swift - Xcode 错误，似乎没有有效的解决方案/修复（编译器无法在合理的时间内对该表达式进行类型检查）

Question

背景：我正在上编程课，同时我试图转学，这样我就可以研究我对媒体的真正热情。对不起我草率的编程/缺乏知识。

我目前的评估是创建一个我几乎完成的可视天气应用程序。我唯一的问题是在第 15 行（我的正文视图所在的位置）创建了一个错误，显示为“编译器无法在合理的时间内对该表达式进行类型检查；尝试将表达式分解为不同的子表达式”

我已经尝试将表达式分解，但所有尝试都产生了随机错误。

我在运行 macOS catalina 10.15.4 的 2017 Macbook air 上运行 Xcode 版本 12.4。

有问题的代码如下，只是由于某些原因出现了一些格式错误（我实际上不确定是什么）

'''

导入 SwiftUI

进口组合

结构内容视图：查看{

@ObservedObject var networkManager = NetworkManager()

var body: some View {
    ZStack{
        //background
        if let icon = networkManager.weather?.current.icon.rawValue{
            Image(icon)
                .resizable()
                .aspectRatio(contentMode: .fill)
        }
        //foreground
        VStack{
            Spacer()
            .frame(height:350)
            
            VStack(spacing:0){
                //current Temperature
                HStack(alignment: .center){
                    if let currentIcon = networkManager.weather?.current.icon {
                        currentIcon.image
                            .font(.system(size: 40))
                            .foregroundColor(.primary)
                    }else {
                        Image(systemName: "arrow.clockwise.icloud")
                            .font(.system(size: 40))
                    }
                    if let currentTemp = networkManager.weather?.current.temperature {
                        Text("\(currentTemp, specifier: "%.1f")˚C")
                           .font(.custom("01 Digit", size: 60))
                    } else {
                      Text("--.-")
                           .font(.custom("01 Digit", size: 60))
                    }
                }.frame(height:60)
                //H/L
                HStack{
                    VStack{
                        Text("HIGH")
                            .font(.custom("01 Digit", size: 15))
                            .foregroundColor(.red)
                        HStack{
                            if let myDailyHigh = networkManager.weather?.week.list.first!.maxTemperature {
                                Text("\(myDailyHigh, specifier: "%.0f")")
                                    .font(.custom("01 Digit", size: 20))
                                    .foregroundColor(.red)
                            } else {
                                Text("--.-˚")
                                    .font(.custom("01 Digit", size: 20))
                            
                            }
                            
                        }
                    }
                    Divider()
                    VStack{
                        Text("LOW")
                            .font(.custom("01 Digit", size: 15))
                            .foregroundColor(.blue)
                        HStack{
                            if let myDailyLow = networkManager.weather?.week.list.first!.minTemperature {
                                Text("\(myDailyLow, specifier: "%.0f")")
                                    .font(.custom("01 Digit", size: 20))
                                    .foregroundColor(.blue)
                            } else {
                                Text("--.-˚")
                                    .font(.custom("01 Digit", size: 20))
                                    
                            }
                            

                            }
                        }
                    
                };.frame(height:40)
                if let summary = networkManager.weather?.week.list.first!.summary {
                    Text(summary)
                        .font(.custom("01 Digit", size: 20))
                        .padding()
                } else {
                    Text("Downloading weather data - please be patient, this is a slowass.")
                        .font(.custom("01 Digit", size: 20))
                        .padding()
                }
            }
            
            Spacer()
            
