iOS8 Swift Cheat Sheet and Quick Reference Guide for iPhone Developers. Swift is the new programming language used in developing applications for Mac OS and iOS, introduced by Apple in 2014. Swift is not, at present a replacement for Objective-C. This Cheat Sheet was Submitted by Yaffari over at iOS-Blog and has credits to: http://kpbp.github.io/swiftcheatsheet/
Arrays
var colors = ["red", "blue"]
var moreColors: String[] = ["orange", "purple"] // explicit type
colors.append("green") // [red, blue, green]
colors += "yellow" // [red, blue, green, yellow]
colors += moreColors // [red, blue, green, yellow, orange, purple]
var days = ["mon", "thu"]
var firstDay = days[0] // mon
days.insert("tue", atIndex: 1) // [mon, tue, thu]
days[2] = "wed" // [mon, tue, wed]
days.removeAtIndex(0) // [tue, wed]
Classes
class Counter {
var count: Int = 0
func inc() {
count++
}
func add(n: Int) {
count += n
}
func printCount() {
println("Count: \(count)")
}
}
var myCount = Counter()
myCount.inc()
myCount.add(2)
myCount.printCount() // Count: 3
Conditionals
//IF STATEMENT
let happy = true
if happy {
println("We're Happy!")
} else {
println("We're Sad :('")
}
// We're Happy!
let speed = 28
if speed <= 0 {
println("Stationary")
} else if speed <= 30 {
println("Safe speed")
} else {
println("Too fast!")
}
// Safe speed
//SWITCH STATEMENT
let n = 2
switch n {
case 1:
println("It's 1!")
case 2...4:
println("It's between 2 and 4!")
case 5, 6:
println("It's 5 or 6")
default:
println("Its another number!")
}
// It's between 2 and 4!
//IF STATEMENT
let happy = true
if happy {
println("We're Happy!")
} else {
println("We're Sad :('")
}
// We're Happy!
let speed = 28
if speed <= 0 {
println("Stationary")
} else if speed <= 30 {
println("Safe speed")
} else {
println("Too fast!")
}
// Safe speed
//SWITCH STATEMENT
let n = 2
switch n {
case 1:
println("It's 1!")
case 2...4:
println("It's between 2 and 4!")
case 5, 6:
println("It's 5 or 6")
default:
println("Its another number!")
}
// It's between 2 and 4!
Constants
let myInt = 1
myInt = 2 // compile-time error!
let myInt = 1
myInt = 2 // compile-time error!
Dictionaries
var days = ["mon": "monday", "tue": "tuseday"]
days["tue"] = "tuesday" // change the value for key "tue"
days["wed"] = "wednesday" // add a new key/value pair
var moreDays: Dictionary = ["thu": "thursday", "fri": "friday"]
moreDays["thu"] = nil // remove thu from the dictionary
moreDays.removeValueForKey("fri") // remove fri from the dictionary
var days = ["mon": "monday", "tue": "tuseday"]
days["tue"] = "tuesday" // change the value for key "tue"
days["wed"] = "wednesday" // add a new key/value pair
var moreDays: Dictionary = ["thu": "thursday", "fri": "friday"]
moreDays["thu"] = nil // remove thu from the dictionary
moreDays.removeValueForKey("fri") // remove fri from the dictionary
Enums
enum CollisionType: Int {
case Player = 1
case Enemy = 2
}
var type = CollisionType.Player
enum CollisionType: Int {
case Player = 1
case Enemy = 2
}
var type = CollisionType.Player
For Loops
for var index = 1; index < 3; ++index {
// loops with index taking values 1,2
}
for index in 1..3 {
// loops with index taking values 1,2
}
for index in 1...3 {
// loops with index taking values 1,2,3
}
let colors = ["red", "blue", "yellow"]
for color in colors {
println("Color: \(color)")
}
// Color: red
// Color: blue
// Color: yellow
let days = ["mon": "monday", "tue": "tuesday"]
for (shortDay, longDay) in days {
println("\(shortDay) is short for \(longDay)")
}
// mon is short for monday
// tue is short for tuesday
for var index = 1; index < 3; ++index {
// loops with index taking values 1,2
}
for index in 1..3 {
// loops with index taking values 1,2
}
for index in 1...3 {
// loops with index taking values 1,2,3
}
let colors = ["red", "blue", "yellow"]
for color in colors {
println("Color: \(color)")
}
// Color: red
// Color: blue
// Color: yellow
let days = ["mon": "monday", "tue": "tuesday"]
for (shortDay, longDay) in days {
println("\(shortDay) is short for \(longDay)")
}
// mon is short for monday
// tue is short for tuesday
Functions
func iAdd(a: Int, b: Int) -> Int {
return a + b
}
iAdd(2, 3) // returns 5
func eitherSide(n: Int) -> (nMinusOne: Int, nPlusOne: Int) {
return (n-1, n+1)
}
eitherSide(5) // returns the tuple (4,6)
func iAdd(a: Int, b: Int) -> Int {
return a + b
}
iAdd(2, 3) // returns 5
func eitherSide(n: Int) -> (nMinusOne: Int, nPlusOne: Int) {
return (n-1, n+1)
}
eitherSide(5) // returns the tuple (4,6)
Logical Operators
var happy = true
var sad = !happy // logical NOT, sad = false
var everyoneHappy = happy && sad // logical AND, everyoneHappy = false
var someoneHappy = happy || sad // logical OR, someoneHappy = true
var happy = true
var sad = !happy // logical NOT, sad = false
var everyoneHappy = happy && sad // logical AND, everyoneHappy = false
var someoneHappy = happy || sad // logical OR, someoneHappy = true
Printing
let name = "swift"
println("Hello")
println("My name is \(name)")
print("See you ")
print("later")
/*
Hello
My name is swift
See you later
*/
let name = "swift"
println("Hello")
println("My name is \(name)")
print("See you ")
print("later")
/*
Hello
My name is swift
See you later
*/
Strings
var myString = "a"
let myImmutableString = "c"
myString += "b" // ab
myString = myString + myImmutableString // abc
myImmutableString += "d" // compile-time error!
let count = 7
let message = "There are \(count) days in a week"
var myString = "a"
let myImmutableString = "c"
myString += "b" // ab
myString = myString + myImmutableString // abc
myImmutableString += "d" // compile-time error!
let count = 7
let message = "There are \(count) days in a week"
Variables
var myInt = 1
var myExplicitInt: Int = 1 // explicit type
var x = 1, y = 2, z = 3 // declare multiple integers
myExplicitInt = 2 // set to another integer value
var myInt = 1
var myExplicitInt: Int = 1 // explicit type
var x = 1, y = 2, z = 3 // declare multiple integers
myExplicitInt = 2 // set to another integer value
Reference from:http://swift-cheatsheet.co.uk/
No comments:
Post a Comment