[英]How to check Observable count in rxswift?
我有這種方法返回用戶可觀察
internal func getUser() -> Observable<User> {
let result = withRealm("getting user") { realm -> Observable<User> in
let realm = try Realm()
let user = realm.objects(User.self).first
return Observable.from(optional: user)
}
return result ?? .empty()
}
現在,我想擁有另一種方法,如果用戶已登錄,該方法將返回我,該怎么辦?
private var _isLoggedIn: Observable<User> {
return getUser().count > 0 //error
}
我建議改用枚舉來擺脫可選項,以便於管理:
enum LoginState {
case loggedIn(user: User)
case loggedOut
}
internal func getLoginState() -> Observable<LoginState> {
let user = withRealm("getting user") { realm -> User? in
let realm = try Realm()
return realm.objects(User.self).first
}
if let user = user {
return Observable.just(.loggedIn(user))
} else {
return Observable.just(.loggedOut)
}
}
private var _isLoggedIn: Observable<Bool> {
return getLoginState().map {
switch $0 {
case .loggedIn: return true
case .loggedOut: return false
}
}
}
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