如何将表达式分解为不同的子表达式?

How to break up expression into distinct sub-expressions?

我在 Swift 中遇到了这个错误 “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”

这是抛出错误的代码。

             let obj = self.AddressList[indexPath.row] as! Address
//            let a:String! = obj.street+" ,"+obj.city+" "+obj.country
//            let b:String! = obj.country
            StaticData.singleton.cardAddress = obj.street+" ,"+obj.city+" "+obj.country
            StaticData.singleton.AddressID = obj.id
            StaticData.singleton.cart_addresstotal = obj.total_amount
            StaticData.singleton.cart_addressFee = obj.delivery_fee
            DispatchQueue.main.async {
                self.dismiss(animated:true, completion:nil)
            }

特别是这部分代码错误指向:

    StaticData.singleton.cardAddress = obj.street+" ,"+obj.city+" "+obj.country

只需将 + 运算符替换为字符串连接即可。通常,使用字符串连接是优于使用 + 运算符的首选方法。

StaticData.singleton.cardAddress = "\(obj.street) ,\(obj.city) \(obj.country)"