swift_playground

swift_playground

Swift Playground：在 Playground 中探索和评估 Swift 代码（复制和粘贴）

这些例子来自：

https://developer.apple.com/library/ios/recipes/xcode_help-source_editor/chapters/ExploringandEvaluatingSwiftCodeinaPlayground.html

在上面的页面上，代码示例是图像，这非常烦人。我在这里提供它们，以便您可以通过复制和粘贴来节省时间：

 // Playground - noun: a place where people can play

import UIKit

var str = "Hello, playground"

let triple: Int -> Int = {
    (number: Int) in
    
    let result = 3 * number
    number
    
    return number
}
triple(3)


let listOfNumbers = 1...5
var sum = 0
for atNum in listOfNumbers {
    sum += atNum
}
sum


var j = 2
for var i = 0; i < 5; ++i {
    j += j * i
}
j

////////

// let j = 3  // ERROR: Invalid redeclaration of 'j'

////////

let size = (20, 40)
switch size {
case let (width, height) where width == height:
    println("square with sides(width)")
    width
    height
case (1...10, 1...10):
    println("")
case let (width, height):
    println("rectangle with width (width) and height (height)")
    width
    height
}


////////

let frame = CGRect(x: 0, y: 0, width: 150 , height: 150)
let customView = UIView(frame: frame)  // CheckBox(frame: frame)  //  Switched to a UIView so the example would work
customView.backgroundColor = UIColor.blueColor()
customView.tintColor = UIColor.orangeColor()
//customView.isChecked = true

////////

j = 2
for var i = 0; i < 5; ++i {
    j += j * i
}
j


import XCPlayground

for (_, color) in enumerate([UIColor.orangeColor(), UIColor.greenColor()]) {
        customView.backgroundColor = color
    XCPShowView("customView", customView)
}

* Swift 是一种专有语言。苹果世界是一个志愿者监狱。