自定义标记图标的iOS质量差

Question

我试图将图像添加到标记， 如何达到最好的质量，因为你可以看到谷歌地图自己增加了两遍

http://i.imgur.com/5lJPUWv.png

Answer 1

你好你添加资产给你项目还是只有一个图像？

因此，您需要将图像资源（bigMarker.png，bigMarker@2x.png，bigMarker@3x.png）添加到项目资产中，如截图。这工作正常在iOS 9

，而我的代码示例中的viewDidLoad

// Add custom position in Kansas 
CustomAnnotation *annotation = [CustomAnnotation new]; 
annotation.title = @"Elevation Burger"; 
annotation.subtitle = @"The best buns..."; 
annotation.coordinate = CLLocationCoordinate2DMake(39.0119020f,-98.4842460f); 
[self.myMap addAnnotation:annotation]; 

而这其中的代表

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation { 

    MKAnnotationView *annotationView = nil; 
    if (annotation != mapView.userLocation) { 
     annotationView = [[MKAnnotationView alloc] initWithAnnotation:annotation 
                 reuseIdentifier:nil]; 
     annotationView.canShowCallout = YES; 
     annotationView.image = [UIImage imageNamed:@"bigMarker"]; 
     annotationView.leftCalloutAccessoryView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"burgerBitmap"]]; 

     UIButton *accessoryButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure]; 
     UIImage *disclosureButtonImage = [[UIImage imageNamed:@"disclosure"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]; 
     [accessoryButton setImage:disclosureButtonImage forState:UIControlStateNormal]; 
     annotationView.rightCalloutAccessoryView = accessoryButton; 
    } 
    return annotationView; 
}