ArcGIS當前位置

我在定位服務中遇到問題，它獲取我在哪裏使用ArcGIS的位置。下面是部分代碼：ArcGIS當前位置

-(void)viewDidLoad { 
    [super viewDidLoad]; 
    [self.activityView startAnimating]; 
    //self.mapView.layerDelegate = self; 
    self.mapView.touchDelegate = self; 
    self.mapView.calloutDelegate = self; 
    NSURL *mapUrl = [NSURL URLWithString:kTiledMapServiceURL]; 
    AGSTiledMapServiceLayer *tiledLyr = [AGSTiledMapServiceLayer tiledMapServiceLayerWithURL:mapUrl]; 
    [self.mapView addMapLayer:tiledLyr withName:@"Tiled Layer"]; 

     //Create Bus Graphic layer 
    AGSGraphicsLayer *busGraphicLayer = [AGSGraphicsLayer graphicsLayer]; 
    [self.mapView addMapLayer:busGraphicLayer withName:@"BusLayer"]; 

//Create Graphic layer 
    AGSGraphicsLayer *graphicLayer = [AGSGraphicsLayer graphicsLayer]; 
    [self.mapView addMapLayer:graphicLayer withName:@"GraphicsLayer"]; 

    //Create Service layer 
    AGSGraphicsLayer *serviceLayer = [AGSGraphicsLayer graphicsLayer]; 
    [self.mapView addMapLayer:serviceLayer withName:@"ServiceLayer"]; 

    //Create Path layer 
    AGSGraphicsLayer *pathLayer = [AGSGraphicsLayer graphicsLayer]; 
    [self.mapView addMapLayer:pathLayer withName:@"PathLayer"]; 
} 

- (void) showMarkingOnMap:(Service *) ser 
{ 
    id<AGSLayerView> graphicsLayerView = [self.mapView.mapLayerViews objectForKey:@"ServiceLayer"]; 
    AGSGraphicsLayer *graphicsLayer = (AGSGraphicsLayer*)graphicsLayerView.agsLayer; 
    [graphicsLayer removeAllGraphics]; 

    // Create a symbols png graphic 
    AGSPictureMarkerSymbol *genSymbol = [AGSPictureMarkerSymbol pictureMarkerSymbolWithImageNamed:@"pushpin.png"]; 
    ServiceInfoTemplate *infoTemplate = [[ServiceInfoTemplate alloc] init]; 
    AGSGraphic *genGraphic; 
    AGSPoint *genPt; 
    NSMutableDictionary *dic= [[NSMutableDictionary alloc] init]; 
    [dic setObject:[ser name] forKey:@"NAME"]; 
    if([ser.location isEqualToString: @"\n"] || (ser.location == nil)){ 
     [dic setObject:@"" forKey:@"DESC"]; 
    } else { 
     [dic setObject:[ser location] forKey:@"DESC"]; 
    } 
    genPt = [AGSPoint pointWithX:[[ser xcoordinate] floatValue] 
           y:[[ser ycoordinate] floatValue] 
       spatialReference:self.mapView.spatialReference]; 

    destinationX = [[ser xcoordinate] floatValue]; 
    destinationY = [[ser ycoordinate] floatValue]; 

    genGraphic = [[AGSGraphic alloc] initWithGeometry:genPt symbol:genSymbol attributes:dic infoTemplateDelegate:infoTemplate]; 
    [graphicsLayer addGraphic:genGraphic]; 

    [graphicsLayer dataChanged]; 

    [self.mapView zoomWithFactor:0.1 atAnchorPoint:CGPointMake(destinationX, destinationY) animated:NO]; 
    [self.mapView centerAtPoint:genPt animated:YES]; 
}

這個方法是我所謂的當前位置

- (IBAction) directionAction:(id)sender{ 
    NSString *format = [NSString stringWithFormat:@"http://www....&routeStops=%f,%f;%f,%f&routemode=DRIVE&avoidERP=0"",   
         self.mapView.gps.currentPoint.x, self.mapView.gps.currentPoint.y, destinationX, destinationY]; 

}

這self.mapView.gps.currentPoint.x返回我一個0，但它應該返回當前x座標我在哪裏。任何人都知道它有什麼問題嗎？

來源

2012-08-03 sihao

你應該嘗試包括一些更相關的代碼。地圖視圖如何設置，它依賴於什麼？有沒有任何初始化方法你沒有調用等？編輯 – Jasarien 2012-08-03 08:21:21

會不夠？ – sihao 2012-08-03 08:37:00

什麼是self.mapView.gps？什麼數據類型是x？您正在嘗試記錄一個對象（使用％@），但座標通常表示爲雙打。 – sosborn 2012-08-03 08:38:06

我從代碼中看不到您啓用了mapView上的gps對象。您需要先將enable property設置爲YES來啓用它。然後在嘗試使用currentPoint之前，等待GPS獲取有效位置（currentPoint！= nil）。您可以在currentPoint屬性上設置關鍵值觀察器，並等待它發生更改的通知，然後檢查它是否有效，然後使用它。

self.mapView.gps.enabled = YES; // enable the GPS 

// add the observer like this: 
[self.mapView.gps addObserver:self forKeyPath:@"currentPoint" options:0 context:nil];

然後添加一個方法來得到通知時，它changess：

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { 
    if ([keyPath isEqualToString:@"currentPoint"]) { 
     AGSPoint *point = self.mapView.gps.currentPoint; 
     if (point==nil) return; 

     // now we have a valid gps location 
    } 
}

希望給你一些想法。

來源

2012-11-29 02:37:06 progrmr

ArcGIS當前位置

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