            //random
            VStack{
                HStack{
                    VStack{
                        Text("HUMIDITY")
                            .font(.custom("01 Digit", size: 12))
                        if let humidity = networkManager.weather?.week.list.first!.humidity {
                            Text("\(humidity*100, specifier: "%.0f")%")
                                .font(.custom("01 Digit", size: 20))
                        } else {
                            Text("--%")
                                .font(.custom("01 Digit", size: 20))
                        }
                    }
                    Divider()
                    VStack{
                        Text("DEW POINT")
                            .font(.custom("01 Digit", size: 12))
                        if let dewPoint = networkManager.weather?.week.list.first!.dewPoint {
                            Text("\(dewPoint, specifier: "%.0f")˚C")
                                .font(.custom("01 Digit", size: 20))
                        } else {
                            Text("--˚")
                                .font(.custom("01 Digit", size: 20))
                        }
                    }
                    Divider()
                    VStack{
                        Text("PRESSURE")
                            .font(.custom("01 Digit", size: 12))
                        if let pressure = networkManager.weather?.week.list.first!.pressure{
                            Text("\(pressure, specifier: "%.1f") hPa")
                                .font(.custom("01 Digit", size: 17.5))
                        } else {
                            Text("--.- hPa")
                                .font(.custom("01 Digit", size: 17.5))
                        }
                    }
                    Divider()
                    VStack{
                        Text("WIND SPEED")
                            .font(.custom("01 Digit", size: 12))
                        if let windSpeed = networkManager.weather?.week.list.first!.windSpeed {
                            Text("\(windSpeed, specifier: "%.1f") Km/h")
                                .font(.custom("01 Digit", size: 17.5))
                        } else {
                            Text("-.- Km/h")
                                .font(.custom("01 Digit", size: 17.5))
                        }
                    }
                    Divider()
                    VStack{
                        Text("RAIN")
                            .font(.custom("01 Digit", size: 12))
                        if let rain = networkManager.weather?.week.list.first!.precipProbability {
                            Text("\(rain, specifier: "%.0f")%")
                                .font(.custom("01 Digit", size: 20))
                        } else {
                            Text("--%")
                                .font(.custom("01 Digit", size: 20))
                        }
                        
                    }
                }
                .padding(.init(top: 10.0, leading: 10.0, bottom: 10.0, trailing: 10.0))
                .background(Color(.white).opacity(0.1))
                .cornerRadius(10)
                .overlay(
                    RoundedRectangle(cornerRadius: 10)
                        .stroke(Color.secondary, lineWidth: 1)
                )
                Divider()
                //Weekly view at bot
                HStack{
                    ForEach (1..<8) {index in
                        VStack{
                            //
                            if let currentIcon = networkManager.weather?.week.list[index].icon {
                                currentIcon.image
                            }else {
                                Image(systemName: "arrow.clockwise.icloud")
                            }
                            //

                            Text("\(weekday(from: Date(), index:index))")
                                .font(.custom("01 Digit", size: 10))
                            HStack{
                                if let currentMax = networkManager.weather?.week.list[index].maxTemperature {
                                    Text("\(currentMax, specifier:"%.0f")˚")
                                        .font(.custom("01 Digit", size: 14))
                                        .foregroundColor(.red)
                                } else {
                                    Text("--˚")
                                        .font(.custom("01 Digit", size: 14))
                                }
                                if let currentMin = networkManager.weather?.week.list[index].minTemperature {
                                    Text("\(currentMin, specifier:"%.0f")˚")
                                        .font(.custom("01 Digit", size: 14))
                                        .foregroundColor(.blue)
                                } else {
                                    Text("--˚")
                                        .font(.custom("01 Digit", size: 14))
                                }
                                
                            }
                        }.frame(width:50)
                        .padding(.init(top: 10.0, leading: 1, bottom: 10.0, trailing: 1.0))
                        .background(Color(.white).opacity(0.1))
                        .cornerRadius(10)
                        .overlay(
                            RoundedRectangle(cornerRadius: 10)
                                .stroke(Color.secondary, lineWidth: 1)
                        )
                    }
                }
                
                Spacer()
                    .frame(height:120)
            }
            Spacer()
                .frame(hight:100)
            Image("DarkSky")
                .resizable()
                .aspectRatio(contentMode: .fit)
                .frame(height:120)
    }
}

} } '''

标签： swiftxcode