SubjectType
Represents an object that is both an observable sequeue as well as an observer
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public protocol SubjectType : ObservableType {
/// The type of the observer that represents this subject.
///
/// Usually this type is type of subject itself, but it doesn't have to be.
associatedtype Observer: ObserverType
@available(*, deprecated, renamed: "Observer")
typealias SubjectObserverType = Observer
/// Returns observer interface for subject.
///
/// - returns: Observer interface for subject.
func asObserver() -> Observer
}
注：文中源码来自RxSwift