更改MKOverlayView的MKOverlay坐标 [英] Change coordinate of MKOverlay for an MKOverlayView

问题描述

我在地图上有一个叠加层，我想更改其坐标.为此，我将调用

I have an overlay on the map, and I would like to change its coordinates. To do this seamlessly I'm going to call the setNeedsDisplayInMapRect: method after the change has been made to the view.

我已经通过更改fillColor进行了测试，效果很好:

I've tested this out by just changing the fillColor and it works fine:

overlayView.fillColor = [[UIColor greenColor] colorWithAlphaComponent:0.3];
[overlayView setNeedsDisplayInMapRect:mapView.visibleMapRect];

但是，我似乎碰到一堵砖墙，试图同时更改覆盖视图的中心坐标(这是一个MKCircleView 和 MKA注释 ，它称为overlay属性> MKOverlayView 也是只读的.

However I've seemingly hit a brick wall trying to also change the center coordinates of my overlay view (which is an MKCircleView with an MKCircle). There is a method in MKAnnotation, which MKCircle conforms to, called setCoordinate: - which seems like what I need. Unfortunately though, the circle property in MKCircleView is readonly. Moreover the overlay property in MKOverlayView is also readonly.

实际上是否存在一种更改覆盖层坐标的方法，而无需移除覆盖视图并添加新视图(这会在屏幕上引起非常明显的闪烁)?

Is there actually a way of changing the coordinates for an overlay, without resort to remove the overlay view and adding a new one (which would cause very noticeable flicker on the screen.) ?

推荐答案

在这里发生了同样的问题，所以我正在创建一组方法并根据需要调用它.

same problem is occurred here , so i'm creating set of method and calling it according to requirement.

-(void)removeAllAnnotationFromMapView{
    if ([[self.tmpMapView annotations] count]) {
        [self.tmpMapView removeAnnotations:[self.tmpMapView annotations]];
    }
}
-(void)removeAllOverlays{
    if ([[self.tmpMapView overlays] count]) {
        [self.tmpMapView removeOverlays:[self.tmpMapView overlays]];
    }
}

-(void)removeOverlayWithTag:(int)tagValue{
    for (MKOverlayView *oView in [self.tmpMapView overlays]) {
        if (oView.tag == tagValue) {
            [self.tmpMapView removeOverlay:oView];
        }
    }
}

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