171 lines
2.4 KiB
Swift
171 lines
2.4 KiB
Swift
import UIKit
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import CoreGraphics
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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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struct Shape {
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var width: Int
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var side: Int {
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willSet {
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print("willSetSide", newValue)
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}
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didSet {
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print("didSetSide", oldValue, side)
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}
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}
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var girth: Int {
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set {
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width = newValue / side
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print("setGirth", newValue)
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}
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get {
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print("getGirth")
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return width * side
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}
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}
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func show() {
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print("width=\(width), side=\(side), girth=\(girth)")
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}
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}
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func test(_ num: inout Int) {
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num = 20
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}
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var s = Shape(width: 10, side: 4)
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test(&s.width)
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s.show()
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print("----------")
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test(&s.side)
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s.show()
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print("----------")
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test(&s.girth)
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s.show()
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struct CarA {
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static var count: Int = 0
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init() {
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CarA.count += 1
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}
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}
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let c1 = CarA()
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let c2 = CarA()
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let c3 = CarA()
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print(CarA.count)
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// 单例模式
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public class FileManager {
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// 延迟初始化
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public static let shared = FileManager()
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// 禁止外部初始化
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private init() {}
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// 方法
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func run() {
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}
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}
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FileManager.shared.run()
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