我目前正在做一个聊天信使，我能够检索我发送给其他用户的所有消息，但无法检索他们发送的任何消息。我用来加载消息的代码是
func loadMsg() {
let toId = user!.id!
let fromId = Auth.auth().currentUser!.uid
let ref = Database.database().reference().child("privateMessages").child(fromId).child(toId)
ref.observe(.value) { (snapshot) in
if let snapshot = snapshot.children.allObjects as? [DataSnapshot] {
self.messages.removeAll()
for data in snapshot {
let newMsg = Message(dictionary: data.value as! [String: AnyObject])
self.messages.append(newMsg)
}
}
DispatchQueue.main.async {self.tableView.reloadData()}
}
}
as for my firebase database, it looks like 
和 json 文件
{
"privateMessages" : {
"0YfqnPIOYFYKb8cYZMHnSYti62i2" : {
"StHPXFvTlVf5QDvWiuCi4JF8Hyr2" : {
"-LB0AZRcWF0Ub5ZECzTf" : {
"fromId" : "0YfqnPIOYFYKb8cYZMHnSYti62i2",
"textMessages" : "Hi!first msg!",
"timestamp" : 1524733200,
"toId" : "StHPXFvTlVf5QDvWiuCi4JF8Hyr2"
}
},
"kj7vcszbSvPBTVaC32Xg18aYZPi1" : {
"-LB0EpR86dZSYl5p0k-E" : {
"fromId" : "0YfqnPIOYFYKb8cYZMHnSYti62i2",
"textMessages" : "Different guy,message 2",
"timestamp" : 1524734318,
"toId" : "kj7vcszbSvPBTVaC32Xg18aYZPi1"
}
}
},
"2wYq9dCKF4aZ26nOY41ApPOdGrJ2" : {
"0YfqnPIOYFYKb8cYZMHnSYti62i2" : {
"-LBV5jlvtxbZZJFQOwes" : {
"fromId" : "2wYq9dCKF4aZ26nOY41ApPOdGrJ2",
"textMessages" : "hi",
"timestamp" : 1525252029,
"toId" : "0YfqnPIOYFYKb8cYZMHnSYti62i2"
}
},
"StHPXFvTlVf5QDvWiuCi4JF8Hyr2" : {
"-LBVCQ5GaEugMNFMT2c-" : {
"fromId" : "2wYq9dCKF4aZ26nOY41ApPOdGrJ2",
"textMessages" : "hi",
"timestamp" : 1525253780,
"toId" : "StHPXFvTlVf5QDvWiuCi4JF8Hyr2"
}
}
},
"StHPXFvTlVf5QDvWiuCi4JF8Hyr2" : {
"0YfqnPIOYFYKb8cYZMHnSYti62i2" : {
"-LBVGEFG76z6tXtq43k5" : {
"fromId" : "StHPXFvTlVf5QDvWiuCi4JF8Hyr2",
"textMessages" : "Hi",
"timestamp" : 1525254780,
"toId" : "0YfqnPIOYFYKb8cYZMHnSYti62i2"
}
}
}
},
"users" : {
"0YfqnPIOYFYKb8cYZMHnSYti62i2" : {
"email" : "[email protected] /cdn-cgi/l/email-protection",
"id" : "0YfqnPIOYFYKb8cYZMHnSYti62i2",
"name" : "tester",
"profileImageUrl" : "https://firebasestorage.googleapis.com/v0/b/groupchatnappointment.appspot.com/o/profile_images%2FE509EFCB-E41D-4E6C-922B-01B146FD1FDC.png?alt=media&token=a7acb904-474b-4898-b99a-1e819ec96afc"
},
"StHPXFvTlVf5QDvWiuCi4JF8Hyr2" : {
"email" : "[email protected] /cdn-cgi/l/email-protection",
"id" : "StHPXFvTlVf5QDvWiuCi4JF8Hyr2",
"name" : "tester2",
"profileImageUrl" : "https://firebasestorage.googleapis.com/v0/b/groupchatnappointment.appspot.com/o/profile_images%2F2A5009D7-51C4-4D95-88DF-DADB38C76E7B.png?alt=media&token=ae599135-8ff7-4c64-9667-b9a5cec3dcf8"
},
"kj7vcszbSvPBTVaC32Xg18aYZPi1" : {
"email" : "[email protected] /cdn-cgi/l/email-protection",
"id" : "kj7vcszbSvPBTVaC32Xg18aYZPi1",
"name" : "tester3",
"profileImageUrl" : "https://firebasestorage.googleapis.com/v0/b/groupchatnappointment.appspot.com/o/profile_images%2FD60F2433-14E2-4EE1-AA74-8171CBA1D3AD.png?alt=media&token=728f6171-e48d-4bae-9b84-007937ed3493"
}
}
}
我的 tableviewCells 有一个配置功能
func configCell(message: Message) {
self.message = message
if message.fromId == currentUser {
sentView.isHidden = false
sentMsgLabel.text = message.textMessages
receivedMsgLabel.text = ""
receivedMsgLabel.isHidden = true
} else {
sentView.isHidden = true
sentMsgLabel.text = ""
receivedMsgLabel.text = message.textMessages
receivedMsgLabel.isHidden = false
}
}
我应该如何尝试才能在聊天日志中显示收件人发送给我的内容以及我发送给他们的内容？
实际上你的节点在这里是错误的.child(fromId).child(toId)这样你就只能获取一侧消息。
let chatRoomId = (fromId < toId) ? fromId + "_" + toId : toId + "_" + formId
/// It will look like "0YfqnPIOYFYKb8cYZMHnSYti62i2_kj7vcszbSvPBTVaC32Xg18aYZPi1"
然后将所有消息存储在这里，并在需要时获取chatRoomId以同样的方式。这样您就可以轻松获取这两个用户的所有聊天记录。我也曾回答过paging。所以看看Firebase 分页 https://stackoverflow.com/a/38991762/1140335并以块的形式加载消息。这将会带来更好的用户体验。