how to catch fail load service

Question

how do i catch exceptions for when the service fails to load. my app throws an nsexception if my url is wrong when it tried to load, but it doesnt catch the exception. I am using try and catch blocks.

RickJones · Accepted Answer

Have you tried this?
- (void)mapView:(AGSMapView *)mapView failedLoadingLayerForLayerView:(UIView<AGSLayerView> *)layerView baseLayer:(BOOL)baseLayer withError:(NSError *)error {     NSLog(@Error loading layer); }