任何人都可以帮助我使用Swift 3检测与Firebase数据库的互联网连接吗?我正在使用此功能从数据库下载数据。
func loadData(){
Ref=FIRDatabase.database().reference()
Handle = Ref?.child("Posts").queryOrdered(byChild: "Des").queryEqual(toValue: "11").observe(.childAdded ,with: { (snapshot) in
if let post = snapshot.value as? [String : AnyObject] {
let img = Posts()
img.setValuesForKeys(post)
self.myarray.append(img)
self.tableView.reloadData()
}else {
}
})
}
答案 0 :(得分:16)
如果您想检测您的应用是否与Firebase数据库后端有连接,则可以收听/.info/connected
。来自Firebase documentation on detecting connection state的这个例子可以解决这个问题:
let connectedRef = FIRDatabase.database().referenceWithPath(".info/connected")
connectedRef.observeEventType(.Value, withBlock: { snapshot in
if let connected = snapshot.value as? Bool where connected {
print("Connected")
} else {
print("Not connected")
}
})
Swift 3.1
let connectedRef = FIRDatabase.database().reference(withPath: ".info/connected")
connectedRef.observe(.value, with: { snapshot in
if let connected = snapshot.value as? Bool, connected {
print("Connected")
} else {
print("Not connected")
}
})
目标C
FIRDatabaseReference *connectedRef = [[FIRDatabase database] referenceWithPath:@".info/connected"];
[connectedRef observeEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot *snapshot) {
if([snapshot.value boolValue]) {
NSLog(@"connected");
} else {
NSLog(@"not connected");
}
}];