIVE-C Interactive summaryUsing Objective-c in Swift (simple)When you create a OJBC file, Xcode prompts you to create a xxx-bridging-header.h file that creates theImport the Objective-c class that needs to be introduced into Swift on the xxx-bridging-header.h created#import " Need.h "And then you can use it in Swfit.Using

IOS: learning notes, mixed Summary of Swift and Objective-C, and iosobjective-cSummary of interaction between Swift and Objective-CUsing Objective-C in Swift (simple) When you create an OjbC file, XCode prompts you to create a XXX-Bridging-Header.h File Import the Objective-C class that needs to be introduced to

The-swift-programming-language learning notes, swiftlanguageConstants and variables Constants cannot be modified. constants defined in classes can be assigned values in constructors. Let ModifierVariables can be modified. Var ModifierTraversal of characters in a stringFor code in string {}For codeunit in string. unicodeScalars {}Control statement Break jump out of the loop bodyContinue terminates the curren

expressive, more fluent, but also maintains that the function body is readable and has a clear intentionprintln (Join (string: "Hello", toString: "World", Withjoiner: ","))*/2.2 Shorthand External parameter nameIf you need to provide an external parameter name, but the local parameter name is already defined, then you do not need to write the parameter names two times. Instead, write only the parameter name once and prefix it with the pound sign (#). This tells

(Input:int)int{returnInput-1}func Stepbackward (input:int)-Int {returnInput +1}func chosestepfunction (backwards:bool)(INT)Int {returnBackwards?Stepforward:stepbackward}var CurrentValue=3Let Movenearertozero= Chosestepfunction (Backwards:currentvalue >0) whileCurrentValue! =0{CurrentValue=Movenearertozero (currentvalue)}inline functionsAll of the functions described above are global functions that are defined in the global scope. You can also define another function inside the function, which i

class. If a specified construction method with parameters exists in the parent class, the specified construction method of the subclass does not automatically invoke the parent class with the specified construction method without a parameter. If the parent class has only one parameterless construction method (regardless of whether it contains a convenient construction method), the constructor method of the subclass automatically calls the parent class's parameterless construction method

use let. Because weak may be modified at run time. Once a weak object is disposed, it is automatically set to nil, and all cannot beDetail 2:? (optional unpacking) is usually used to send messages simply, no calculations! (forcibly unpacking) the forced unpacking must have a value that, if not, would cause a crash, typically used to calculate2.Swift Recommended methodloaddata{[Weak self] inPrint (self?. View}[Weak self] means that all self in the clo

(_ Input:int), int{return input + 1}Func Stepbackward (_ Input:int), int{Return input-1}The return type of the following function is a function of type int (int),Func choosestepfunction (Backward:bool)-(Int)-int{Return backward? Stepbackward (_:): Stepforward (_:)}You can use Choosestepfunction (backward:) To get one of two functionsvar currentvalue = 3Let Movenearertozero = choosestepfunction (Backward:currentvalue > 0)Print (Movenearertozero (currentvalue))Nested functionsAll the functions yo

A few days ago in Apple's Official document learning IOS9 3D Touch, found Apple about 3D touch Smaple code, unexpectedly is written in swift syntax, and there is no OC version.It seems that learning Swift grammar is imperative.The best way to learn the basics of Swift gramma

This book is comprehensive and detailed, not only suitable for those who do not have the technology foundation of Eclipse platform, but also suitable for the readers who know the relevant technology and have a certain plug-in development ability. "Eclipse plug-in development learning notes" PDF content free download Links:http://download.csdn.net/detail/tan3739/8771149source free download Link:http://down