learning swift pdf

The Willset and Didset features are used in the swift language to monitor property value changes other than initialization of propertiesThere's no need to say too much, just look at the code below and you'll get it quickly.Copy CodeImport FoundationClass People:nsobject{Normal propertiesvar firstname:string = ""var lastname:string = ""var nickname:string = ""//计算属性var fullName:String{ get { return nickName + " " + firstName + " " + lastNa

Position 0 1 2 3 4 For scalar in Dogstring.unicodescalars { print ("\ (Scalar.value)", Terminator: "")}print ("")//68 111 103 8252 128054The first three UnicodeScalar values ( 68 , 111 , 103 ) of the value properties still represent the characters D , o and the g . The fourth codeUnit value ( 8252 ) is still a 203C decimal value equal to hexadecimal. This represents the DOUBLE EXCLAMATION MARK Unicode scalar of the character U+203C .The fift

toggle statement, which provides a multi-branch program structure.The example code for the basic form of the switch statement is as follows:Let Testscore = 86var grade:characterSwitch TESTSCORE/10 {Case 9:Grade = "excellent"Case 8:Grade = "Liang"Case 7, 6:Grade = "Medium"DefaultGrade = "Poor"}Print ("Grade = \ (Grade)")The output results are as follows:Grade = BenignGuard StatementThe Guard statement is a newly added keyword for Swift 2.0, which is v

The following is the directory where the iOS folder includes most of the iOS controls introduced and demonstrated, Swift's full version, can be completed after Swift (this look is swift just out of a week's video, may be a bit rushed, but complete), C and OC language can also complete the knowledge required to finish learning, The contents of the other folders ar

advantages of decorating mode: You can remove the decorations in the class from the class to simplify the original class Effectively distinguishes between core duties and decorative functions, and eliminates repetitive decorative logic in related classes Disadvantages of decorating mode: Although the decorative mode is more scalable, the number of classes is a little, how to choose the scalability and simplicity is a problem, there is a choice to sacrifice It's ha

adding the name of the parent class after their class name, separated by colons, and creating classes without a standard class, so you can ignore the parent classSubclass if you need to override the method of the parent class, you need to use the override tag--if you do not add override to override the parent class, the method Editor will error, and the editor will also detect if the override tag's method is actually in the parent classClass square:namedshape{var sidelength:doubleInit (sideleng

struct is assigned or passed, the encapsulated data will be copied instead of referenced. Regardless of what value type attributes are stored in the struct, they will be copied, not referenced. Structs do not have to inherit a property or behavior that has an existing type. Suitable structural candidates include: The size of the geometric shape. Encapsulates a width property and a height property, both of which are Double types. A path within a range that encapsulates

1. Swift does not need to write a break, so this cross-fallthrough is not happening. 2,//cannot use variable name, can replace with "_"For _ in 1...power{ answer *= base}3. Case can match many other types of patterns. Includes interval matching (range matching), tuple (tuple), and descriptive narrative of a particular type.can use caseCase 1...3:naturalcount = "a few"4. If there are multiple matches, then only the first case branch that is matched

used as a conditional judgment. var temp = 2 // compiler automatically infers type mode sound Variable TEMP = 1.0 //Compile error (4) var temp:double = 2 // Displays the specified type way declaring variables and assigning var test //Compilation error (3) var test:string // display the specified type way declare variable println (test) nbsp ; NBSp;//Compilation error (6) test = nil nbsp //compilation error (7) var te

The top of a variable, if not initialized, is not practical, Swift will error.Visual objects must also be new before they can be used.This is another way I agree with Apple.Swift is really good!If the variable is declared as an optional value, the variable defaults to a nil value (both null and void)Syntax isvar i:int?;(Spit trough The following blog park: Incredibly can not blog page directly edit blog post, must enter the background management can b

explicitdouble:double = 70 (not enough information included)3, type conversionValues are never implicitly converted to other types, and if you need to convert a value to another type, display the conversion.Let label = "the width is"Let width = 94Let Widthlabel = label + String (width)There is a simpler way to convert a value to a string: write the value in parentheses and write a backslash in parentheses.(This method class is a placeholder for more than 10 C languages)Let apples = 3Let oranges

the same name Func AddStudent3 (#name: String, age:int =) {println ("name: \ (name) , Age: ' (age) ')}addstudent3 (name: "Smith") AddStudent3 (name: "Hello", age:10)//Add an underscore before the default parameter name, the system ignores the external parameter name func AddStudent4 (name:string, _ Age:int =) {println ("name: \ (name), Age: \ (age)")}addstudent4 ("A", 2)//The parameter of the function is a constant by default, if you want to Modify the value of the parameter inside the

,value) in enumerate (shoppinglist) { println ("index is \ (index): value \ (value)")}//1.53 uses the construction syntax to create an empty array that consists of a specific data type var someint=[int] () someint+=[1,2,3] Someint=[]//into an empty shaped array//1.54 Swift in the array classType also provides a constructor that can create a specific size and that all data is default. var threedoubles=[double] (Count:3, repeatedvalue:0.0) var anotherth

Like Object-c, Swift uses its own active reference count to track and manage the memory used by the app. When the instance is no longer being used, and retaincount=0, it will voluntarily release the memory space occupied by the rationale.Note: Reference counts apply only to instances of classes, and because structs and enumeration are value types, they do not involve references, so they are stored and managed in a way that is not a reference count.Whe

Recently the spirit is poor, sleep very late, Kangren said to do fitness card fitness, remember last August to run a fitness card, I only went a few times, of course, is due to a variety of reasons I do not have time, then very hard, now in the company became stable, not like just start into the company every day to go back to knock code. Today saw a treadmill 3777, feel good, want to buy down occasionally running. OK, think about it, start learning

Swift has been out for a long time, has not started the study, now began to decide the system of learning.The beginning of learning in any language is grammar: 1. Note: Let is modified to be immutable var is variable let maximumnumberofloginattempts = 10; var currentloginattempts = 0; currentloginattempts = currentloginattempts + 1; NSLog ("maximumnumberofloginattempts =%ld", maximumnum

No matter what to do, as long as the dedication point, to do a good job. Don't always find excuses. Don't look down on small things, life is a collection of small things. Details determine success or failure. Soldier assault inside there is a line: every time he did a little thing, it seems to have caught a straw, to the end you found that he was holding a towering tree.Vii. Object-orientedSwift can defineObject-oriented type: enumeration struct class , can define variables, enumerations, struct

function: a sentenceFunctions with multiple return values: The following example defines a named Count function, which calculates vowels, consonants, and other characters in a string, based on the standard setting of vowels and consonants used in American English.Functions with multiple return values, tuple type as function return type Func count (string:string)--(Vowels:int,consonants:int) {var vowels = 0,consonants = 0 For character in string{ switch string (character). lowercasestr

two objects refer to the same object instance. When the context needs to create a shared, mutable object. In Swift,, Array , String Dictionary are value types. They are used in the same way as in C int , where each instance has a piece of data. You do not need to perform a copy of the display to prevent the data from being modified without your knowledge. What's more, you can pass arguments across threads without having to worry about synchr

A large number of linux-PDF document learning resources and video tutorials | download ephemeral disks! -- Linux general technology-Linux technology and application information. For details, refer to the following section. Linux-w.gov.rar large's linux private dish [open password linuxeden] \ Red Hat \ ubuntu \ Hongqi \ microsoft MCSE And so on. Http://www.namipan.com/d/a41268cb6d8d61e3a5a4ccf9539cdf0179b