How get data in Firebase? - ios

Question

I'm newbie with Firebase. I try to get data in Database, but my code is not working. Here is my code:
- (void) getData{
FIRDatabaseReference *ref = [[FIRDatabase database] reference];
//READ DATA
[[[ref child:#"buysell"] child:#"users"] observeEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot * _Nonnull snapshot) {
NSDictionary *dict = snapshot.value;
NSLog(#"%#",dict);
} withCancelBlock:^(NSError * _Nonnull error) {
}];
}
It cant jump in withBlock:^(FIRDataSnapshot * _Nonnull snapshot). What seems to be wrong? Please help me. Thanks.

Answer 1

Move this to viewDidLoad
FIRDatabaseReference *ref = [[FIRDatabase database] reference];
Check whether you configured everything according to the documentation.
Check the key names
If everything is fine then try changing this
Try with observeSingleEventOfType instead of observeEventType
[[[self.ref child:#"buysell"] child:#"users"] observeSingleEventOfType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot * _Nonnull snapshot) {
NSDictionary *dict = snapshot.value;
NSLog(#"%#",dict);
} withCancelBlock:^(NSError * _Nonnull error) {
NSLog(#"%#", error.localizedDescription);
}];
If above 3 not works check your error statement

Answer 2

You can do it easily. If you want to fetch all info using this you can do this. Make sure your db is public
#property (strong, nonatomic) FIRDatabaseReference *ref;
Define Property on interface then
self.ref = [[FIRDatabase database] reference];
[self.ref observeEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot * _Nonnull snapshot) {
NSDictionary *usersDict = snapshot.value;
NSLog(#"Information : %#",usersDict);
}];
If you want to fetch specific portion using this you can do this
[[self.ref child:#"results"] observeEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot * _Nonnull snapshot) {
NSDictionary *usersDict = snapshot.value;
NSLog(#"Info : %#",usersDict);
}];
My Fetched Json From Firebase
{
"results" : [
{
"name":"test 1",
"URL" : "URL STRING"
},
{
"name":"test 1",
"URL" : "URL STRING"
},
{
"name":"test 1",
"URL" : "URL STRING"
},
{
"name":"test 1",
"URL" : "URL STRING"
}
]
}