ios – 在MapKit中放大并适合所有注释的最佳方式是什么？

概述快速背景我所做的事情. UIMapView加载并显示单个注释(从不多于一个).在菜单栏上有一个“定位我”按钮,点击“用户位置”即可找到并显示为第二个注释.然后,我将MapView缩小以适应范围内的这些注释,但我无法找到合适的方法.取决于第一个注释与用户位置相关的位置,有时它不会缩小. 例如,如果注释是用户的西北部,则会缩小.但是,如果注释是用户的东南部,它只会缩小到足以让他们被切断,你必须手动缩小 快速背景我所做的事情. UIMapVIEw加载并显示单个注释(从不多于一个).在菜单栏上有一个“定位我”按钮,点击“用户位置”即可找到并显示为第二个注释.然后,我将MapVIEw缩小以适应范围内的这些注释,但我无法找到合适的方法.取决于第一个注释与用户位置相关的位置,有时它不会缩小.

例如,如果注释是用户的西北部,则会缩小.但是,如果注释是用户的东南部,它只会缩小到足以让他们被切断,你必须手动缩小一点.这是我使用的代码,其他一些我在SO上发现的变体.

CLLocation *wheReiam = mapVIEw.userLocation.location;        float lat = wheReiam.coordinate.latitude;        float lon = wheReiam.coordinate.longitude;        CLLocationCoordinate2D southWest = {[currentLatitude floatValue],[currentLongitude floatValue]};        CLLocationCoordinate2D northEast = southWest;        southWest.latitude = MIN(southWest.latitude,lat);        southWest.longitude = MIN(southWest.longitude,lon);        northEast.latitude = MAX(northEast.latitude,lat);        northEast.longitude = MAX(northEast.longitude,lon);        CLLocation *locSouthWest = [[CLLocation alloc] initWithLatitude:southWest.latitude longitude:southWest.longitude];        CLLocation *locnorthEast = [[CLLocation alloc] initWithLatitude:northEast.latitude longitude:northEast.longitude];        CLLocationdistance meters = [locSouthWest distanceFromLocation:locnorthEast];        MKCoordinateRegion region;        region.center.latitude = (southWest.latitude + northEast.latitude) / 2.0;        region.center.longitude = (southWest.longitude + northEast.longitude) / 2.0;        region.span.latitudeDelta = meters / 111319.5        region.span.longitudeDelta = 7.0;        MKCoordinateRegion savedRegion = [mapVIEw regionThatFits:region];        [mapVIEw setRegion:savedRegion animated:YES];        [locSouthWest release];        [locnorthEast release];

有没有更好的方法内置MapKit只是缩小,以便两个注释,让他们说在他们之间的半帧在外框？我真的不在乎用户是否必须放大,我只是想要正确缩小.

解决方法

-(voID)zoomToFitMapAnnotations:(MKMapVIEw*)mapVIEw{    if([mapVIEw.annotations count] == 0)        return;    CLLocationCoordinate2D topleftCoord;    topleftCoord.latitude = -90;    topleftCoord.longitude = 180;    CLLocationCoordinate2D bottomrightCoord;    bottomrightCoord.latitude = 90;    bottomrightCoord.longitude = -180;    for(MapAnnotation* annotation in mapVIEw.annotations)    {        topleftCoord.longitude = fmin(topleftCoord.longitude,annotation.coordinate.longitude);        topleftCoord.latitude = fmax(topleftCoord.latitude,annotation.coordinate.latitude);        bottomrightCoord.longitude = fmax(bottomrightCoord.longitude,annotation.coordinate.longitude);        bottomrightCoord.latitude = fmin(bottomrightCoord.latitude,annotation.coordinate.latitude);    }    MKCoordinateRegion region;    region.center.latitude = topleftCoord.latitude - (topleftCoord.latitude - bottomrightCoord.latitude) * 0.5;    region.center.longitude = topleftCoord.longitude + (bottomrightCoord.longitude - topleftCoord.longitude) * 0.5;    region.span.latitudeDelta = fabs(topleftCoord.latitude - bottomrightCoord.latitude) * 1.1; // Add a little extra space on the sIDes    region.span.longitudeDelta = fabs(bottomrightCoord.longitude - topleftCoord.longitude) * 1.1; // Add a little extra space on the sIDes    region = [mapVIEw regionThatFits:region];    [mapVIEw setRegion:region animated:YES];}

取自：http://codisllc.com/blog/zoom-mkmapview-to-fit-annotations/

(一直使用它.)

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