Swift - Classes - Versionsgeschichte

134.3.86.14: /* Beispiele */

2023-02-03T19:51:35Z

Beispiele

134.3.86.14 am 4. Januar 2023 um 20:11 Uhr

2023-01-04T20:11:12Z

134.3.86.14: /* Unterschiede zu Structs */

2023-01-04T06:39:19Z

Unterschiede zu Structs

134.3.86.14: /* Unterschiede zu Structs */

2023-01-04T06:29:55Z

Unterschiede zu Structs

134.3.86.14 am 4. Januar 2023 um 06:28 Uhr

2023-01-04T06:28:07Z

134.3.86.14 am 3. Januar 2023 um 20:48 Uhr

2023-01-03T20:48:53Z

134.3.86.14: Die Seite wurde neu angelegt: „== Links == Swift (Programmiersprache) == Beispiele == main.swift let skeleton = Enemy() print(skeleton.health) skeleton.move(…“

2023-01-03T20:48:00Z

Die Seite wurde neu angelegt: „== Links == Swift (Programmiersprache) == Beispiele == main.swift <syntaxhighlight lang="Swift"> let skeleton = Enemy() print(skeleton.health) skeleton.move(…“

Neue Seite

== Links ==
Swift (Programmiersprache)

== Beispiele ==
main.swift
<syntaxhighlight lang="Swift">
let skeleton = Enemy()
print(skeleton.health)
skeleton.move()
skeleton.attack()

let dragon = Dragon()
dragon.wingSpan = 5
dragon.attackStrength = 15
dragon.move()
dragon.attack()
dragon.talk(speech: "My teeth are swords! My claws are speers! My wings are a hurricane")
</syntaxhighlight>

Enemy.swift
<syntaxhighlight lang="Swift">
class Enemy {
var health = 100
var attackStrength = 10

func move(){
print("Walk forwards")
}

func attack(){
print("Land a hit, does \(attackStrength) damage")
}
}
</syntaxhighlight>

Dragon.swift
<syntaxhighlight lang="Swift">
class Dragon: Enemy { // Inherits from Enemy class
var wingSpan = 2 // additional property

func talk(speech: String){ // additional function
print("Says: \(speech)")
}

override func move() { // override a function from superclass
print("Fly forwards")
}

override func attack() {
super.attack() // trigger function of superclass (parentclass)
print("Spits fire and does 10 damage")
}
}
</syntaxhighlight>

← Nächstältere Version		Version vom 3. Februar 2023, 19:51 Uhr
Zeile 100:		Zeile 100:
	Says: My teeth are swords! My claws are speers! My wings are a hurricane		Says: My teeth are swords! My claws are speers! My wings are a hurricane
	</pre>		</pre>
		+
		+	=== Instanzen von Klassen vergleichen ===
		+	'''How can I check if two instances of a class are the same?'''
		+
		+	In Swift, you can check if two instances of a class are the same by using the equality operator (==) or the identity operator (===).
		+
		+	The equality operator == checks if two instances have the same values for their properties. In order for this to work, the class must conform to the Equatable protocol and implement the == operator:
		+
		+	<syntaxhighlight lang="swift">
		+
		+	class MyClass: Equatable {
		+	let property: Int
		+
		+	static func == (lhs: MyClass, rhs: MyClass) -> Bool {
		+	return lhs.property == rhs.property
		+	}
		+	}
		+
		+	let instance1 = MyClass(property: 1)
		+	let instance2 = MyClass(property: 1)
		+	let isEqual = instance1 == instance2 // true
		+	</syntaxhighlight>
		+
		+	The identity operator === checks if two instances refer to the same memory address. It checks if two instances are the same instance.
		+
		+	<syntaxhighlight lang="swift">
		+
		+	let instance1 = MyClass(property: 1)
		+	let instance2 = MyClass(property: 1)
		+	let isIdentical = instance1 === instance2 // false
		+	</syntaxhighlight>
		+	Note: It is recommended to use the === operator if you need to check if two instances are the same instance, and use the == operator if you need to check if two instances have the same values for their properties.

@@ Zeile 1: / Zeile 1: @@
 == Links ==
   [[Swift (Programmiersprache)]]
 == Eigenschaften von Klassen und Vergleich zu Structs ==

@@ Zeile 2: / Zeile 2: @@
   [[Swift (Programmiersprache)]]
-== Unterschiede zu Structs ==
+== Eigenschaften von Klassen und Vergleich zu Structs ==
 * Classes werden by reference übergeben. Kopiert man die Instanz einer Klasse greift man technisch gesehen mit beiden Namen auf das selbe Objekt zu (siehe unten)
 * Das ist effektiv aber auch gefährlicher, da leichter Fehler entstehen können.
 * Apple empfielt wenn möglich mit Structs zu beginnen und nur wenn notwendig auf Klassen zurückzugreifen.
 == Beispiele ==

@@ Zeile 4: / Zeile 4: @@
 == Unterschiede zu Structs ==
 * Classes werden by reference übergeben. Kopiert man die Instanz einer Klasse greift man technisch gesehen mit beiden Namen auf das selbe Objekt zu (siehe unten)
 == Beispiele ==

← Nächstältere Version		Version vom 3. Januar 2023, 20:48 Uhr
Zeile 53:		Zeile 53:
	}		}
	</syntaxhighlight>		</syntaxhighlight>
		+
		+	Output:
		+	<pre>
		+	100
		+	Walk forwards
		+	Land a hit, does 10 damage
		+	Fly forwards
		+	Land a hit, does 15 damage
		+	Spits fire and does 10 damage
		+	Says: My teeth are swords! My claws are speers! My wings are a hurricane
		+	</pre>

@@ Zeile 1: / Zeile 1: @@
 == Links ==
-  Swift (Programmiersprache)
+  [[Swift (Programmiersprache)]]
 == Beispiele ==
 main.swift
 <syntaxhighlight lang="Swift">
-let skeleton = Enemy()
+let skeleton = Enemy(health: 100, attackStrength: 10)
-print(skeleton.health)
+print("Skeleton health: \(skeleton.health)")
 skeleton.move()
-let dragon = Dragon()
+// other than structs classes are passed by reference
 dragon.wingSpan = 5
 dragon.attackStrength = 15
@@ Zeile 21: / Zeile 29: @@
 <syntaxhighlight lang="Swift">
 class Enemy {
-     var health = 100
+     var health: Int
-     var attackStrength = 10
+     var attackStrength: Int
      func move(){
          print("Walk forwards")