Beginner Swift Notes Enumeration (vii)

1 Import Foundation2 3 /*4 Enumeration5 6 Grammatical Structure7 enum type {8 Case Value9 }Ten */ One //define an enumeration notation 1 A enumLiushiqun { -      CaseName -      Case Age the      CaseSex -      CaseADD -      CaseSub -      CaseMul +      CaseDiv - } + //define an enumeration notation 2 A enumliushiqun_1 { at      Caseadd,sub -      CaseMul -      CaseDiv - } - //define an enumeration variable notation 1 -Let Enum_name:liushiqun = . Name in //define an enumeration variable notation 2 -Let Enum_age:liushiqun =Liushiqun.age to //defining enumeration variables notation 3 +Let Enum_add =Liushiqun_1.add -  the //combine the various ways of closures into methods with switch * //when matching, if the enumeration does not have a case for all values, switch will error or add the default at the end $Func Choosemethod (op:liushiqun_1), (double,double)Double {Panax Notoginseng     SwitchOP { -      Case . ADD: theFunc Add (a:double,b:double),Double { +                 returnA +b A         } the             returnAdd +      Case . Sub: -             return{(a:double,b:double)-Doubleinch returnAB} $      Case . Mul: $             return{return$0* $1} -      Case . Div: -             return{$0/ $1} the     default : -         return{$0+ $1}Wuyi     } the } - //declares an object that invokes a method that passes an enumeration value that is worth to a closure type WuLet Val_1 =Choosemethod (. Mul) - //calling Val_1 closures AboutLet value_2 = Val_1 (4,7) $ println (value_2) -  - /* - enumerating the original value definitions A enum Lsq:int { + Case Add,sub,mul,div the } - If you do not specify a value, start at 0, and then click +1 $ Lsq.Add.toRaw () gets the original value of the Lsq.add-corresponding Fromraw pushes the value back to the enumeration value the Lsq.Add.rawValue Get the original value of Lsq.add the  the  the enum Lsq_1:int { - Case add=0,sub=1,mul=3,div=4 in } the  the enum Lsq_2:string { About Case add= "Add", sub= "Sub", mul= "Mul", div= "Div " the } the */ the  + enumLsq_1:int { -      CaseAdd=0, Sub,mul,div the }Bayi println (Lsq_1.Add.rawValue) the enumlsq_2:string { the      CaseAdd="Add", sub="Sub", mul="Mul", div="Div" - } - println (Lsq_2.Add.rawValue) the  theLet op:lsq_2? = Lsq_2 (rawValue:"Add") the println (OP) the //string Goto enumeration value - func get_enums (str:string) { theLet new_op:lsq_2? =lsq_2 (RAWVALUE:STR) the     if varTemp_op =New_op { the         SwitchTemp_op {94          Case . ADD: theprintln"ADD") the          Case . Div: theprintln"Div")98          Case . Mul: Aboutprintln"Mul") -          Case . Sub:101println"Sub")102         default :103println"error: \ (str)")104         } the     }106     Else {107println"No")108     }109 } theGet_enums ("adds")111  the //Enumerate related values113 //Two Value Association enumeration value the enumLinesegmentdescriptor { the      CaseStartandendpattern (start:double,end:double) the      CaseStartandlengpattern (start:double,length:double)117 }118 //defines two associated values for a variable that specifies an enumeration value119 varLSD = Linesegmentdescriptor.startandendpattern (start:1, End:Ten) -LSD = Linesegmentdescriptor.startandlengpattern (start:1, Length:9)121 //Extract the Values122 SwitchLSD {123 //Case let . Startandendpattern (S, e)://switch Value binding mode124  Case. Startandendpattern (Let S,let e)://switch Value binding mode theprintln"start \ (s) end \ (e)")126  Case. Startandlengpattern (Let S,let e)://switch Value binding mode127println"start \ (s) end \ (e)") -}

Beginner Swift Notes Enumeration (vii)