我的理解是,Combine中的CurrentValueSubject发布者很适合按需访问,而不是普通的发布者只发出一次值。因此,我尝试在环境对象中使用一个来存储在HKWorkout中消耗的总能量,以便在SwiftUI视图中完成锻炼后访问它。使用下面的代码,我得到了编译器错误Cannot convert return expression of type 'AnyCancellable' to return type 'Double'
我想将通知中心发布者的结果赋给变量alert。我得到的错误是: Cannot use instance member 'alerts' within property initializer; property initializers run beforeimport Foundationimport Combine
initbackEndService
C.NSURLSession.DataTaskPublisher and conformance (extension in Foundation):__C.NSURLSession.DataTaskPublisher : Combine.Publisher"protocol conformance descriptor for (extension in Foundation):__C.NSURLSession.DataTaskPublisher : Combine.PublisherC.NSURLSessio