ios - 自定义标记图标 iOS 质量差

Question

我正在尝试向标记添加图像。如何达到最佳品质？正如您所看到的，Google map 自己将其增加了两倍。

Answer 1

您是向项目添加 Assets 还是只添加一张图片？

因此，您需要将图像 Assets (命名为 - bigMarker.png、bigMarker@2x.png、bigMarker@3x.png)添加到您的项目 Assets ，如屏幕截图。这在 iOS 9 上运行良好。

我在 viewDidLoad 中的代码示例:

// 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];

委托(delegate)中的这个:

- (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;
}