预计

@propertyWrapper
public struct Projected<T, Value> : AnyProjected where T : RLMObjectBase

@Projected 用于声明Projection协议上应由 Realm 托管的属性。

使用示例:

public class Person: Object {
    @Persisted var firstName = ""
    @Persisted var lastName = ""
    @Persisted var address: Address?
    @Persisted var friends: List<Person>
    @Persisted var reviews: List<String>
}

class PersonProjection: Projection<Person> {
    @Projected(\Person.firstName) var firstName
    @Projected(\Person.lastName.localizedUppercase) var lastNameCaps
    @Projected(\Person.address.city) var homeCity
    @Projected(\Person.friends.projectTo.firstName) var firstFriendsName: ProjectedCollection<String>
}

let people: Results<PersonProjection> = realm.objects(PersonProjection.self)
  • 声明一个延迟初始化为类型默认值的属性。

    声明

    Swift

    public init(_ projectedKeyPath: KeyPath<T, Value>)