Get reusable map pin; specify color of pin.

PinForColor.m

+ (NSString *)reusableIdentifierForPinColor :(MKPinAnnotationColor)paramColor
{
    NSString *result = nil;
    switch (paramColor) {
        case MKPinAnnotationColorRed:
        {
            result = REUSABLE_PIN_RED;
            break;
        }
        case MKPinAnnotationColorGreen:
        {
            result = REUSABLE_PIN_GREEN;
            break;
        }
        case MKPinAnnotationColorPurple:
        {
            result = REUSABLE_PIN_PURPLE;
            break;
        }
    }
    return result;
}