Swift 错误：表达式类型不明确，没有更多上下文

Question

Im trying to make a Zomato clone in SwiftUI. The error occurs when I try to loop through an item in the Firebase Firestore DB. The error occurs in this code:

let product = Product(name: productName, price: productPrice)

Here's the entire code: https://github.com/MysteryCoder456/VegieMato/blob/backend/VegieMato/TabViews/HomeView.swift#L57

Answer 1

Your productObjects is declared as a let constant and needs to be a var if you want to append items to it.

let productObjects: Array<Product> = [] // <--- Change to a var
    for prod in vendorProducts {
        let productName = prod["name"]
        let productPrice = prod["price"]
        let product = Product(name: productName, price: productPrice)
        productObjects.append(product)
}

Answer 2

Your productName and productPrice values would be interpreted as Any data type since the prod value has been defined as [String:Any]. So it has to properly casted before creating Product instance.

if let productName = prod[“name”] as? String, 
   let productPrice = prod[“price”] as? Int {
   let product = Product(name: productName, price: productPrice)
   productObjects.append(product) 
}