Ios 按下按钮时如何添加谷歌地图标记?
是否可以从firebase db中的父节点获取所有子节点 试着这么说: 我想同时得到所有的帖子 它获取视频,但仅获取当前用户的视频。我想同时获取所有用户的视频。 下面是一些代码,可以更好地了解我在做什么:Ios 按下按钮时如何添加谷歌地图标记?,ios,swift,firebase,firebase-realtime-database,Ios,Swift,Firebase,Firebase Realtime Database,是否可以从firebase db中的父节点获取所有子节点 试着这么说: 我想同时得到所有的帖子 它获取视频,但仅获取当前用户的视频。我想同时获取所有用户的视频。 下面是一些代码,可以更好地了解我在做什么: fileprivate func fetchAllPost() { fetchPosts() fetchAllPostsFromUserIds() } fileprivate func fetchAllPostsFromUserIds() { guard let ui
fileprivate func fetchAllPost() {
fetchPosts()
fetchAllPostsFromUserIds()
}
fileprivate func fetchAllPostsFromUserIds() {
guard let uid = FIRAuth.auth()?.currentUser?.uid else { return }
FIRDatabase.database().reference().child("posts").child(uid).observeSingleEvent(of: .value, with: { (snapshot) in
guard let userIdsDictionary = snapshot.value as? [String: Any] else { return }
userIdsDictionary.forEach({ (key, value) in
FIRDatabase.fetchUserWithUid(uid: key, completion: { (user) in
self.fetchPostsWithUser(user: user)
})
})
}) { (err) in
print("failed to fetch following users ids:", err)
}
}
var posts = [Post]()
fileprivate func fetchPosts() {
guard let currentUserID = FIRAuth.auth()?.currentUser?.uid else { return }
FIRDatabase.fetchUserWithUid(uid: currentUserID) { (user) in
self.fetchPostsWithUser(user: user)
}
}
fileprivate func fetchPostsWithUser(user: User) {
let ref = FIRDatabase.database().reference().child("posts/\(user.uid)/")
ref.observeSingleEvent(of: .value, with: { (snapshot) in
self.collectionView?.refreshControl?.endRefreshing()
guard let dictionaries = snapshot.value as? [String: Any] else { return }
dictionaries.forEach({ (key,value) in
guard let dictionary = value as? [String: Any] else { return }
var post = Post(user: user, dictionary: dictionary)
post.id = key
guard let uid = FIRAuth.auth()?.currentUser?.uid else { return }
FIRDatabase.database().reference().child("likes").child(key).child(uid).observe(.value, with: { (snapshot) in
if let value = snapshot.value as? Int, value == 1 {
post.hasLiked = true
} else {
post.hasLiked = false
}
self.posts.append(post)
self.posts.sort(by: { (p1, p2) -> Bool in
return p1.creationDate.compare(p2.creationDate) == .orderedDescending
})
self.collectionView?.reloadData()
}, withCancel: { (err) in
print("Failed to fetch info for post")
})
print(self.posts)
})
}) { (error) in
print("Failed to fetch posts", error)
}
}
我不知道Swift,但您可以获取
FIRDatabase.database().reference().child(“posts”)
然后迭代。是的,这将迭代用户ID。但不是用户ID中的帖子使用子快照中的子项