{"id":5727,"date":"2014-06-26T23:41:34","date_gmt":"2014-06-26T22:41:34","guid":{"rendered":"http:\/\/www.iprog.it\/blog\/?p=5727"},"modified":"2014-06-26T23:41:34","modified_gmt":"2014-06-26T22:41:34","slug":"swift-sintassi-base-parte-2","status":"publish","type":"post","link":"https:\/\/www.iprog.it\/blog\/swift\/swift-sintassi-base-parte-2\/","title":{"rendered":"Swift: Sintassi di base parte tre"},"content":{"rendered":"

\"swift-hero\"<\/a><\/p>\n

Ciao a tutti e bentornati in questa nuova lezione dedicata al nuovo linguaggio di casa Apple. \u00a0Swift tra le varie strutture dati mette a disposizione anche le struct, per chi non ricorda cosa sono le struct o come si usano pu\u00f2 leggersi questo\u00a0\u00a0nostro articolo:\u00a0Struct in C<\/a>.<\/p>\n

struct<\/span>\u00a0Persona {\r\nvar<\/span>\u00a0nome :<\/span>String\r\n<\/span>var<\/span>\u00a0cognome :<\/span>String\r\n<\/span>init<\/span>\u00a0(name:<\/span>String<\/span>,surname:<\/span>String<\/span>){\r\n<\/span>nome<\/span>=name\r\n<\/span>cognome<\/span>=surname\r\n<\/span>}\r\n<\/span>func<\/span>\u00a0stampaInfo(name:<\/span>String<\/span>,surname:<\/span>String<\/span>){\r\n<\/span>println<\/span>\u00a0(<\/span>\"mi chiamo\u00a0<\/span>\\(name)\\(surname)<\/span>\"<\/span>)\r\n<\/span>}\r\n<\/span>func<\/span>\u00a0stampa(){\r\n<\/span>println<\/span>\u00a0(<\/span>\"mi chiamo\u00a0<\/span>\\(<\/span>nome<\/span>)\\(<\/span>cognome<\/span>)<\/span>\"<\/span>)\r\n<\/span>}\r\n<\/span>}\r\n<\/span>var<\/span>\u00a0pippo =\u00a0<\/span>Persona<\/span>(name:\u00a0<\/span>\"Mario\"<\/span>, surname:\u00a0<\/span>\"Rossi\"<\/span>)\r\n<\/span>pippo<\/span>.<\/span>stampa<\/span>()\r\n<\/span>pippo<\/span>.<\/span>stampaInfo<\/span>(<\/span>\"Luigi\"<\/span>, surname:\u00a0<\/span>\"Bianchi\"<\/span>)<\/span><\/pre>\n
Come si pu\u00f2 notare in swift non c’\u00e8 molta differenza tra una classe e una struct, quindi la domanda che sicuramente vi state porgendo: quale sono le differenze tra le due? e quando usare una e quando usare l’altra? Be prima di tutto una struct non pu\u00f2 ereditare da un’altra struct, \u00a0quindi questa potrebbe essere una prima differenza, poi le\u00a0struct sono passate per valore mentre le classi per riferimento. Quindi per quanto mi riguarda utilizzerei una struct per una struttura dati non molto complessa, mentre una classe per un qualcosa di pi\u00f9 complesso.<\/span>\u00a0Vediamo ora come creare un metodo di classe o metodi statici:<\/p>\n
class<\/span> MiaClasse {<\/p>\n
class<\/span> func<\/span>\u00a0 mioMetodo (stringa :String<\/span>)->String<\/span>{<\/p>\n
return<\/span> stringa + ” metodo di classe”<\/span><\/p>\n
}<\/p>\n
}<\/p>\n
var<\/span> stringa = <\/span>“Mia Stringa”<\/p>\n
println <\/span>(MiaClasse<\/span>.mioMetodo( stringa<\/span>))<\/p>\n
 <\/p>\n
in-out<\/strong><\/p>\n
Un parametro in-out \u00e8\u00a0un valore che viene passato alla funzione, viene modificata dalla funzione, e viene restituito dalla funzione per sostituire il valore originale.<\/p>\n
func<\/span>\u00a0swapVar (inout<\/span>\u00a0a :\u00a0Int<\/span>\u00a0,inout<\/span>\u00a0b :Int<\/span>){<\/p>\n
var<\/span>\u00a0temp = a<\/p>\n
