我正在开发一个应用程序，用户可以向另一个用户发送好友请求，接收请求的用户可以接受或删除它。它按预期工作。但是，当用户单击“接受”按钮时，tableView（显示已接收的请求）的单元格会重复。当我重新加载表视图或重新启动应用程序时，它会显示所需的结果，即只显示待处理的请求。此外，数据按预期存储在firebase数据库中。唯一关心的是最初复制细胞背后的自发性和错误。此外，我如何自定义单元格，以便每当用户单击“接受”或“删除”按钮时，只有该单元格变暗，然后从表格中删除？
编辑：
我尝试过使用viewDidLoad代替viewDidAppear！
接收请求函数的代码：
@IBAction func acceptButton(_ sender: Any) {
// add the user to current user's friend list
ref = Database.database().reference()
let currentUserRef = ref.child("users").child(currentUserID!)
currentUserRef.observeSingleEvent(of: .value, with: { (snapshot) in
if snapshot.hasChild("friends"){
self.ref.child("users").child(self.currentUserID!).child("friends").updateChildValues([self.hiddenIDLabel.text!: "true"])
} else{
self.ref.child("users").child(self.currentUserID!).child("friends").setValue([self.hiddenIDLabel.text!: "true"])
}
print("user successfully added as a friend to current user's list")
})
// remove this request from user's received requests
let currentUserDeleteRef = ref.child("users").child(currentUserID!)
currentUserDeleteRef.observeSingleEvent(of: .value, with: { (snapshot) in
self.ref.child("users").child(self.currentUserID!).child("requests").child(self.hiddenIDLabel.text!).removeValue()
})
// add the current user to the user's friend list
let senderRef = ref.child("users").child(hiddenIDLabel.text!)
senderRef.observeSingleEvent(of: .value, with: { (snapshot) in
if snapshot.hasChild("friends"){
self.ref.child("users").child(self.hiddenIDLabel.text!).child("friends").updateChildValues([self.currentUserID!: "true"])
} else{
self.ref.child("users").child(self.hiddenIDLabel.text!).child("friends").setValue([self.currentUserID!: "true"])
}
print("user successfully added as a friend to sender's list")
})
// remove this request from sender's sent requests
let senderDeleteRef = ref.child("users").child(hiddenIDLabel.text!)
senderDeleteRef.observeSingleEvent(of: .value, with: { (snapshot) in
self.ref.child("users").child(self.hiddenIDLabel.text!).child("requests").child(self.currentUserID!).removeValue()
})
}
最后，细胞代码：
<?php
$data = array(
"johnny bairstow alex hales jonh marush",
"Marcelo nash tim pane alexender",
"chaudary Mian Muhammad Aqeel shaib"
);
$output = [];
foreach($data as $names) {
$first = strtok($names, ' ');
$second = strtok(' ');
$the_rest = strtok(null);
$output[] = $first . ' ' . $second;
$output[] = $the_rest;
}
var_export($output);
