ios - Swift:有关 JSON 解析的帮助

Question

我是 iOS 编程新手，有一个关于 JSON 解析的小问题。

"data": [
{
  "merchantId": "56",
"timings": [
    [
      "11:00 AM",
      "11:00 PM"
    ]
  ],
"tags": [
    "dine,north chinese"
  ],
"offers": [
    {
      "approvedBy": "56",
      "locationId": "56",
      "description": "Get 15% Off",
      "finePrint": "• Cannot be combined with other offers.",
      "audience": "all",
      "status": "live",
      "createdAt": "2016",
      "updatedAt": "2016",
      "offerType": "Discount",
      "discount": "15",
      "maxDiscount": 0,
      "id": "56"
    },
    {
      "approvedBy": "56023",
      "locationId": "56023",
      "description": "Get 25% Off",
      "finePrint": "• Cannot be combined with other offers",
      "audience": "all",
      "status": "live",
      "createdAt": "2016",
      "updatedAt": "2016",
      "hangoutId": "",
      "offerType": "PercentDiscount",
      "discount": "25",
      "amount": 0,
      "maxDiscount": 0,
      "id": "5623"
    },
};

我想下载上面的JSON数据，解析它并将其显示在标签中。我可以使用以下代码下载并显示merchantId:

 let JSONRespone = response.result.value as? [String:AnyObject]
            if JSONRespone != nil {

                let datarray = JSONRespone!["data"] as? [[String:AnyObject]]
                if datarray != nil {
                    for data in datarray! {

                        let anObject = SomeObject()

                        let merchantId = data["merchantId"] as? String
                        if merchantId != nil {
                            anObject.merchantidentity = merchantId!
                        }

如果我对计时和标签使用相同的代码，它不会显示任何内容。当我尝试在控制台中显示结果时，它显示“nil”。

除此之外，我如何在三个不同的标签中打印“优惠”中的“描述”。我只能打印其中的一张。有人可以帮我显示以下内容吗？提前致谢。

Answer 1

注意，offers是一个offers数组，数组中的每一项都是一个字典，所以你最好创建一个新的对象“class”Offer，其属性代表offers数组中每个字典中的每个键

所以你的 SomeObject 类应该看起来像这样

class SomeObject {

   var name: String!
   var imageURLString: String!
   var address: String!
   var area: String!
   var awardedLoyalty: Int!
   var cashbackPercentage: Double!
   var city: String!
   var contactNumber: String!
   var createdAt: String!
   var distanceFromUser: Double!
   var id: String!
   var isDiscounted: Bool!
   var isFavorite: Bool!
   var latitude: Double!
   var logo: String!
   var longitude: Double!
   var merchantId: String!
   var offers: [Offer]! // this is an array of offers, each offer in the array is of type (Offer()), which you must create your self, check Offer.swift file, it's a class Offer
   var tags: [String]!
   var timings: [String]!
   var updatedAt: String!

}

而SomeObject.offers是Offer数组

所以你的 Offer 对象“类”应该类似于

class Offer {

    var amount: Double!
    var approvedBy: String!
    var audience: String!
    var createdAt: String!
    var description: String!
    var discount: Double!
    var finePrint: String!
    var hangoutId: String!
    var id: String!
    var locationId: String!
    var maxDiscount: Double!
    var offerType: String!
    var status: String!
    var updatedAt: String!
}

还要注意标签是一个字符串数组，每个字符串都是一些用“，”分隔的标签后端开发人员应该将其设置为每个标签的单独字符串数组

但是，这里我添加了完成代码解析部分的代码

{

                    for data in dataArray! {

                        let anObject = SomeObject()

                        let name = data["name"] as? String
                        if name != nil {
                            anObject.name = name!
                            print("anObject.name \(name!)")
                        }

                        let heroImage = data["heroImage"] as? String
                        if heroImage != nil {
                            anObject.imageURLString = heroImage!
                            print("anObject.imageURLString \(heroImage!)")
                        }

                        let address = data["address"] as? String
                        if address != nil {
                            anObject.address = address!
                            print("anObject.address \(address!)")
                        }

                        let area = data["area"] as? String
                        if area != nil {
                            anObject.area = area!
                            print("anObject.area \(area!)")
                        }

                        let city = data["city"] as? String
                        if city != nil {
                            anObject.city = city!
                            print("anObject.city \(city!)")
                        }

                        let contactNumber = data["contactNumber"] as? String
                        if contactNumber != nil {
                            anObject.contactNumber = contactNumber!
                            print("anObject.contactNumber \(contactNumber!)")
                        }

                        let createdAt = data["createdAt"] as? String
                        if createdAt != nil {
                            anObject.createdAt = createdAt!
                            print("anObject.createdAt \(createdAt!)")
                        }

                        let distanceFromUser = data["distanceFromUser"] as? Double
                        if distanceFromUser != nil {
                            anObject.distanceFromUser = distanceFromUser!
                            print("anObject.distanceFromUser \(distanceFromUser!)")
                        }

                        let id = data["id"] as? String
                        if id != nil {
                            anObject.id = id!
                            print("anObject.id \(id!)")
                        }

                        let isDiscounted = data["isDiscounted"] as? Int
                        if isDiscounted != nil {
                            if isDiscounted! == 0 {
                                anObject.isDiscounted = false
                            }
                            else if isDiscounted == 1 {
                                anObject.isDiscounted = true
                            }
                            print("anObject.isDiscounted \(anObject.isDiscounted)")
                        }

