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  • swift语言点评十二-Subscripts

    Classes, structures, and enumerations can define subscripts, which are shortcuts for accessing the member elements of a collection, list, or sequence.

    下标的形式和函数相同,并且set和get合一

    subscript(row: Int, column: Int) -> Double

    比较:

    In addition to simple properties that are stored, properties can have a getter and a setter.

    1. class EquilateralTriangle: NamedShape {
    2. var sideLength: Double = 0.0
    3. init(sideLength: Double, name: String) {
    4. self.sideLength = sideLength
    5. super.init(name: name)
    6. numberOfSides = 3
    7. }
    8. var perimeter: Double {
    9. get {
    10. return 3.0 * sideLength
    11. }
    12. set {
    13. sideLength = newValue / 3.0
    14. }
    15. }
    16. override func simpleDescription() -> String {
    17. return "An equilateral triangle with sides of length (sideLength)."
    18. }
    19. }
    20. var triangle = EquilateralTriangle(sideLength: 3.1, name: "a triangle")
    21. print(triangle.perimeter)
    22. triangle.perimeter = 9.9
    23. print(triangle.sideLength)
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  • 原文地址:https://www.cnblogs.com/feng9exe/p/8716471.html
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