好久沒寫過文章，隨便擼下碼，結(jié)合Swift的特性及一些時(shí)間序列的思路。通過時(shí)間段來獲取對(duì)應(yīng)的星座。當(dāng)然還有其他更加簡(jiǎn)單的方式，大家可以搜索下。

星座時(shí)間段

肺話少說，上代碼

//
//  Constellation.swift
//
//  Created by 小黑Swift on 2017/7/11.
//  Copyright ? 2017年 Swift. All rights reserved.
//

import Foundation

struct Constellation {
    
    private enum ConstellationType:String {
        case 白羊座, 金牛座, 雙子座, 巨蟹座, 獅子座, 處女座,
             天秤座, 天蝎座, 射手座, 摩羯座, 水瓶座, 雙魚座
    }
    
    private static let constellationDict:[ConstellationType :String] = [.白羊座: "3.21-4.19",
                                                                        .金牛座: "4.20-5.20",
                                                                        .雙子座: "5.21-6.21",
                                                                        .巨蟹座: "6.22-7.22",
                                                                        .獅子座: "7.23-8.22",
                                                                        .處女座: "8.23-9.22",
                                                                        .天秤座: "9.23-10.23",
                                                                        .天蝎座: "10.24-11.22",
                                                                        .射手座: "11.23-12.21",
                                                                        .摩羯座: "12.22-1.19",
                                                                        .水瓶座: "1.20-2.18",
                                                                        .雙魚座: "2.19-3.20"]
    
    /// 日期 -> 星座
    ///   - parameter date: 日期
    ///   - returns:  星座名稱
    public static func calculateWithDate(date: Date) -> String? {
        
        let timeInterval = date.timeIntervalSince1970
        let OneDay:Double = 86400
        
        let currConstellation = constellationDict.filter {
            
            let timeRange = getTimeRange(date: date, timeRange: $1)
            let startTime = timeRange.0
            let endTime = timeRange.1 + OneDay
            
            return timeInterval > startTime && timeInterval < endTime
        } // 摩羯座這家伙跨年必定不滿足
        
        return currConstellation.first?.key.rawValue ?? "摩羯座" 
    }
    
    /// f.獲取開始、結(jié)束時(shí)間
    private static func getTimeRange(date:Date, timeRange: String) -> (TimeInterval, TimeInterval) {
        
        /// f.1 獲取當(dāng)前年份
        func getCurrYear(date:Date) -> String {
            
            let dm = DateFormatter()
            dm.dateFormat = "yyyy."
            let currYear = dm.string(from: date)
            return currYear
        }

        /// f.2 日期轉(zhuǎn)換當(dāng)前時(shí)間戳
       func toTimeInterval(dateStr: String) -> TimeInterval? {
            
            let dm = DateFormatter()
            dm.dateFormat = "yyyy.MM.dd"
            
            let date = dm.date(from: dateStr)
            let interval = date?.timeIntervalSince1970
            
            return interval
        }

        let timeStrArr = timeRange.components(separatedBy: "-")
        let dateYear = getCurrYear(date: date)
        let startTimeStr = dateYear + timeStrArr.first!
        let endTimeStr = dateYear + timeStrArr.last!

        let startTime = toTimeInterval(dateStr: startTimeStr)!
        let endTime = toTimeInterval(dateStr: endTimeStr)!
        
        return (startTime, endTime)
    }
}

使用

let now = Date()
let constellationName = Constellation.calculateWithDate(date: now)! // 當(dāng)前時(shí)間所在星座

來個(gè)簡(jiǎn)單的Rx?? 通過日期選擇器 獲取對(duì)應(yīng) 星座

Simulator Screen Shot 2017年7月11日 下午12.21.58.png

代碼：

import UIKit
import RxCocoa
import RxSwift

class ConstellationViewController: UIViewController {
    
    @IBOutlet weak var constellationLabel: UILabel!
    @IBOutlet weak var datePicker: UIDatePicker!
    
    var bag = DisposeBag()
    var constellationName = Variable("??")
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        datePicker.rx.date.subscribe(onNext: { [weak self] date in
            
            let conName = Constellation.calculateWithDate(date: date)!
            self?.constellationName.value = conName

        }).addDisposableTo(bag)

        constellationName.asObservable().bindTo(constellationLabel.rx.text).addDisposableTo(bag)      
    }
}