3e05a2b9a2a1

struct Point {
let x: Int
let y: Int
}

protocol Drawable {
func draw()
}

struct Circle: Drawable {
let radius: Double
let center: Point
func draw() {}
}

var circles = (1..<100_000).map { Circle(radius: Double($0), center: Point(x: $0, y: $0)) }
let begin0 = Date()
for circle in circles {
circle.draw()
}
let end0 = Date()
let time0 = end0.timeIntervalSince1970 - begin0.timeIntervalSince1970

let drawables: [Drawable] = (1..<100_000).map {Circle(radius: Double($0), center: Point(x: $0, y: $0)) }
let begin1 = Date()
for drawable in drawables {
drawable.draw()
}
let end1 = Date()
let time1 = end1.timeIntervalSince1970 - begin1.timeIntervalSince1970

Swift 性能相关

为什么说 Swift 性能相比较于 Objective-C 会更加 好 ？为什么在编译 Swift 的时候这么慢 ？如何更优雅的去写 Swift ？ Swift中的类型 首先...

Damonwong

11223 15 81

3e05a2b9a2a1

“不要把协议当做类型来处理” ,为啥我在playground里实测比实际类型性能更好呢？

Swift 性能相关

为什么说 Swift 性能相比较于 Objective-C 会更加 好 ？为什么在编译 Swift 的时候这么慢 ？如何更优雅的去写 Swift ？ Swift中的类型 首先...

Damonwong

11223 15 81