我们在 iOS7 中遇到了 MKMapView 的区域问题。

在我们的应用程序启动并且设备更改了几次 UI 方向后，map.region 返回的值变得非常奇怪。它们往往有一个合理的经度跨度但一个小的纬度跨度，反之亦然，就好像 map 的印象是它的边界已经沿着屏幕的一个边缘被切割成一个狭窄的矩形。发生这种情况后，MKMapView 的实际边界和框架仍然有意义。

通过根据 map 的实际边界计算我们自己的区域，可以解决由此导致的一些问题，但我们仍有一些问题无法解决。例如，当点击注释以显示其标注时， map 有时会平移以将标注移动到它认为它占据的屏幕的一小部分。

有没有其他人遇到过这个问题？

我们的 shim 来实现解决方法如下，以防它们有用:

+(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;

}

最佳答案

当我在 iOS 7 上的 LandscapeRight 中设置 map 区域时，一切正常。

当我将设备旋转到 LandscapeLeft 并加载同一区域时， map 会大量移动并缩放到很远的地方。缩放级别需要乘以 100 才能解决问题，即。 50000 变成 5000000 & 我需要从 lat 中减去 23 & 将 3 添加到 lon 即。 (41.0, 29.0) 变为 (18.0, 32.0)。

经过一些测试后，我能够像这样解决 iOS 7 和 iOS 6 的问题(请原谅 iOS 版本检查它的快速和肮脏)

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];
    }

关于ios - MKMapView 区域在 iOS7 中的方向更改后变得 splinter ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19009341/