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iOSΞϓϦ։ൃऀ͔Βݟͨ
Kotlin
2017/06/29
ୈ6ճKotlinษڧձ ˏ Sansan
Koishi
Koichiro Oishi, 2017/6/29 1
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ࣗݾհ
େੴ ߂Ұ
γεςϜɾΞφϥΠζגࣜձࣾ
iOSΞϓϦ։ൃऀ
ΞΧϯτؔ࿈
* @mego_
* koishi
Koichiro Oishi, 2017/6/29 2
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ίϯςΩετ
iOSΞϓϦΤϯδχΞͰ͢ɻ
Objective-CͱSwiftࣝ͋Δ(͋Δఔ)
JavaͳΜͱͳͬͯ͘Δɻ
Kotlin໊લͱͳΜͱͳ͘Γ্͕ΓΛɻ
Koichiro Oishi, 2017/6/29 3
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Kotlin͔Θ͍͍
ͱ͍͏͜ͱΛઌͷษڧձͰΓ·ͨ͠
Koichiro Oishi, 2017/6/29 4
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ͦͯ͠
SwiftͱࣅͯΔ
ͱ͍͏͜ͱᷚͰΓ·ͨ͠
Koichiro Oishi, 2017/6/29 5
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ຊͦΜͳϨϕϧͰݟͨ
KotlinͱSwiftͷҧ͍Λ
ൃද͖ͤͯ͞·͢ɻ
Koichiro Oishi, 2017/6/29 6
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ࢀߟจݙ
Swift
࣮ફೖ
ஶऀͷ1ਓɺੴ͞Μ͔ΒαΠ
ϯΒ͍·ͨ͠ɻ
Koichiro Oishi, 2017/6/29 7
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ࢀߟจݙ
Kotlin
ελʔτϒοΫ
௨শʮ͜ຊʯ
ஶऀͷͨΖ͏͞Μ͔ΒαΠϯ
Β͍·ͨ͠ɻ
Koichiro Oishi, 2017/6/29 8
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ࢀߟจݙ
ೖ·Ͱͷ
Kotlin
ॿಡຊ
ࢲʹͱͬͯྑͦ͞͏Ͱ͢
ͪ͜ΒΛϕʔεʹSwiftͱൺֱ
͍͖ͯ͠·͢
Koichiro Oishi, 2017/6/29 9
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ຊͰ͢ɻ
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ΞδΣϯμ
• جຊจ๏(ͬ͘͟Γ)
• Null҆શ
• ؔ, ΦϒδΣΫτ(γϯάϧτϯ),
ίϯύχΦϯΦϒδΣΫτ(static)
• σʔλΫϥε
• Extension(֦ுؔɺ֦ுϓϩύςΟ)
Koichiro Oishi, 2017/6/29 11
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͜ͷ͋ͨΓΛKotlinͱSwift
Ͱൺֱͯ͠Έ·͢
Koichiro Oishi, 2017/6/29 12
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جຊจ๏ - มͷએݴ1
Kotlin
val num : Int = 1
var num2 : Int = 2
Swift
let num: Int = 1
var num2: Int = 2
valͱletఆ
1 Kotlinॿಡຊ p.28
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جຊจ๏ - มͷએݴ
Kotlin
val num = 1
var num2 = 2
Swift
let num = 1
var num2 = 2
ܕͷলུ(ܕਪ)
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جຊจ๏ - whenࣜ2
Kotlin
val value = 1
val str = when(value) {
1-> "one"
2-> "two"
else -> "other"
}
2 Kotlinॿಡຊ p.30
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جຊจ๏ - whenࣜ
Swift
let value = 1
let str = {
switch value {
case 1:
"one"
case 2:
"two"
default:
"other"
}
}
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Null҆શ - Nullෆڐ༰ܕ3
Kotlin
var a: String = "abc"
a = null // => ίϯύΠϧΤϥʔ
Swift
var a: String = "abc"
a = nil // => ίϯύΠϧΤϥʔ
3 Kotlinॿಡຊ p.33
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Null҆શ - Nullڐ༰ܕ
Kotlin
var b: String? = "abc"
b = null // => OK
Swift
var b: String? = "abc"
b = nil // => OK
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Null҆શ - Null νΣοΫͱ҆શͳݺͼग़͠
Kotlin
Null ෆڐ༰ܕͷࢀর
var a: String = "abc"
val l : Int = a.length // => OK
Null ڐ༰ܕͷࢀর
var b: String? = "abc"
val l : Int = b.length // => ίϯύΠϧΤϥʔ
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Null҆શ - Null ڐ༰ܕͷϝιουݺͼग़͠
Kotlin
Null ෆڐ༰ܕͷࢀর
var b: String? = "abc"
val l : Int = if(b != null) b.length else -1
Null ڐ༰ܕͷࢀর
val l : Int? = b?.length
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Null҆શ - Null ڐ༰ܕͷϝιουݺͼग़͠
Swift
Null ෆڐ༰ܕͷࢀর
var b: String? = "abc"
let l: Int = b?.characters.count ?? -1
Null ڐ༰ܕͷࢀর
let l: Int? = b?.characters.count
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Null҆શ - ΤϧϏεԋࢉࢠ
Kotlin
val l: Int = b?.length ?: -1
Swift
let l: Int = b?.characters.count ?? -1
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Null҆શ - !!ԋࢉࢠ
Kotlin
val l: Int = b!!.length
