Question

我们在iOS7中遇到了MKMapView区域的问题。

我们的应用程序启动后，设备已多次更改UI方向，map.region返回的值变得非常奇怪。它们倾向于具有合理的经度跨度但是具有小的纬度跨度，或反之亦然，好像该地图的印象是其边界沿着屏幕的一个边缘被切割成窄矩形。在发生这种情况之后，MKMapView的实际边界和框架仍然是合理的。

通过从地图的实际边界计算我们自己的区域，可以解决这个问题，但我们还有一些问题无法解决。例如，当点击注释以显示其标注时，地图有时会平移以将标注移动到它认为占据的屏幕的那一小部分。

还有其他人遇到过这个问题吗？

我们提供了实施变通方法的备忘录，如果它们有用的话：

+(void)setMap: (MKMapView*) map region:(MKCoordinateRegion) region
{


CGRect realBounds = map.bounds;

MKCoordinateRegion claimedRegion = map.region; // the map's claimed region, which is wonkily different after a rotate in ios7

CGRect claimedBounds = [map convertRegion:claimedRegion toRectToView:map]; // the bounds which the map thinks its region occupies


// if we want region to map to realBounds, but the map thinks it is only claimedBounds big, what
// reduced region will map to claimedBounds ?

MKCoordinateRegion reducedRegion = [Utilities sliceRegion: region inBounds: realBounds toReducedBounds: claimedBounds];

[map setRegion:reducedRegion animated:YES];

}

+ (MKCoordinateRegion) sliceRegion: (MKCoordinateRegion) bigRegion inBounds: (CGRect) wholeBounds toReducedBounds: (CGRect) reducedBounds
{
MKCoordinateRegion reducedRegion;


 // Coords of our region's corners in lat/long
CLLocationDegrees left = bigRegion.center.longitude - bigRegion.span.longitudeDelta/2.0;
CLLocationDegrees right = bigRegion.center.longitude + bigRegion.span.longitudeDelta/2.0;
CLLocationDegrees top = bigRegion.center.latitude + bigRegion.span.latitudeDelta/2.0;
CLLocationDegrees bottom = bigRegion.center.latitude - bigRegion.span.latitudeDelta/2.0;


// Coords of our bounds in pixels
CGFloat wholeLeft = wholeBounds.origin.x;
CGFloat wholeRight = wholeBounds.origin.x + wholeBounds.size.width;
CGFloat wholeTop = wholeBounds.origin.y;
CGFloat wholeBottom = wholeBounds.origin.y + wholeBounds.size.height;

// Coords of the smaller bounds in pixels
CGFloat reducedLeft = reducedBounds.origin.x;
CGFloat reducedRight = reducedBounds.origin.x + reducedBounds.size.width;
CGFloat reducedTop = reducedBounds.origin.y;
CGFloat reducedBottom = reducedBounds.origin.y + reducedBounds.size.height;

// Now work out what the lat & long values for the corners of the reduced bounds are
CLLocationDegrees newLeft = left + (right-left) * (reducedLeft - wholeLeft) / (wholeRight - wholeLeft);
CLLocationDegrees newRight = left + (right-left) * (reducedRight - wholeLeft) / (wholeRight - wholeLeft);
CLLocationDegrees newTop = top + (bottom - top) * (reducedTop - wholeTop) / (wholeBottom - wholeTop);
CLLocationDegrees newBottom = top + (bottom - top) * (reducedBottom - wholeTop) / (wholeBottom - wholeTop);

reducedRegion.center.longitude = (newRight + newLeft) / 2.0;
reducedRegion.center.latitude = (newBottom + newTop) / 2.0;

reducedRegion.span.longitudeDelta = newRight - newLeft;
reducedRegion.span.latitudeDelta = newTop - newBottom;


return reducedRegion;
}


+(MKCoordinateRegion)getMapRegion: (MKMapView*) map
{


CGRect bounds = map.bounds;

MKCoordinateRegion region = [map convertRect:bounds toRegionFromView:map]; // the region we can see on the screen, not the map's wonky region!

if ((region.span.latitudeDelta < 0.0) || (region.span.longitudeDelta < 0.0) ||  region.span.longitudeDelta / region.span.latitudeDelta > 5.0 || region.span.latitudeDelta / region.span.longitudeDelta > 5.0 )
{
    LogD(@"getMap: region: bad span -  lat: %f, long: %f", region.span.latitudeDelta, region.span.longitudeDelta);
}

return region;
}

+(void)setMap: (MKMapView*) map center: (CLLocationCoordinate2D) center
{


CGRect bounds = map.bounds;

MKCoordinateRegion boundsRegion = [map convertRect:bounds toRegionFromView:map]; // the region we can see on the screen

MKCoordinateRegion claimedRegion = map.region; // the map's claimed region, which is wonkily different after a rotate in ios7

CLLocationCoordinate2D offsetCenter; // make up a value to tell the map to center on which will make it really center

offsetCenter.latitude = center.latitude - ( boundsRegion.center.latitude - claimedRegion.center.latitude );
offsetCenter.longitude = center.longitude - ( boundsRegion.center.longitude - claimedRegion.center.longitude );

[map setCenterCoordinate:offsetCenter animated:YES];


}


+(CLLocationCoordinate2D)getMapCenter: (MKMapView*) map
{

CGRect bounds = map.bounds;

MKCoordinateRegion boundsRegion = [map convertRect:bounds toRegionFromView:map]; // the region we can see on the screen
return boundsRegion.center;

}

Answer 1

当我在LandscapeRight中设置iOS 7上的地图区域时，一切正常。

当我将设备旋转到LandscapeLeft并加载相同的区域时，地图会大幅度移动并向远处放大。缩放级别需要乘以100才能解决问题，即。 50000变为5000000＆amp;我需要从lat＆amp;中减去23。在lon上添加3即。（41.0,29.0）变为（18.0,32.0）。

经过一些测试后，我能够解决iOS 7＆amp; A等问题。 iOS 6（原谅iOS版本检查它的快速和脏）

if([[[UIDevice currentDevice] systemVersion] rangeOfString:@"7."].location != NSNotFound){
        if(self.interfaceOrientation == UIInterfaceOrientationLandscapeLeft){
            CLLocationCoordinate2D startCoord = CLLocationCoordinate2DMake(41.0, 29.0);
            [_mapView setRegion:MKCoordinateRegionMakeWithDistance(startCoord, 5000000.0, 5000000.0) animated:NO];
        }else if(self.interfaceOrientation == UIInterfaceOrientationLandscapeRight){
            CLLocationCoordinate2D startCoord = CLLocationCoordinate2DMake(18.0, 32.0);
            [_mapView setRegion:MKCoordinateRegionMakeWithDistance(startCoord, 50000.0, 50000.0) animated:NO];
        }

    }else{
        MKCoordinateRegion region;
        region.center.latitude = topLeftCoord.latitude - (topLeftCoord.latitude - bottomRightCoord.latitude) * 0.3;
        region.center.longitude = topLeftCoord.longitude + (bottomRightCoord.longitude - topLeftCoord.longitude) * 0.7;
        region.span.latitudeDelta = fabs(topLeftCoord.latitude - bottomRightCoord.latitude) * span; // Add a little extra space on the sides
        region.span.longitudeDelta = fabs(bottomRightCoord.longitude - topLeftCoord.longitude) * span; // Add a little extra space on the sides

        region = [_mapView regionThatFits:region];
        [_mapView setRegion:region animated:NO];
    }

iOS7中的方向更改后，MKMapView区域会中断

1 个答案: