Question

我有一份报价清单。我希望有一个标签，每24小时更改一个新的报价。我怎样才能做到这一点？我怎么能管理一天？

我知道我可以使用API，但我想使用自己的引号，而我自己也无法创建API。

Answer 1

假设您有一系列引号：

let numberOfQuotes = 3
let quotes = ["quote a", "quote b", "quote c"]

override func viewDidLoad() {
    _ = Timer.scheduledTimer(timeInterval: TimeInterval(60),
                                               target: self,
                                               selector: #selector(self.updateQuote),
                                               userInfo: nil,
                                               repeats: true)

}

func updateQuote() {
    let lastUpdate = UserDefaults.standard.object(forKey: "lastUpdate") as? Date
    if lastUpdate != nil {
       let date1:Date = Date() // Same you did before with timeNow variable
       let date2: Date = Date(timeIntervalSince1970: lastUpdate)

       let calender:Calendar = Calendar.current
       let components: DateComponents = calender.dateComponents([.year, .month, .day, .hour, .minute, .second], from: date1, to: date2)

       // you can use components month, hour, second.... to update your message, in your case, we will day

       if components.day! >= 1 {
          UserDefaults.standard.set(Date(), forKey: "lastUpdate")
          yourLabel.text = quotes[randomInt(0,numberOfQuotes)]
       }

    } else { //firstTime running
          UserDefaults.standard.set(Date(), forKey: "lastUpdate")
          yourLabel.text = quotes[randomInt(0,numberOfQuotes)]
    }
}

func randomInt(min: Int, max:Int) -> Int {
    return min + Int(arc4random_uniform(UInt32((max - 1) - min + 1)))
}

此代码按原样，按照您的描述，它完全符合您的要求。

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