Swift中static和class关键字的深入讲解

struct Point {
 let x: Double
 let y: Double
// 修饰存储属性
 static let zero = Point(x: 0, y: 0)
// 修饰计算属性
 static var ones: [Point] {
  return [Point(x: 1, y: 1)]
 }
// 修饰类型方法
 static func add(p1: Point, p2: Point) -> Point {
  return Point(x: p1.x + p2.x, y: p1.y + p2.y)
 }
}

class MyClass {
// 修饰计算属性
 class var age: Int {
  return 10
 }
// 修饰类方法
 class func testFunc() {
  
 }
}

//class let name = "jack" error: Class stored properties not supported in classes; did you mean 'static'?

protocol MyProtocol {
 static func testFunc()
}

struct MyStruct: MyProtocol {
 static func testFunc() {
  
 }
}

enum MyEnum: MyProtocol {
 static func testFunc() {
  
 }
}

class MyClass: MyProtocol {
 static func testFunc() {
  
 }
}

class MyClass {
 class func testFunc() {
  
 }
 
 static func testFunc1() {
  
 }
}

class MySubClass: MyClass {
 override class func testFunc() {
  
 }
 
// error: Cannot override static method
// override static func testFunc1() {
//
// }
}

class SingleClass {
 static let shared = SingleClass()
 private init() {}
}