【发布时间】：2019-11-30 15:39:13
【问题描述】：
我在这个问题上遇到了一些困难。由于某种原因，ForEach 循环不允许我使用“天气”对象中的数据。我之前已经这样做了，我可以放置 weather.main.rTemp 并从对象中获取值，但现在我收到一个错误，说这不存在，但是没有任何改变？它在 Xcode 自动填充中建议的唯一选项是 weather.self （这也不起作用或有帮助）
我迷路了，请帮帮我。
我的主要观点：
import SwiftUI
struct MainForecastView: View {
@ObservedObject var networkingManager: NetworkingManager
var body: some View {
VStack {
// Text("Weather Forecast")
// .font(.headline)
// .padding(.bottom, 25.0)
HStack(alignment: .bottom) {
VStack(alignment: .leading) {
Text("Today")
.font(.largeTitle)
.fontWeight(.medium)
Text(self.getDateToday())
.font(.subheadline)
}
Image(systemName: "sun.min.fill")
.font(.system(size: 36))
.foregroundColor(Color.yellow)
.padding()
Spacer()
VStack {
Text("12°")
.font(.system(size:48))
.fontWeight(.medium)
.multilineTextAlignment(.trailing)
Text("Sydney, AU")
.multilineTextAlignment(.trailing)
}
}
.padding()
HStack {
Text("Upcoming Forecast")
.font(.headline)
.multilineTextAlignment(.leading)
.padding(.top)
Spacer()
}.padding(.leading, 10.0)
ScrollView(.horizontal, content: {
HStack(spacing: 5) {
ForEach(networkingManager.weatherList, id: \.dt) { weather in
CardView(forecastTime: "12PM", forecastTemp: self.networkingManager.weatherList[0].main.rTemp)
}.padding(.vertical)
}
})
VStack {
HStack {
Text("Chance of Showers")
.font(.headline)
Spacer()
}.padding(.leading, 10.0)
HStack {
Image(systemName: "cloud.rain.fill")
.font(.system(size: 28))
Text("Low Chance")
.font(.title)
.padding()
}.padding(.leading, 10.0)
}
Spacer()
}
.onAppear(){
self.networkingManager.load()
}
.blur(radius: 0)
.padding()
}
func getDateToday() -> String {
let df = DateFormatter()
df.dateFormat = "MMMM dd"
let dateToday = df.string(from: Date())
return dateToday
}
}
struct MainForecastView_Previews: PreviewProvider {
static var previews: some View {
MainForecastView(networkingManager: NetworkingManager())
}
}
然后到我的网络管理器课程
import Foundation
import SwiftUI
import Combine
class NetworkingManager : ObservableObject {
@Published var inputCity = "Sydney"
@Published var weatherList = [WeatherInfoList]()
var weatherCity = CityInformation(name: "Sydney", country: "AU")
func load() {
let apiKey = "ced81d2f91438e7897c4443c4567c205"
guard let url = URL(string: "https://api.openweathermap.org/data/2.5/forecast?q=\(inputCity)&units=metric&APPID=\(apiKey)") else {
return
}
print("City is: \(inputCity)")
URLSession.shared.dataTask(with: url) { (data, response, err) in
guard let data = data else { return }
let weatherInfo = try! JSONDecoder().decode(WeatherAPIResponse.self, from: data)
DispatchQueue.main.async {
self.weatherCity = weatherInfo.city
self.weatherList = weatherInfo.list
}
}.resume()
}
}
最后是来自 API 的数据模型结构
import Foundation
struct WeatherAPIResponse: Decodable {
var list: [WeatherInfoList]
var city: CityInformation
}
struct CityInformation: Decodable {
var name: String
var country: String
}
struct WeatherInfoList: Decodable {
let formatter = DateFormatter()
var dt: Int
var main: WeatherMain
var dtTxt: String
var date: String {
formatter.dateFormat = "EEE hh:mm a"
let cDate = Date.init(timeIntervalSince1970: TimeInterval(dt))
return formatter.string(from: cDate)
}
enum CodingKeys: String, CodingKey {
case dt
case main
case dtTxt = "dt_txt"
}
}
struct WeatherMain: Decodable {
let temp, tempMin, tempMax: Double
let pressure, seaLevel, grndLevel, humidity: Int
let tempKf: Double
var rTemp: Int {
return Int(temp)
}
var rTempMax: Int {
return Int(tempMax)
}
var rTempMin: Int {
return Int(tempMin)
}
enum CodingKeys: String, CodingKey {
case temp
case tempMin = "temp_min"
case tempMax = "temp_max"
case pressure
case seaLevel = "sea_level"
case grndLevel = "grnd_level"
case humidity
case tempKf = "temp_kf"
}
}
【问题讨论】：
标签： arrays xcode loops foreach swiftui