                        let isFavorite = data["isFavorite"] as? Int
                        if isFavorite != nil {
                            if isFavorite! == 0 {
                                anObject.isFavorite = false
                            }
                            else if isFavorite == 1 {
                                anObject.isFavorite = true
                            }
                            print("anObject.isFavorite \(anObject.isFavorite)")
                        }


                        let latitude = data["latitude"] as? Double
                        if latitude != nil {
                            anObject.latitude = latitude!
                            print("anObject.latitude \(latitude!)")
                        }

                        let longitude = data["longitude"] as? Double
                        if longitude != nil {
                            anObject.longitude = longitude!
                            print("anObject.longitude \(longitude!)")
                        }

                        let merchantId = data["merchantId"] as? String
                        if merchantId != nil {
                            anObject.merchantId = merchantId!
                            print("anObject.merchantId \(merchantId!)")
                        }

                        let logo = data["logo"] as? String
                        if logo != nil {
                            anObject.logo = logo!
                            print("anObject.logo \(logo!)")
                        }

                        let awardedLoyalty = data["awardedLoyalty"] as? Int
                        if awardedLoyalty != nil {
                            anObject.awardedLoyalty = awardedLoyalty!
                            print(" anObject.awardedLoyalty \(awardedLoyalty!)")
                        }

                        let cashbackPercentage = data["cashbackPercentage"] as? Double
                        if cashbackPercentage != nil {
                            anObject.cashbackPercentage = cashbackPercentage!
                            print("anObject.cashbackPercentage \(cashbackPercentage!)")
                        }

                        let offers = data["offers"] as? [[String:AnyObject]]
                        if offers != nil {

                            var offersArray: [Offer] = []

                            for anOffer in offers! {
                                // note that offers is an array of offers, each item in the array is a dictionary, so you better create a new object Offer, with properties that represent each key in each dictionary in offers array
                                let offer = Offer()


                                let amount = anOffer["amount"] as? Double
                                if amount != nil {
                                    offer.amount = amount!
                                    print("offer.amount \(amount!)")
                                }

                                let approvedBy = anOffer["approvedBy"] as? String
                                if approvedBy != nil {
                                    offer.approvedBy = approvedBy!
                                    print("offer.approvedBy \(approvedBy!)")
                                }

                                let audience = anOffer["audience"] as? String
                                if audience != nil {
                                    offer.audience = audience!
                                    print("offer.audience \(audience!)")
                                }

                                let createdAt = anOffer["createdAt"] as? String
                                if createdAt != nil {
                                    offer.createdAt = createdAt!
                                    print("offer.createdAt \(createdAt!)")
                                }

                                let description = anOffer["description"] as? String
                                if description != nil {
                                    offer.description = description!
                                    print("offer.description \(description!)")
                                }

                                let discount = anOffer["discount"] as? Double
                                if discount != nil {
                                    offer.discount = discount!
                                    print("offer.discount \(discount!)")
                                }

                                let finePrint = anOffer["finePrint"] as? String
                                if finePrint != nil {
                                    offer.finePrint = finePrint!
                                    print("offer.finePrint \(finePrint!)")
                                }

                                let hangoutId = anOffer["hangoutId"] as? String
                                if hangoutId != nil {
                                    offer.hangoutId = hangoutId!
                                    print("offer.hangoutId \(hangoutId!)")
                                }

                                let id = anOffer["id"] as? String
                                if id != nil {
                                    offer.id = id!
                                    print("offer.id \(id!)")
                                }

                                let locationId = anOffer["locationId"] as? String
                                if locationId != nil {
                                    offer.locationId = locationId!
                                    print("offer.locationId \(locationId!)")
                                }

                                let maxDiscount = anOffer["maxDiscount"] as? Double
                                if maxDiscount != nil {
                                    offer.maxDiscount = maxDiscount!
                                    print("offer.maxDiscount \(maxDiscount!)")
                                }

                                let offerType = anOffer["offerType"] as? String
                                if offerType != nil {
                                    offer.offerType = offerType!
                                    print("offer.offerType \(offerType!)")
                                }

                                let status = anOffer["status"] as? String
                                if status != nil {
                                    offer.status = status!
                                    print("offer.status \(status!)")
                                }

                                let updatedAt = anOffer["updatedAt"] as? String
                                if updatedAt != nil {
                                    offer.updatedAt = updatedAt!
                                    print("offer.updatedAt \(updatedAt!)")
                                }

                                offersArray.append(offer)
                            }

                            anObject.offers = offersArray
                        }


                        let tags = data["tags"] as? [String]
                        for tag in tags! {
                            //note the tags array of strings, each string is some tags separated by ","
                            //backend developer should make it an array of separate string for each tag
                            let tagsArray = tag.componentsSeparatedByString(",")
                            anObject.tags = tagsArray
                            print("tagsArray \(tagsArray)")
                        }

                        let timings = data["timings"] as? [[String]]
                        if timings != nil {

                            for timingsArray in timings! {
                                var aTimingArray: [String] = []

                                for timing in timingsArray {

                                    aTimingArray.append(timing)
                                    print("timing \(timing)")
                                }
                                anObject.timings = aTimingArray
                            }


                        }


                        let updatedAt = data["updatedAt"] as? String
                        if updatedAt != nil {
                            anObject.updatedAt = updatedAt!
                            print("anObject.updatedAt \(updatedAt!)")
                        }