我在网上搜索过,但没有找到与我的问题相关的答案。希望有人能帮我解决这个问题。提前致谢! 这是一个 Firebase observeEvent 函数。
ref.child("path").observeSingleEvent(of: .value, with: { (snapshot) in
// here I have a for loop
for (_, dict) snapshot.value as! NSDictionary {
// do something...
//
// here I would like to do some UI updating, like a progress bar, or just as simple as update the text in a label
label.text = "an object fetched."
}
// I used to do some UI update here, and it works, like tableview.reloadData(), but this time I would like the UI updating happen in that for loop
}) { (error) in
print(error.localizedDescription)
}
有人可以帮我解决这个问题吗?我试过了
DispatchQueue.main.async {
// UI update here but it doesn't work
}
希望有人能帮助我,非常感谢!
最佳答案
Firebase 事件回调在主/UI 线程上触发。您无需通过调度队列,只需从回调中更新 UI。
关于ios - 如何在 Firebase observeEvent block iOS 中更新 UI,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42909411/