我正在尝试确定放置 Firebase 性能跟踪的最佳位置。我想看看我的应用程序提取数据需要多长时间。
在我的 VC 中,我有以下内容
func pullAllUsersCards() {
// 1 Start Here?
FirebaseUtility.shared.getCards { (cards, errMessage) in
if let theCards = cards {
if theCards.count < 1 {
if let addVC = self.storyboard?.instantiateViewController(withIdentifier: StoryboardKeys.addCardViewControllerStoryboardID) as? AddCardViewController {
let addNavigation = UINavigationController(rootViewController: addVC)
if UIDevice.current.userInterfaceIdiom == .pad {
self.splitViewController?.present(addNavigation, animated: true, completion: nil)
} else {
self.present(addNavigation, animated: true, completion: nil)
}
}
} else {
// 2 Start Here?
MBProgressHUD.showAdded(to: self.view, animated: true)
self.cardArray = theCards
self.tableView.reloadData()
MBProgressHUD.hide(for: self.view, animated: true)
}
}
}
}
最初我想将跟踪放在 getCards 方法所在的单例类 FirebaseUtility 上。
func getCards(completion: @escaping (_ cards: [Card]?, _ errorMessage: String?) -> Void) {
// let testTrace = Performance.startTrace(name: "Test")
guard let userID = user?.uid else {
let error = "Unknown error occured! User is not logged in."
completion(nil, error)
return
}
let userCardRef = ref.child(FirebaseKeys.newCards).child(userID)
userCardRef.observe(.value, with: { (snapshot) in // changed from Single Event
let enumerator = snapshot.children
var cards = [Card]()
while let cardSnapshot = enumerator.nextObject() as? DataSnapshot {
if let cardDict = cardSnapshot.value as? [String : Any] {
let card = Card(id: cardSnapshot.key, cardDict: cardDict)
cards.append(card)
}
}
completion(cards, nil)
})
// testTrace?.stop()
}
但是,当我尝试在那里使用它时,我收到一条错误消息,提示 Firebase Performance 目前不支持扩展