如何使用Swift3检测与Firebase数据库的互联网连接？

如果您想检测您的应用是否与Firebase数据库后端有连接,您可以收听/.info/connected.Firebase文档中有关检测连接状态的示例应该可以解决问题:

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");
  }
}];