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我已經完成了在樹屋中用Swift課程構建一個簡單的iPhone應用程序，現在我想添加一個功能。我想阻止連續顯示相同的背景顏色和相同的有趣事實。我一直在努力，但我似乎無法弄清楚正確的方法。我嘗試在FactBook.swift和ColorWheel.swift中存儲一個randomIndex變量來保存生成的隨機數以獲得隨機事實/顏色。然後我使用do-while循環將該隨機數與變量進行比較，如果匹配，則生成另一個隨機數。但是，我無法在循環中獲得正確的範圍。如何防止在Swift中連續顯示相同的隨機顏色和隨機事實？
這裏是我的代碼，我對項目迄今：
ViewController.swift
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var funFactLabel: UILabel!
@IBOutlet weak var funFactButton: UIButton!
let factBook = FactBook()
let colorWheel = ColorWheel()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
funFactLabel.text = factBook.randomFact()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func showFunFact() {
var randomColor = colorWheel.randomColor()
view.backgroundColor = randomColor
funFactButton.tintColor = randomColor
funFactLabel.text = factBook.randomFact()
}
}
FactBook.swift
import Foundation
struct FactBook {
var randomIndex = 0
let factsArray = [
"Ants stretch when they wake up in the morning.",
"Ostritches can run faster than horses.",
"Olympic gold medals are actually mostly made of silver.",
"You are born with 300 bones; by the time you are an adult you will have 206.",
"It takes about 8 minutes for light from the Sun to reach the Earth.",
"Some bamboo plants can grow almost a meter in just one day.",
"Some penguins can leap 2-3 meters out of the water.",
"The state of Florida is bigger than England.",
"On average, it takes 66 days to form a new habit.",
"Mammoths still walked the Earth when the Great Pyramid was being built."
]
func randomFact() -> String {
var unsignedArrayCount = UInt32(factsArray.count)
var unsignedRandomNumber = arc4random_uniform(unsignedArrayCount)
var randomNumber = Int(unsignedRandomNumber)
// verify value of randomNumber
println(randomNumber)
return factsArray[randomNumber]
}
}
ColorWheel.swift
import Foundation
import UIKit
struct ColorWheel {
let colorsArray = [
UIColor(red: 90/255.0, green: 187/255.0, blue: 181/255.0, alpha: 1.0), //teal color
UIColor(red: 222/255.0, green: 171/255.0, blue: 66/255.0, alpha: 1.0), //yellow color
UIColor(red: 223/255.0, green: 86/255.0, blue: 94/255.0, alpha: 1.0), //red color
UIColor(red: 239/255.0, green: 130/255.0, blue: 100/255.0, alpha: 1.0), //orange color
UIColor(red: 77/255.0, green: 75/255.0, blue: 82/255.0, alpha: 1.0), //dark color
UIColor(red: 105/255.0, green: 94/255.0, blue: 133/255.0, alpha: 1.0), //purple color
UIColor(red: 85/255.0, green: 176/255.0, blue: 112/255.0, alpha: 1.0), //green color
]
func randomColor() -> UIColor {
var unsignedArrayCount = UInt32(colorsArray.count)
var unsignedRandomNumber = arc4random_uniform(unsignedArrayCount)
var randomNumber = Int(unsignedRandomNumber)
return colorsArray[randomNumber]
}
}