Strings
“Swift strings are represented by the String type, which in turn represents a collection of values of Character type.”
“Unicode-compliant way to work with text in your code. ”
“Swift’s String type is bridged seamlessly to Foundation’s NSString class. ”
“Each Character value represents a single Unicode character.”
“+” to concate...
Wednesday, July 16, 2014
Swift - Some basic about swift / let var in swift [ swift programming language apple ios]
basic
no smicolon(“Semicolons are required, however, if you want to write multiple separate statements on a single line:”
Excerpt From: Apple Inc. “The Swift Programming Language.” iBooks. https://itun.es/in/jEUH0.l), no backet for if , for loop, while loop
let - constant
var for variable
defualt compulsory for switch, no break
All swift code...
Swift - Basic data types in swift [ swift programming language apple ios]
Integer
UInt8, Int32,Int64,UInt32,UInt64 etc
Float
Double,Float
“Double has a precision of at least 15 decimal digits, whereas the precision of Float can be as little as 6 decimal digits.”
BOOL
Bool
Boolean constant values, true and false:”
Swift’s type safety prevents non-Boolean values from being be substituted for Bool. The following...
Swift - Generics (like template in c++) [ swift programming language apple ios]
Generics (like template in c++)
“func repeat<ItemType>(item: ItemType, times: Int) -> ItemType[] {
var result = ItemType[]()
for i in 0..times {
result += item
}
return result
}
repeat("knock", 4)”
“// Reimplement the Swift standard library's optional...
Swift - category in Swift / Extension in swift [ swift programming language apple ios]
Extension like category
“Use extension to add functionality to an existing type, such as new methods and computed properties. ”
“extension Int: ExampleProtocol {
var simpleDescription: String {
return "The number \(self)"
}
mutating func adjust() {
self +=...
Swift - Protocol in swift [ swift programming language apple ios]
Protocol
“Classes, enumerations, and structs can all adopt protocols.”
protocol ExampleProtocol {
var simpleDescription: String { get }
mutating func adjust()
}
struct SimpleStructure: ExampleProtocol {
var simpleDescription: String = "A simple structure"
mutating func adjust() {
...
Swift - enum / Enumeration [ swift programming language apple ios]
enum
enum like classes and have methods inside it.
enum Rank: Int {
case Ace = 1
case Two, Three, Four, Five, Six, Seven, Eight, Nine, Ten
case Jack, Queen, King
func simpleDescription() -> String {
switch self {
case .Ace:
...
Swift - Classes / Classes in Swift [ swift programming language apple ios]
Classes:-
use class keyword followed by classname
class Shape {
var numberOfSides = 0
func simpleDescription() -> String {
return "A shape with \(numberOfSides) sides."
}
}
var shape = Shape()
shape.numberOfSides = 7
var shapeDescription = shape.simpleDescription()
class...
Swift - Function declaration and defination [ swift programming language apple ios]
Function declaration and defination
“Use func to declare a function.”
“func greet(name: String, day: String) -> String {
return "Hello \(name), today is \(day)."
}”
“Functions can be nested.”
Excerpt From: Apple Inc. “The Swift Programming Language.” iBooks. https://itun.es/in/jEUH0.l
return multiple values
“func getGasPrices()...
