103 lines
1.3 KiB
Swift
103 lines
1.3 KiB
Swift
import UIKit
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struct Circle {
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// 存储属性
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var radius: Double
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// 计算属性
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var diameter: Double {
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set(newDiameter) {
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radius = newDiameter / 2
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}
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get {
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radius * 2
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}
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}
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}
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var circle = Circle(radius: 5)
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print(circle.radius)
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print(circle.diameter)
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struct Point {
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var x: Int
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var y: Int
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// 初始化器设置初始值
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init() {
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x = 10
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y = 20
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}
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}
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var p = Point()
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struct Point3D {
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var x: Int
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var y: Int
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var z: Int
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}
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var p3d = Point3D(x: 10, y: 20, z: 30)
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struct PointA {
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var x: Int = 10
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var y: Int = 20
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}
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var pa = PointA()
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class Car {
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init() {
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print("Car init!")
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}
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func run() {
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print("Car is running!")
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}
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}
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class Person {
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lazy var car = Car()
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init() {
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print("Person init!")
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}
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func goOut() {
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car.run()
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}
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}
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let ps = Person()
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print("-----------")
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ps.goOut()
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struct PointB {
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var x = 0
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var y = 0
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lazy var z = 0
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}
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let pb = PointB()
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//print(pb.z)
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struct CircleA {
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var radius: Double {
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willSet {
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print("willSet", newValue)
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}
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didSet {
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print("didSet", oldValue, radius)
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}
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}
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init() {
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self.radius = 10
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print("Circle init!")
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}
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}
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var circleA = CircleA()
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circleA.radius = 10.5
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print(circleA.radius)
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