Customize Maps on iOS

ColorBlendTileOverlayRenderer.m

#import "ColorBlendTileOverlayRenderer.h"
#import "Colors.h"

@implementation ColorBlendTileOverlayRenderer

-(void)drawMapRect:(MKMapRect)mapRect zoomScale:(MKZoomScale)zoomScale inContext:(CGContextRef)context {
    
    [super drawMapRect:mapRect zoomScale:zoomScale inContext:context];
    
    CGRect rect = [self rectForMapRect:mapRect];
    
    CGContextSetBlendMode(context,kCGBlendModeColor);
    CGContextSetFillColorWithColor(context, [CGColor blackColor].CGColor);
    CGContextFillRect(context, rect);
    
    CGContextSetBlendMode(context,kCGBlendModeSoftLight);
    CGContextSetFillColorWithColor(context, [CGColor brownColor].CGColor);
    CGContextFillRect(context, rect);
}

@end

CustomMapView.h

#import <MapKit/MapKit.h>

@interface CustomMapView : MKMapView <MKMapViewDelegate>

@property (strong, nonatomic) MKTileOverlay *tileOverlay;

@end

CustomMapView.m

#import "CustomMapView.h"
#import "ColorBlendTileOverlayRenderer.h"


@implementation CustomMapView


-(instancetype)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];
    if (self) {
        self.delegate = self;
    }
    return self;
}

-(instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    return self;
}

-(void)awakeFromNib {
    [super awakeFromNib];
    [self reloadTileOverlay];
}

#pragma mark - TileOverlay

-(void)reloadTileOverlay {
    
    // remove existing map tile overlay
    if(self.tileOverlay) {
        [self removeOverlay:self.tileOverlay];
    }
    
    NSString *urlTemplate = nil;
    urlTemplate = @"http://mt0.google.com/vt/x={x}&y={y}&z={z}";
    self.tileOverlay = [[MKTileOverlay alloc] initWithURLTemplate:urlTemplate];
    self.tileOverlay.canReplaceMapContent=YES;
    [self addOverlay:self.tileOverlay];
}


@end

MapRendererHelper.h

#import <MapKit/MapKit.h>
#import <Foundation/Foundation.h>

@interface MapRendererHelper : NSObject

+(MKOverlayRenderer *)rendererForOverlay:(id<MKOverlay>)overlay;
@end

MapRendererHelper.m

#import "MapRendererHelper.h"
#import "ColorBlendTileOverlayRenderer.h"

@implementation MapRendererHelper

+(MKOverlayRenderer *)rendererForOverlay:(id<MKOverlay>)overlay {
    if ([overlay isKindOfClass:[MKTileOverlay class]]) {
        MKTileOverlay *tileOverlay = (MKTileOverlay *)overlay;
        MKTileOverlayRenderer *renderer = nil;
        renderer = [[ColorBlendTileOverlayRenderer alloc] initWithTileOverlay:tileOverlay];
        return renderer;
    } else {
        return nil;
    }
}
@end