我希望在班上有类似的东西:
std::string q = p + "World";
这是否可行,尤其是在结构中调用父类的函数?或者如果没有,这有什么解决方法吗?感谢。
答案 0 :(得分:0)
您可以执行以下操作:
class ExampleViewController: UIViewController {
typealias MyDataSource = (customerList: [Customer]?, supplierList: [Supplier]?, inventoryList: [Inventory]?)
var dataSource: MyDataSource? {
didSet {
reloadDisplay()
}
}
func reloadDisplay() {
// do UI related things here
print("reload")
}
}
以下两个语句都会导致重新加载:
exampleVC.dataSource = (customerList: [Customer](), supplierList: [Supplier](), inventoryList: [Inventory]())
exampleVC.dataSource?.customerList = []()
另一种选择如下:
struct DataSource {
var customerList: [Customer]?
var supplierList: [Supplier]?
var inventoryList: [Inventory]?
init(customerList: [Customer]? = nil, supplierList: [Supplier]? = nil, inventoryList: [Inventory]? = nil) {}
}
class ExampleViewController : UIViewController {
var dataSource: DataSource? {
didSet {
reloadDisplay()
}
}
func reloadDisplay() {
// do UI related things here
}
}