Question

我的MKPolyline有问题。

我已添加此代码，但我看不到任何行。我从带有http请求的网络服务器获取坐标。我将坐标保存为双精度并显示我的注释。

viewcontroller.h中的

@property (nonatomic, retain) MKPolyline *routeLine; 
@property (nonatomic, retain) MKPolylineView *routeLineView;

viewcontroller.m中的

CLLocationCoordinate2D coordinateArray[7];
coordinateArray[0] = CLLocationCoordinate2DMake(theCoordinate0.latitude, theCoordinate0.longitude);
coordinateArray[1] = CLLocationCoordinate2DMake(theCoordinate1.latitude, theCoordinate1.longitude);
coordinateArray[2] = CLLocationCoordinate2DMake(theCoordinate2.latitude, theCoordinate2.longitude);
coordinateArray[3] = CLLocationCoordinate2DMake(theCoordinate3.latitude, theCoordinate3.longitude);
coordinateArray[4] = CLLocationCoordinate2DMake(theCoordinate4.latitude, theCoordinate4.longitude);
coordinateArray[5] = CLLocationCoordinate2DMake(theCoordinate5.latitude, theCoordinate5.longitude);
coordinateArray[6] = CLLocationCoordinate2DMake(theCoordinate6.latitude, theCoordinate6.longitude);

self.routeLine = [MKPolyline polylineWithCoordinates:coordinateArray count:7];
[self.mapView setVisibleMapRect:[self.routeLine boundingMapRect]]; //If you want the route to be visible

[self.mapView addOverlay:self.routeLine];

-(MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id<MKOverlay>)overlay
{
    if(overlay == self.routeLine)
    {
        if(nil == self.routeLineView)
        {
            self.routeLineView = [[[MKPolylineView alloc] initWithPolyline:self.routeLine]autorelease];
            self.routeLineView.fillColor = [UIColor redColor];
            self.routeLineView.strokeColor = [UIColor redColor];
            self.routeLineView.lineWidth = 10;

        }

        return self.routeLineView;
    }

    return nil;
}

Answer 1

您是否确认您的mapview已连接到屏幕上的mapview（Interface Builder中的IBOutlet）？接下来要检查的是你已经设置了委托。通过在viewForOverlay函数中放置断点或调试语句来检查这一点。

P.S。使用该代码，您只能绘制一条线。它依赖于self.routeLine和self.routeLineView，而您只有其中一个。

在MKMapKit上看不到MKpolyline

1 个答案: