iOS, How to use GMSCoordinateBounds to show all the markers of the map?

I want to show all the markers that are on my map, after doing some searches I found that it should be done with GMSCoordinateBounds (Google Maps SDK) I've read the official documentation about it, but I have not understand how to use it and implement it in my code.

https://developers.google.com/maps/documentation/ios/reference/interface_g_m_s_camera_update#aa5b05606808272f9054c54af6830df3e

Here is my code

GMSCoordinateBounds *bounds = [[GMSCoordinateBounds alloc] init];   
CLLocationCoordinate2D location;

for (NSDictionary *dictionary in array) {
    location.latitude = [dictionary[@"latitude"] floatValue];
    location.longitude = [dictionary[@"longitude"] floatValue];

    // Creates a marker in the center of the map.
    GMSMarker *marker = [[GMSMarker alloc] init];
    marker.icon = [UIImage imageNamed:(@"marker.png")];
    marker.position = CLLocationCoordinate2DMake(location.latitude, location.longitude);
    bounds = [bounds includingCoordinate:marker.position];
    marker.title = dictionary[@"type"];
    marker.map = mapView_;
}   

[mapView_ animateWithCameraUpdate:[GMSCameraUpdate fitBounds:bounds withPadding:30.0f]];

Any help ?

- (void)focusMapToShowAllMarkers
{

    GMSCoordinateBounds *bounds = [[GMSCoordinateBounds alloc] init];

    for (GMSMarker *marker in <An array of your markers>)
        bounds = [bounds includingCoordinate:marker.position];

    [<yourMap> animateWithCameraUpdate:[GMSCameraUpdate fitBounds:bounds withPadding:30.0f]];


}

UPDATE:

are you sure there is nothing wrong in you array of markers and the coordinates? I've tried this code and is working perfectly. I've put this on the viewDidAppear

NSMutableArray *array = [[NSMutableArray alloc]initWithObjects:[[NSDictionary alloc]initWithObjectsAndKeys:@"44.66",@"latitude",@"21.33",@"longitude", nil],
                         [[NSDictionary alloc]initWithObjectsAndKeys:@"44.66",@"latitude",@"21.453",@"longitude", nil],
                         [[NSDictionary alloc]initWithObjectsAndKeys:@"44.44",@"latitude",@"21.993",@"longitude", nil],
                         [[NSDictionary alloc]initWithObjectsAndKeys:@"44.635",@"latitude",@"21.553",@"longitude", nil],
                         [[NSDictionary alloc]initWithObjectsAndKeys:@"44.3546",@"latitude",@"21.663",@"longitude", nil],
                         [[NSDictionary alloc]initWithObjectsAndKeys:@"44.6643",@"latitude",@"21.212",@"longitude", nil],
                         [[NSDictionary alloc]initWithObjectsAndKeys:@"44.63466",@"latitude",@"21.3523",@"longitude", nil],nil];
GMSCoordinateBounds *bounds = [[GMSCoordinateBounds alloc] init];
CLLocationCoordinate2D location;
for (NSDictionary *dictionary in array)
{
    location.latitude = [dictionary[@"latitude"] floatValue];
    location.longitude = [dictionary[@"longitude"] floatValue];
    // Creates a marker in the center of the map.
    GMSMarker *marker = [[GMSMarker alloc] init];
    marker.icon = [UIImage imageNamed:(@"marker.png")];
    marker.position = CLLocationCoordinate2DMake(location.latitude, location.longitude);
    bounds = [bounds includingCoordinate:marker.position];
    marker.title = dictionary[@"type"];
    marker.map = mapView_;
}
[mapView_ animateWithCameraUpdate:[GMSCameraUpdate fitBounds:bounds withPadding:30.0f]];

This is my result:

Swift 3 - Xcode 8

var bounds = GMSCoordinateBounds()
        for marker in yourArrayOfMarkers
        {
            bounds = bounds.includingCoordinate(marker.position)
        }
        let update = GMSCameraUpdate.fit(bounds, withPadding: 60)
        mapView.animate(with: update)

Clean swift 3 version:

let bounds = markers.reduce(GMSCoordinateBounds()) { 
    $0.includingCoordinate($1.position) 
}

mapView.animate(with: .fit(bounds, withPadding: 30.0))

Swift solution using GMSCoordinateBounds() without path,

var bounds = GMSCoordinateBounds()
for location in locationArray
{
    let latitude = location.valueForKey("latitude")
    let longitude = location.valueForKey("longitude")

    let marker = GMSMarker()
    marker.position = CLLocationCoordinate2D(latitude:latitude, longitude:longitude)
    marker.map = self.mapView
    bounds = bounds.includingCoordinate(marker.position)
}
let update = GMSCameraUpdate.fitBounds(bounds, withPadding: 100)
mapView.animateWithCameraUpdate(update)