MKMapView - 限制地图滚动到方形叠加 [英] MKMapView - Limit map scroll to a square overlay

问题描述

我有一个带有方形叠加的MKMapView，描述如下：

I have a MKMapView with a square overlay described as:

   CLLocationCoordinate2D coordsBg[5]={
    CLLocationCoordinate2DMake(31.750865,35.180882),
    CLLocationCoordinate2DMake(31.740331,35.180882),
    CLLocationCoordinate2DMake(31.740331,35.165452),
    CLLocationCoordinate2DMake(31.750865,35.165452),
    CLLocationCoordinate2DMake(31.750865,35.180882)
};     

MKPolygon *bg=[MKPolygon polygonWithCoordinates:coordsBg count:5];
[map addOverlay:bg];

我希望限制用户滚动到叠加层之外。

I wish to limit the user from scrolling outside of the overlay.

我可以限制MKMapView滚动视图吗？还是有其他方法？

Can I limit the MKMapView scroll view for that? Or there is an other method?

谢谢

Shani

推荐答案

经过几个小时的敲击，我得到了这个对我有用的解决方案。

After Few hours of banging my head, I got to this solution that work great for me.

它混合了up：

这篇文章：设置mkmapview的缩放级别

此链接：限制mkmapview滚动来自@Anna Karenina评论我的问题。

And This link: restrict mkmapview scrolling from @Anna Karenina comment to my question.

这是我的代码：

- (void)mapView:(MKMapView *)mapView regionWillChangeAnimated:(BOOL)animated
{
    lastGoodMapRect = mapView.visibleMapRect;
    lastGoodRegion = mapView.region;
}

- (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated
{

    if (manuallyChangingMapRect) {
        manuallyChangingMapRect=NO;
        return;
    }

    if( [mapView zoomLevel] > 16 )
    {
        [mapView setCenterCoordinate:lastGoodRegion.center zoomLevel:16 animated:YES];
    }

    MKMapRect visibleRect = mapView.visibleMapRect;
    MKMapRect OverlayRect = bg.boundingMapRect;
    MKMapRect intersectionRect = MKMapRectIntersection(visibleRect,OverlayRect);

    //you can change the min and max zoom off course
    if(!MKMapRectEqualToRect(visibleRect,intersectionRect)){
        if( [mapView zoomLevel] < 15){

            [mapView setCenterCoordinate:lastGoodRegion.center zoomLevel:15 animated:YES];
        }else if( [mapView zoomLevel] > 16 )
        {
            [mapView setCenterCoordinate:lastGoodRegion.center zoomLevel:16 animated:YES];
        }else{
            manuallyChangingMapRect=YES;
            [mapView setVisibleMapRect:lastGoodMapRect animated:YES];
        }
    }

}

这篇关于MKMapView - 限制地图滚动到方形叠加的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！