MapBox：如何去除一个形状并绘制另一个形状？ [英] MapBox: How to remove a shape and draw another shape?

问题描述

我为形状创建了注释

I created annotation for shape

    _path = [RMAnnotation annotationWithMapView:_mapView
                                         coordinate: _userLocation.coordinate
                                           andTitle:@"Path"];
     [_mapView addAnnotation:_path];

在代表我写了

- (RMMapLayer *)mapView:(RMMapView *)mapView layerForAnnotation:(RMAnnotation *)annotation
{
    if ([annotation.title isEqualToString:@"Path"])
    {
        _lineBetweenTwoBeacon = [[RMShape alloc] initWithView:mapView];
        _lineBetweenTwoBeacon.lineColor = [UIColor redColor];
        _lineBetweenTwoBeacon.lineWidth =  10.0f;
        return _lineBetweenTwoBeacon;
    }
    else
    {
    marker = [[RMMarker alloc] initWithUIImage:[UIImage imageNamed:@"userPin"]];
    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 80, 80)];
    imageView.contentMode = UIViewContentModeScaleAspectFit;
    marker.leftCalloutAccessoryView = imageView;
    return marker;
    }
}

下一步我绘制形状

[_lineBetweenTwoBeacon addQuadCurveToCoordinate:firstBeaconCoord controlCoordinate:secondBeaconCoord];

但是如何从地图中删除所有形状并添加新的形状。
现在的形状是形状，这是不正确的。
如果_lineBetweenTwoBeacon每次重绘都会更好。

But how to remove all shapes from the map and add new shape. Now the shape lay to the shape, it's not correct. Will be better if _lineBetweenTwoBeacon redraw every time.

谢谢你的帮助！

推荐答案

当您手动创建一个 RMShape 时，您需要告诉它在哪里移动，并使用 -moveToCoordinate：和 -addLineToCoordinate：。如果您只是有基本需求，我会建议您尝试 RMPolylineAnnotation ，它为您处理图形。

When you manually create an RMShape, you need to tell it where to move and to draw after creating it with methods like -moveToCoordinate: and -addLineToCoordinate:. If you just have basic needs, I would recommend trying RMPolylineAnnotation, which handles the drawing for you.

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