本篇内容介绍了“如何使用swift类方法”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！
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//类的实例方法
class Counter {
var count = 0
func increment() {
count += 1
}
func increment(by count: Int) {
self.count += count
}
func reset() {
count = 0
}
}
let counter = Counter()
print(counter.count)
//0
counter.increment()
print(counter.count)
//1
counter.increment(by: 10)
print(counter.count)
//11
counter.reset()
print(counter.count)
//0//结构体修改属性 mutating
struct Point {
var x = 0.0, y = 0.0
mutating func moveBy(x deltaX: Double, y deltaY: Double) {
x += deltaX
y += deltaY
}
}
var point = Point(x: 1.0, y: 1.0)
point.moveBy(x: 2.0, y: 2.0)
print(point)
//Point(x: 3.0, y: 3.0)//枚举修改属性 mutating
enum TriStateSwitch {
case off, low, high
mutating func next() {
switch self {
case .off:
self = .low
case .low:
self = .high
case .high:
self = .off
}
}
}
var ovenLight = TriStateSwitch.low
print(ovenLight)
//low
ovenLight.next()
print(ovenLight)
//high
ovenLight.next()
print(ovenLight)
//off//类方法
class Tool {
static func getSize() -> (Int, Int) {
return (100, 100)
}
}
print(Tool.getSize())
//(100, 100)//结构体用下标访问 subscript
struct TimesTable {
let multiplier: Int
subscript(index: Int) -> Int {
return multiplier * index
}
}
let threeTimesTable = TimesTable(multiplier: 3)
print(threeTimesTable[4])
//12//类用下标访问 subscript
class Matrix {
let rows: Int, cols: Int
var grid: [Double]
init(rows: Int, cols: Int) {
self.rows = rows
self.cols = cols
grid = Array(repeating: 0.0, count: rows * cols)
}
func indexIsValid(row: Int, col: Int) -> Bool {
return row >= 0 && row < rows && col >= 0 && col < cols
}
subscript(row: Int, col: Int) -> Double {
get {
assert(indexIsValid(row: row, col: col), "Index out of range")
return grid[(row * cols) + col]
}
set {
assert(indexIsValid(row: row, col: col), "Index out of range")
grid[(row * cols) + col] = newValue
}
}
}
var matrix = Matrix(rows: 2, cols: 2)
print(matrix.grid)
//[0.0, 0.0, 0.0, 0.0]
matrix[0, 0] = 1.0
matrix[0, 1] = 2.0
matrix[1, 0] = 3.0
matrix[1, 1] = 4.0
print(matrix.grid)
//[1.0, 2.0, 3.0, 4.0]//枚举用下标访问 subscript
enum Direction: Int {
case top, right, bottom, left
static subscript(n: Int) -> Direction {
return Direction(rawValue: n)!
}
}
let right = Direction[1]
print(right)
//right“如何使用swift类方法”的内容就介绍到这里了，感谢大家的阅读。如果想了解更多行业相关的知识可以关注亿速云网站，小编将为大家输出更多高质量的实用文章！
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原文链接：https://my.oschina.net/artwl/blog/5020702
