Make Google Maker like a Toggle Button - ios

Question

Actually i am adding iconview to marker and change to another iconview when one tap on that marker. this can be easily done by adding iconview in didTapMarker delegate method. But How to change to default view when one select to another Marker. just like Toggle Button
- (void)viewDidLoad
{
for(int i=0;i<lat.count;i++)
{
CLLocationCoordinate2D position = CLLocationCoordinate2DMake([[lat objectAtIndex:i]doubleValue],[[longit objectAtIndex:i]doubleValue]);
GMSMarker *marker = [GMSMarker markerWithPosition:position];
UIView *view = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 69, 60)];
UILabel * label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 69, 21)];
label.text = #"Hello";
label.font = [UIFont systemFontOfSize:10];
label.textAlignment = NSTextAlignmentCenter;
label.textColor = [UIColor colorWithRed:24.0/255.0 green:59.0/255.0 blue:91.0/255.0 alpha:1.0];
label.backgroundColor = [UIColor colorWithRed:177.0/255.0 green:177.0/255.0 blue:177.0/255.0 alpha:1.0];
UIButton *btn = [[UIButton alloc]initWithFrame:CGRectMake(0, 21, 69, 38)];
[btn setImage:[UIImage imageNamed:#"map2_"] forState:UIControlStateNormal];
[view addSubview:label];
[view addSubview:btn];
marker.iconView = view;
marker.appearAnimation = kGMSMarkerAnimationPop;
marker.map = _mapView;
}
}
and in didTapMarker delegate method
-(BOOL) mapView:(GMSMapView *) mapView didTapMarker:(GMSMarker *)marker
{
UIView *view = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 69, 60)];
UILabel * label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 69, 21)];
label.text = #"Hello";
label.font = [UIFont systemFontOfSize:10];
label.textAlignment = NSTextAlignmentCenter;
label.textColor = [UIColor whiteColor];
label.backgroundColor = [UIColor colorWithRed:32.0/255.0 green:139.0/255.0 blue:58.0/255.0 alpha:1.0];
UIButton *btn = [[UIButton alloc]initWithFrame:CGRectMake(0, 21, 69, 38)];
[btn setImage:[UIImage imageNamed:#"map3_"] forState:UIControlStateNormal];
[view addSubview:label];
[view addSubview:btn];
marker.iconView = view;
return YES;
}

Answer 1

You can userData property of GMSMarker for that, first set the userData with all your marker, so add this line inside your for loop of viewDidLoad where you are adding marker on Map.
marker.userData = #{#"isSelected":[NSNumber numberWithInt:0]};
Now on didTapMarker check like this
-(BOOL) mapView:(GMSMapView *) mapView didTapMarker:(GMSMarker *)marker
{
UIView *view = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 69, 60)];
UILabel * label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 69, 21)];
label.text = #"Hello";
label.font = [UIFont systemFontOfSize:10];
label.textAlignment = NSTextAlignmentCenter;
label.textColor = [UIColor whiteColor];
label.backgroundColor = [UIColor colorWithRed:32.0/255.0 green:139.0/255.0 blue:58.0/255.0 alpha:1.0];
UIButton *btn = [[UIButton alloc]initWithFrame:CGRectMake(0, 21, 69, 38)];
NSNumber *number = [marker.userData objectForKey:#"isSelected"];
if ([number integerValue] == 0) {
[btn setImage:[UIImage imageNamed:#"map3_"] forState:UIControlStateNormal];
marker.userData = #{#"isSelected":[NSNumber numberWithInt:1]};
}
else {
[btn setImage:[UIImage imageNamed:#"map2_"] forState:UIControlStateNormal];
marker.userData = #{#"isSelected":[NSNumber numberWithInt:0]};
}
[view addSubview:label];
[view addSubview:btn];
marker.iconView = view;
return YES;
}