a = b<\/p>\n
b = temp<\/p>\n
}<\/p>\n
var<\/span>\u00a0someInt =\u00a03<\/span><\/p>\n
var<\/span>\u00a0anotherInt =\u00a0107<\/span><\/p>\n
swapVar<\/span>(&someInt, &anotherInt)<\/p>\n
Leggere e scrivere \u00a0un file
\n<\/span><\/strong><\/p>\n
\/\/imposto come path di il desktop<\/p>\n
var<\/span> path\u00a0 = <\/span>NSSearchPathForDirectoriesInDomains<\/span>(<\/span>NSSearchPathDirectory.<\/span>DesktopDirectory<\/span>, <\/span>NSSearchPathDomainMask.AllDomainsMask, <\/span>true)[<\/span>0<\/span>] <\/span>as<\/span>String<\/p>\n
var<\/span> fileName = “file.txt”<\/span><\/p>\n
var<\/span> testoDaScrivrere = “Ciao mondo”<\/span><\/p>\n
var<\/span> pathCompleto = path<\/span> + “\/<\/span>\\(fileName<\/span>)“<\/span><\/p>\n
\/\/scrivo sul file<\/p>\n
testoDaScrivrere<\/span>.writeToFile<\/span>(pathCompleto<\/span>, atomically: true<\/span>, encoding: NSUTF8StringEncoding<\/span>, error: nil<\/span>)<\/p>\n
\/\/leggo dal file<\/p>\n
var<\/span>\u00a0 content = NSString<\/span>.stringWithContentsOfFile(pathCompleto<\/span>) as<\/span> String<\/span><\/p>\n
println(<\/span>content<\/span>)<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"
Ciao a tutti e bentornati in questa nuova lezione dedicata al nuovo linguaggio di casa Apple. \u00a0Swift tra le varie strutture dati mette a disposizione anche le struct, per chi non ricorda cosa sono le struct o come si usano pu\u00f2 leggersi questo\u00a0\u00a0nostro articolo:\u00a0Struct in C. struct\u00a0Persona { var\u00a0nome :String… Read more »<\/a><\/p>\n","protected":false},"author":1,"featured_media":5650,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2234],"tags":[2236,583,533,2252,1142,1124,1957,2271,2270,91,1621,2272,28,2238,29,2268,2274,2276,860,164,1864,110,2078,2273,1148,2180,1151,1065,2384,38,60,2269,2275,859,2237],"class_list":["post-5727","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-swift","tag-swift-xcode6-dev-iphone-ipad-mac-ios-apple-software","tag-apple","tag-apple-store","tag-casa-apple","tag-framework","tag-guida","tag-guide","tag-hack","tag-hacking","tag-hello-world","tag-imac","tag-imparare-a-programmare-applicazioni","tag-ios","tag-ios8","tag-ipad","tag-iphone6","tag-italiano","tag-keynote","tag-mac","tag-macbook","tag-macosx","tag-objective-c","tag-programmare","tag-programmatori","tag-sintassi","tag-soldi","tag-spiegazione","tag-steve-jobs","tag-swift","tag-tutorial","tag-twitter","tag-woz","tag-wwdc14","tag-xcode","tag-yosemite"],"yoast_head":"\nSwift: Sintassi di base parte tre - iProg<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.iprog.it\/blog\/swift\/swift-sintassi-base-parte-2\/\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Swift: Sintassi di base parte tre - iProg\" \/>\n<meta name=\"twitter:description\" content=\"Ciao a tutti e bentornati in questa nuova lezione dedicata al nuovo linguaggio di casa Apple. \u00a0Swift tra le varie strutture dati mette a disposizione anche le struct, per chi non ricorda cosa sono le struct o come si usano pu\u00f2 leggersi questo\u00a0\u00a0nostro articolo:\u00a0Struct in C. struct\u00a0Persona { var\u00a0nome :String... 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