MKMapRect zooms too much

Question

I use this code to show all my annotations on my map:

 MKMapRect zoomRect = MKMapRectNull;
        for (id  annotation in mapView.annotat         


        

Answer 1

Try this code:

//here comes your for loop...

double minMapHeight = 10; //choose some value that fit your needs
double minMapWidth = 10;  //the same as above
BOOL needChange = NO;

double x = MKMapRectGetMinX(zoomRect);
double y = MKMapRectGetMinY(zoomRect);
double w = MKMapRectGetWidth(zoomRect);
double h = MKMapRectGetHeight(zoomRect);  //here was an error!!

if(MKMapRectGetHeight(zoomRect) < minMapHeight){
    x -= minMapWidth/2;
    w += minMapWidth/2;
    needChange = YES;
}
if(MKMapRectGetWidth(zoomRect) < minMapWidth){
    y -= minMapHeight/2;
    h += minMapHeight/2;
    needChange = YES;
}
if(needChange){
    zoomRect = MKMapRectMake(x, y, w, h);
}
[mapView setVisibleMapRect:zoomRect animated:YES];

EDITED ->

double minMapHeight = 250; //choose some value that fit your needs
double minMapWidth = 250;  //the same as above
BOOL needChange = NO;

double x = MKMapRectGetMinX(zoomRect);
double y = MKMapRectGetMinY(zoomRect);
double w = MKMapRectGetWidth(zoomRect);
double h = MKMapRectGetHeight(zoomRect);
double centerX = MKMapRectGetMidX(zoomRect);
double centerY = MKMapRectGetMidY(zoomRect);

if(MKMapRectGetHeight(zoomRect) < minMapHeight){
    //x -= minMapWidth/2;
    //w += minMapWidth/2;
    x = centerX - w/2;
    needChange = YES;
}
if(MKMapRectGetWidth(zoomRect) < minMapWidth){
    //y -= minMapHeight/2;
    //h += minMapHeight/2;
    y = centerY - h/2;
    needChange = YES;
}
if(needChange){
    zoomRect = MKMapRectMake(x, y, w, h);
}
[mapView setVisibleMapRect:zoomRect animated:YES];