SwiftUI中@ObservedObject报错，API数据合并后视图不更新求助

我尝试用ObservableObject在API调用完成后更新视图，但一直遇到上述错误。原本单API调用功能正常，现在需要将两组API数据合并到同一个变量中，但第二次调用后数据修改无法在界面体现。

现有代码结构 #

基础数据模型 #

struct consWrapper: Codable {
    let results: [ConsumptionData]
}

struct ConsumptionData: Codable, Identifiable {
    let id = UUID()
    let consumption: Float
    let interval_start: String
}

合并数据类与API调用函数 #

class combinedIntervalData: ObservableObject, Identifiable {
    var id: String
    @Published var consumptionVal: Float
    @Published var exportVal: Float
    
    init(id: String, consumptionVal: Float, exportVal: Float) {
        self.id = id
        self.consumptionVal = consumptionVal
        self.exportVal = exportVal
    }
}

var combinedData = [combinedIntervalData]()

func getReadings (completed: @escaping ([combinedIntervalData]) -> ()) {
    // ... 省略API请求逻辑
    
    let consumptionResults = try JSONDecoder().decode(consWrapper.self, from: data)
    consumptionResults.results.forEach { joinedInterval in 
        let intervalDate = combinedIntervalData(id: joinedInterval.interval_start, consumptionVal: joinedInterval.consumption, exportVal: 0)
        combinedData.append(intervalDate)    
    }
    DispatchQueue.main.async { completed(combinedData)}
}

第二组API数据合并逻辑 #

let exportResults = try JSONDecoder().decode(consWrapper.self, from: data)
exportResults.results.forEach { joinedInterval in 
    let savedData = combinedData.filter({$0.id == joinedInterval.interval_start})[0]
    savedData.exportVal = joinedInterval.consumption
}  

视图中的调用方式 #

@ObservedObject var combinedData:[combinedIntervalData] = []

问题详情 #

• 第一次API调用正常，数据能显示在视图上
• 第二次API调用时，控制台能看到正确数据，但修改后的exportVal无法在界面更新
• 尝试改用@State时，代码无语法错误，但应用会在第二组API解码前崩溃
• 使用@ObservedObject时直接报类型不匹配错误

内容的提问来源于stack exchange，提问作者Marc H