Swift's notes and tools class

Create Class (overload effect)

Create class MyClass {    //Properties member variable        init () {        ///Constructor constructor    }        //Method member methods 
   func doIt () {        println ("DoIt")    }        func doIt (), Int {        return 0    }        func doIt (a:int),  int {        return a    }        func doIt (A:int, b:int), int {        return a + b    }        func doIt (), String {        return "    }        func doIt (a:string)-String {        return a    }        func doIt (a:string, b:string ), String {        return a + b    }}//create/using an Instance Create/use an instance var a = MyClass () a.doit ("Wang", B: "Z Hipeng ")

Enums Enumeration

Enums enum enum Comcsofttype:int {case        Developmentengineer = 1 case        Testengineer = 2    }var myType = COMCSOFTT Ype. Developmentengineer

Declaring declaration of the Variables variable (optional variable)

declaring Variables variable declaration var mutabledouble:double = 1.0mutableDouble = 2.0let constantdouble:double = 1.0//constantdou ble = 2.0 error errors var autodouble = 1.0//Optional Value Optional variable (new mechanism) var optiondouble:double? At this moment optiondouble does not allocate memory at all, take address: &optiondouble is nulloptiondouble = 1.0//This time start optiondouble will start allocating memory if let Definedou ble = optiondouble {    println ("Allocated memory")}else {    println ("No Memory Allocated")}

Control Flow

Control flow controlled stream var condition = Trueif Condition {    println ("correct")}else {    println ("error")}var val = "Four" switch VA l {case    ' one ':        ' one ' case    ', ' three ': ' Three ', ' Default ':        ' default '}//omits Upper Value, use ... to include  omits the upper value, using ... Includes for I in 0..3 {    println ("i = \ (i)")}for var j = 0; j < 3; ++j {    println ("j = \ (j)")}//whilevar n = 2while n < {    n = n * 2}PRINTLN (n) var m = 2do {    m = m * 2} while M < 100println (m)

String Quick Examples Examples of strings

Examples of string Quick Examples strings var firstName = "Zhipeng" var lastName = "Wang" var hellostring = "Hello, \ (LastName) \ (first Name) "var tipstring =" 2499 "var tipint = tipstring.toint () extension Double {    init (string:string) {Self        = Double ( String.bridgetoobjectivec (). Doublevalue)    }}tipstring = "24.99" var tipdouble = Double (string:tipstring)

Array Quick Examples examples of arrays

Array Quick Examples example var person1 = "one" var Person2 = "One" var array:string[] = [Person1, Person2]array + = "three" For the in array {    println ("Person: \ (person)")}var Persontwo = Array[1]println ("Persontwo: \ (persontwo)")

Dictionary Quick Examples Dictionary example (generic effect)

Examples of Dictionary Quick Examples dictionary var dic:dictionary<string, string> = ["One": "1", "one":                                     "2",                                     "three": "3 "]dic[" three "] =" 4 "//Update threedic[" one "] = nil//Delete onefor (key, value) in dic {    println (" key: \ (key), value : \ (Value) ")}

function Functions

function Func getpirces () (double, double, double) {    return (1.1, 1.2, 1.3)//tuple}//remove tuple var (one, TW O, three) = Getpirces () println ("one = \ (one), both = \ (one), three = \ (three)") Func getsum (Numbers:int ...), Int {    var sum = 0 for number    in numbers {        sum + = number    }    return Sum}getsum () getsum (1, 3, 5, 7, 9)

function nesting

Function nesting func nestedfunction (), Int {    var x = 0    //    func Add () {        x + = 1    }    //    Add () 
   
    return x}
   

function passing

Function pass func makeincrementer ()--(int-int) {    func addone (number:int), int {        return number + 1    }< C3/>return Addone}var increment = Makeincrementer () increment (1) func makeIncrementer2 (), (String, String) String) {    func and (a:string, b:string), string {        return a + b    }    return And}var Increment2 = Makeincre Menter2 () Increment2 ("Wang", "Zhieng") func Lessthanone (number:int), Bool {    return number < 1}func MakeIncrementer3 (list:int[], condition:int-bool), BOOL {for number in    list {        if condition (number) {
   return true        }    }    return False}makeincrementer3 ([1,2,3,4,5], Lessthanone)

Extends Inheritance (polymorphic effect)

Extends Inheritance (polymorphic effect) println ("======================= Extends Inheritance") class people {//Eat eat func Eat () {println    ("Eat")} Sleep in Func sleep () {println ("Sleep")}//Work working func () {println ("work")}//said Said Func said () {println ("I am a person")}}class Chinese:people {//said said override Func said () {println ("I Am Chinese")}}    Class Americans:people {//said says override Func said () {println ("I am American")}}class Alien {//Eat Eat Func unknown () {println ("aliens")}}//does not support multiple inheritance//class Futuregenerations:chinese, Americans {//multiple Inheritanc    E from classes ' Chinese ' and ' Americans '////Said said//override Func said () {//println ("I am a descendant of Chinese and Americans")// }//}//Polymorphism Requirements: 1. Inheritance 2. Override 3. The parent class reference points to the subclass object var people = people () people.said () people = Chinese () people.said () people = Americans ( ) People.said ()//people = Alien () Error ' Alien ' is not convertible to ' people '//people.said () var Chinese = Chinese () ChiNese.said () var Americans = Americans () Americans.said () 

Swift's notes and tools class