UNUserNotificationCenterDelegate 委托方法 "nearly matches optional requirement"

Question

我正在实施

func userNotificationCenter(_ center: UNUserNotificationCenter, 
    didReceive response: UNNotificationResponse, 
    withCompletionHandler completionHandler: () -> Void) {

但是我收到编译器的 "nearly matches optional requirement" 警告。我的声明有什么问题？我直接从文档中复制了它！

Answer 1

这是 @escaping 属性。它没有显示在文档中。但是它是显示在header。这就是复制的地方！这是正确的声明：

func userNotificationCenter(_ center: UNUserNotificationCenter, 
    didReceive response: UNNotificationResponse, 
    withCompletionHandler completionHandler: @escaping () -> Void) {

UNUserNotificationCenterDelegate 委托方法 "nearly matches optional requirement"

UNUserNotificationCenterDelegate delegate method "nearly matches optional requirement"

ios

swift

usernotifications