arrays - 索引 4 超出范围 [0 .. 3 ]' ... Terminating app due to uncaught exception ' NSRangeException'

Question

我不确定我哪里做错了。

let recievedJson = json
let results = recievedJson["results"] as! NSArray
let resultsDic = results[0] as! NSDictionary
let address = resultsDic["address_components"] as? NSArray
let zipcodeDic = address?[0] as! NSDictionary
let cityNameDic = address?[1] as! NSDictionary
let countyDic = address?[2] as! NSDictionary
let stateDic = address?[3] as! NSDictionary
let countryDic = address?[4] as! NSDictionary
let zipcode = zipcodeDic["long_name"] as! String
let cityName = cityNameDic["long_name"] as! String
let countyName = countyDic["long_name"] as! String
let stateName = stateDic["long_name"] as! String
let stateShortName = stateDic["short_name"] as! String
let countryName = countryDic["long_name"] as! String
let countryShortName = countryDic["short_name"] as! String

尝试从此 json 响应中检索数据

http://maps.googleapis.com/maps/api/geocode/json?address=23508&sensor=true

这对我有用，对@Danh Answer 的小改动。

let recievedJson: [String: Any] = json as! [String : Any]
        if let results = recievedJson["results"] as? [[String: Any]] {

            if results.count > 0 {
                let resultsDic = results[0]

                if let address = resultsDic["address_components"] as? [[String: Any]] {

                    for dict in address {

                        if let longName = dict["long_name"] as? String,
                            let shortName = dict["short_name"] as? String,
                            let types = dict["types"] as? [String] {

                            if types.contains("postal_code") {

                                print("postal_code: \(longName)")
                            } else if types.contains("locality") {

                                print("city: \(longName)")
                            } else if types.contains("administrative_area_level_2") {

                                print("county: \(longName)")
                            } else if types.contains("administrative_area_level_1") {

                                print("state: \(longName)")
                            } else if types.contains("country") {

                                print("country: \(longName)")
                            }
                        }
                    }
                }
            }
        }

Answer 1

address 数组有 4 个项目(索引从 0 到 3)但是你访问的项目的索引是 4，所以你得到了这个错误。您应该使用 Optional Binding - if let 来解包值并检查下标之前数组的 count。并使用 Swift 类型。代码必须是:

let recievedJson: [String: Any] = json
    if let results = recievedJson["results"] as? [[String: Any]] {

        if results.count > 0 {
            let resultsDic = results[0]

            if let address = resultsDic["address_components"] as? [[String: Any]] {

                // zipcode
                if address.count > 0 {

                    let zipcodeDic = address[0]
                    if let zipcode = zipcodeDic["long_name"] as? String {
                        print("zipcode: \(zipcode)")
                    }
                }

                // cityName
                if address.count > 1 {

                    let cityNameDic = address[1]
                    if let cityName = cityNameDic["long_name"] as? String {
                        print("cityName: \(cityName)")
                    }
                }

                // stateName
                if address.count > 2 {

                    let stateDic = address[2]
                    if let stateName = stateDic["long_name"] as? String {
                        print("stateName: \(stateName)")
                    }
                    if let stateShortName = stateDic["short_name"] as? String {
                        print("stateShortName: \(stateShortName)")
                    }
                }

                // countryDic
                if address.count > 3 {

                    let countryDic = address[3]
                    if let countryName = countryDic["long_name"] as? String {
                        print("countryName: \(countryName)")
                    }
                    if let countryShortName = countryDic["short_name"] as? String {
                        print("countryShortName: \(countryShortName)")
                    }
                }
            }
        }
    }

更新:从 Google Maps API 中提取地址组件

let recievedJson: [String: Any] = json
if let results = recievedJson["results"] as? [[String: Any]] {

    if results.count > 0 {
        let resultsDic = results[0]

        if let address = resultsDic["address_components"] as? [[String: Any]] {

            for dict in address {

                if let longName = dict["long_name"] as? String,
                    let shortName = dict["short_name"] as? String,
                    let types = dict["types"] as? [String] {

                    if types.contains("postal_code") {

                        print("postal_code: \(longName)")
                    } else if types.contains("locality") {

                        print("city: \(longName)")
                    } else if types.contains("administrative_area_level_2") {

                        print("county: \(longName)")
                    } else if types.contains("administrative_area_level_1") {

                        print("state: \(longName)")
                    } else if types.contains("country") {

                        print("country: \(longName)")
                    }
                }
            }
        }
    }
}