b͕Null(nil)ͩͬͨΒ
KotlinͰNullPointerException͕ൃੜ
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Null҆શ - !!ԋࢉࢠ
Swift
let l: Int = b!.characters.count
ڧ੍Ξϯϥοϓ
b͕Null(nil)ͩͬͨΒ
SwiftͰΫϥογϡ͠·͢
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Null҆શ - Swiftͷ߹
if let count = b?.characters.count {
print(count) //ඇoptionalܕ
}
if letͷϒϩοΫͰNullෆڐ༰ܕ(ඇoptionalܕ)
ͱͯ͑͠Δ
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Null҆શ - Swiftͷ߹
guard let count = b?.characters.count else {
return
}
print(count) //ඇoptionalܕ
guardจҎ߱ͰNullෆڐ༰ܕ(ඇoptionalܕ)ͱ͠
ͯ͑Δ
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ؔ4
Kotlin
fun add(x: Int, y: Int): Int {
return x + y
}
Swift
func add(x: Int, y: Int) -> Int {
return x + y
}
4 Kotlinॿಡຊ p.36
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ΦϒδΣΫτ(γϯάϧτϯ)5
Kotlin
ఆٛ
object DataProviderManager {
fun registerDataProvider(provider: DataProvider) {
// ... }
}
ݺͼग़͠
DataProviderManager.registerDataProvider(...)
5 Kotlinॿಡຊ p.47
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ΦϒδΣΫτ(γϯάϧτϯ)
Swift
ఆٛ
class DataProviderManager {
static let sharedInstance = DataProviderManager()
private init() { ... }
func registerDataProvider(provider: DataProvider) {
}
}
ݺͼग़͠
DataProviderManager.sharedInstance.registerDataProvider(...)
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ίϯύχΦϯΦϒδΣΫτ(static)
Kotlin
ఆٛ
class MyClass {
companion object Factory {
fun create(): MyClass = MyClass()
}
}
ݺͼग़͠
val instance = MyClass.create()
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ίϯύχΦϯΦϒδΣΫτ(static)
Swift
ఆٛ
class MyClass {
static func create() -> MyClass {
return MyClass()
}
}
ݺͼग़͠
let test = MyClass.create()
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σʔλΫϥε6
Kotlin
data class Person(val id: Long, var name: String)
KotlinʹPairTripleͳͲ͋Δ͕ɺ
ม໊͚ͭΒΕͳ͍ͬΆ͍
Swift
typealias Person = (id: Int, name: String)
σʔλΫϥε = શʹSwiftͷλϓϧͰͳ͘
SwiftͷStructͬΆ͋͞Δʁ
6 Kotlinॿಡຊ p.52
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Extension - ֦ுؔ(Extension Function)7
Kotlin
fun String.appendBeer() : String = "${this}beer!"
println("I like".appendBeer()) // => I like beer!
Swift
extension String {
func appendBeer() -> String {
return "\(self)beer!"
}
}
print("I like".appendBeer())
7 Kotlinॿಡຊ p.55
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Extension - ֦ுϓϩύςΟ(Extension Properties)
Kotlin
ఆٛ
val List.lastIndex: Int
get() = size - 1
ݺͼग़͠
val arr = listOf(1,2,3)
println(arr.lastIndex) //=> 2
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Extension - ֦ுϓϩύςΟ(Extension Properties)
Swift
ఆٛ
extension Array {
var lastIndex: Int {
return self.count - 1
}
}
ݺͼग़͠
let arr = [1,2,3]
print(arr.lastIndex) //=> 2
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ࠓճ͜͜·ͰͰ͕͢ɺ
͜Ε͔ΒKotlin͍͖ͬͯ·͢
ߴ֊ؔɾϥϜμɾΞΫηε੍ݶ͋ͨΓ
औΓ্͔͛ͨͬͨͷͰ͕͢ϘϦϡʔϜతʹ…
Koichiro Oishi, 2017/6/29 36
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SwiftΛ͋·Γ͝ଘͳ͍ํɺ
͍͔͕Ͱͨ͠Ͱ͠ΐ͏͔
Koichiro Oishi, 2017/6/29 37
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Swift
͔Θ͍͍ͷͰ?
ͱݴͬͯΈ͔ͨͬͨͷͰ͢
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࠷ޙʹ
Kotlinͷ͕͜͜ྑ͍
ͱ͔ڭ͍͑ͯͩ͘͞ʂ
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ͪͳΈʹ
͜ͷαΠτͰKotlinͱSwiftͷҧ
͍͕·ͱ·ͬͯ·͢Ͷɻ
Swift is like Kotlin
http://nilhcem.com/swift-is-
like-kotlin/
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͝੩ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ɻ
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