iOS Development Learning Mapkit-get an area that displays multiple markers in Mapview (map) (mkcoordinateregion)

-(Mkcoordinateregion) Regionforannotations: (Nsarray *) annotations//Can be copied using intact

{

Mkcoordinateregion region;

if ([annotations count] = = 0)

{

Region = Mkcoordinateregionmakewithdistance (self.mapView.userLocation.coordinate, 1000, 1000);

}

else if ([annotations count] = = 1)

{

ID <MKAnnotation> annotation = [annotations Lastobject];

Region = Mkcoordinateregionmakewithdistance (annotation.coordinate, 1000, 1000);

}

Else

{

Cllocationcoordinate2d Topleftcoord;

Topleftcoord.latitude =-90;

Topleftcoord.longitude = 180;

Cllocationcoordinate2d Bottomrightcoord;

Bottomrightcoord.latitude = 90;

Bottomrightcoord.longitude =-180;

For (id <MKAnnotation> annotation in annotations)

{

Topleftcoord.latitude = Fmax (Topleftcoord.latitude, annotation.coordinate.latitude);

Topleftcoord.longitude = Fmin (Topleftcoord.longitude, annotation.coordinate.longitude);

Bottomrightcoord.latitude = Fmin (Bottomrightcoord.latitude, annotation.coordinate.latitude);

Bottomrightcoord.longitude = Fmax (Bottomrightcoord.longitude, annotation.coordinate.longitude);

}

Const double EXTRASPACE = 1.1;

Region.center.latitude = Topleftcoord.latitude-(topleftcoord.latitude-bottomrightcoord.latitude)/2.0;

Region.center.longitude = Topleftcoord.longitude-(topleftcoord.longitude-bottomrightcoord.longitude)/2.0;

Region.span.latitudeDelta = Fabs (topleftcoord.latitude-bottomrightcoord.latitude) * EXTRASPACE;

Region.span.longitudeDelta = Fabs (topleftcoord.longitude-bottomrightcoord.longitude) * EXTRASPACE;

}

return [Self.mapview regionthatfits:region];

}

Instructions for use:

-(Ibaction) showlocations

{

Mkcoordinateregion region = [self regionforannotations:_locations];

Call the above method to get a mkcoordinateregion area that contains multiple tags in the _locations

[Self.mapview setregion:region Animated:yes];

}

Note: Objects in the _locations must implement protocol mkannotation and implement the following three methods:

-(cllocationcoordinate2d) coordinate

{

Return Cllocationcoordinate2dmake ([Self.latitude doublevalue], [Self.longitude doublevalue]);

}

-(NSString *) title

{

if ([self.locationdescription length] > 0)

{

return self.locationdescription;

}

Else

{

return @ "(No Description)";

}

}

-(NSString *) subtitle

{

return self.category;

}

iOS Development Learning Mapkit-get an area that displays multiple markers in Mapview (map) (mkcoordinateregion)