mapViewDidLoad方法未加载

目标c的新手，我正在使用ArcGIS作为地图部分。我的方法有问题mapViewDidLoad没有被调用/加载。这是代码的一部分：

.h file

@interface ViewController : UIViewController<AGSMapViewLayerDelegate, AGSMapViewTouchDelegate, AGSMapViewCalloutDelegate>{
AGSMapView *_mapView;
AppDelegate *appDelegate;
...
}

.m file

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self.activityView startAnimating];
    self.mapView.touchDelegate = self;
    self.mapView.calloutDelegate = self;
    appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    CLLocationManager *locationManager = [[CLLocationManager alloc] init];
    ...
}

- (void)mapViewDidLoad:(AGSMapView *)mapView {

    AGSEnvelope *envelope = [[AGSEnvelope alloc]initWithXmin:29757.610204117
                                                    ymin:40055.0379682464
                                                    xmax:29884.6992302249
                                                    ymax:40236.6028660071
                                        spatialReference:self.mapView.spatialReference];
    [self.mapView zoomToEnvelope:envelope animated:YES];

    self.mapView.callout.width = 195.0f;
    self.mapView.callout.accessoryButtonHidden = YES;

    [self.mapView.gps start];
    [self.mapView centerAtPoint:self.mapView.gps.currentPoint animated:YES];   
    NSLog(@"Location : %@", self.mapView.gps.currentPoint);

    [self.activityView stopAnimating];
    self.activityView.hidden = YES;

}

我的代码有什么问题为什么我不加载mapViewDidLoad方法。 提前致谢。

make sure that mapviewdelegate is connected by right click on mapview and then assign delegate..

or add [self.mapview setDelegate:self];

在您的情况下，在将第一层添加到地图后，将调用 AGSMapViewLayerDelegate 上的“AGSMapView”mapViewDidLoad：方法。此时，该组件已完全发挥作用，您可以在以下位置找到对其的引用http://help.arcgis.com/en/arcgismobile/10.0/apis/iphone/reference/interface_a_g_s_map_view.html

使 self.mapview.layerDelegate = self;