Question

Android API有一个非常方便的类，IconGenerator。使用我的Android应用中的IconGenerator ，我可以轻松制作一个标记：

是一个简单的矩形，具有我选择的颜色。
调整大小以保存任意长度的文本。
不一个信息窗口 - 我希望标记本身包含文本，如下图所示的Android版本。

// Android - problem solved with IconGenerator
IconGenerator iconGenerator = new IconGenerator(context);
iconGenerator.setStyle(IconGenerator.STYLE_GREEN); // or any other color
Bitmap iconBitmap = iconGenerator.makeIcon(myString);
Marker m = new MarkerOptions().icon(BitmapDescriptorFactory.fromBitmap(iconBitmap))
                              .position(myLatLng);
map.addMarker(m); // map is a com.google.android.gms.maps.GoogleMap

有没有办法在使用Swift 的iOS中做一些简单的事情？已经有recent release的iOS API支持＆＃34;标记自定义＆＃34;，但我不知道如何将其应用于此用例。

// iOS (Swift) - I don't know how to create the icon as in code above
let marker = GMSMarker(position: myLatLng)
marker.icon = // How can I set to a rectangle with color/text of my choosing?
marker.map = map // map is a GMSMapView

Answer 1

这就是我所做的

let marker = GMSMarker()

// I have taken a pin image which is a custom image
let markerImage = UIImage(named: "mapMarker")!.withRenderingMode(.alwaysTemplate)

//creating a marker view
let markerView = UIImageView(image: markerImage)

//changing the tint color of the image
markerView.tintColor = UIColor.red

marker.position = CLLocationCoordinate2D(latitude: 28.7041, longitude: 77.1025)

marker.iconView = markerView
marker.title = "New Delhi"
marker.snippet = "India"
marker.map = mapView

//comment this line if you don't wish to put a callout bubble
mapView.selectedMarker = marker

输出

我的标记图像是

您可以根据需要更改颜色。此外，如果你想在rectange中使用某些东西，你可以创建一个简单的小矩形图像并像上面那样使用它并改变你需要的颜色。

或者如果你想要一个包含文字的矩形，你可以创建一个带有一些标签的小UIView，然后在UIView中转换UIImage并做同样的事情。

//function to convert the given UIView into a UIImage
func imageWithView(view:UIView) -> UIImage {
    UIGraphicsBeginImageContextWithOptions(view.bounds.size, false, 0.0)
    view.layer.render(in: UIGraphicsGetCurrentContext()!)
    let image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return image!
}

希望它有所帮助!!

Answer 2

以下是我为解决您面临的同一问题所做的工作。

我在我的图片资源中添加了以下图片，

现在我在我的代码中添加了以下方法：

-(UIImage*)drawText:(NSString*)text inImage:(UIImage*)image
{
    UIFont *font = [UIFont boldSystemFontOfSize:11];
    CGSize size = image.size;
    UIGraphicsBeginImageContextWithOptions(size, NO, 0.0f);
    [image drawInRect:CGRectMake(0, 0, size.width, size.height)];
    CGRect rect = CGRectMake(0, 0, image.size.width, image.size.height);

    NSMutableParagraphStyle *paragraphStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
    paragraphStyle.alignment = NSTextAlignmentCenter;
    NSDictionary *attributes = @{
                                 NSFontAttributeName : font,
                                 NSParagraphStyleAttributeName : paragraphStyle,
                                 NSForegroundColorAttributeName : [UIColor redColor]
                                 };
    CGSize textSize = [text sizeWithAttributes:attributes];
    CGRect textRect = CGRectMake((rect.size.width-textSize.width)/2, (rect.size.height-textSize.height)/2 - 2, textSize.width, textSize.height);
    [text drawInRect:CGRectIntegral(textRect) withAttributes:attributes];

    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return newImage;
}

现在，我调用了这个方法，同时将图标分配给GMSMarker，如下所示：

marker.icon = [self drawText:@"$33.6" inImage:[UIImage imageNamed:@"icon-marker"]];

它将生成如下图像图标：

在这里，我保持背景图像大小固定，因为我需要。您仍然可以自定义它以根据文本大小以及多行进行调整。

Answer 3

我尝试重写Mehul Thakkar对Swift 3的回答。希望它对你有用。但Dari表示自定义视图更容易。

func drawText(text:NSString, inImage:UIImage) -> UIImage? {

        let font = UIFont.systemFont(ofSize: 11)
        let size = inImage.size

        UIGraphicsBeginImageContext(size)

        inImage.draw(in: CGRect(x: 0, y: 0, width: size.width, height: size.height))
        let style : NSMutableParagraphStyle = NSMutableParagraphStyle.default.mutableCopy() as! NSMutableParagraphStyle
        style.alignment = .center
        let attributes:NSDictionary = [ NSFontAttributeName : font, NSParagraphStyleAttributeName : style, NSForegroundColorAttributeName : UIColor.red ]

        let textSize = text.size(attributes: attributes as? [String : Any])
        let rect = CGRect(x: 0, y: 0, width: inImage.size.width, height: inImage.size.height)
        let textRect = CGRect(x: (rect.size.width - textSize.width)/2, y: (rect.size.height - textSize.height)/2 - 2, width: textSize.width, height: textSize.height)
        text.draw(in: textRect.integral, withAttributes: attributes as? [String : Any])
        let resultImage = UIGraphicsGetImageFromCurrentImageContext()

        UIGraphicsEndImageContext()

        return resultImage
    }

Answer 4

您只需在Google地图中添加自定义视图作为标记。

let marker = GMSMarker(position: coordinate)
marker.iconView = view // Your Custom view here

您可以使用imageView（用于包含橙色框）和标签（用于文本）

Answer 5

这里是Eridana的Mehul Thakkar答案的Swift转换的Swift 5版本。

func drawTextT(text:NSString, inImage:UIImage) -> UIImage? {

    let font = UIFont.systemFont(ofSize: 11)
    let size = inImage.size

    UIGraphicsBeginImageContext(size)

    inImage.draw(in: CGRect(x: 0, y: 0, width: size.width, height: size.height))
    let style : NSMutableParagraphStyle = NSMutableParagraphStyle.default.mutableCopy() as! NSMutableParagraphStyle
    style.alignment = .center
    let attributes:NSDictionary = [ NSAttributedString.Key.font : font, NSAttributedString.Key.paragraphStyle : style, NSAttributedString.Key.foregroundColor : UIColor.red ]

    //let textSize = text.size(attributes: attributes as? [String : Any])
    let textSize = text.size(withAttributes: attributes as? [NSAttributedString.Key : Any] )

    let rect = CGRect(x: 0, y: 0, width: inImage.size.width, height: inImage.size.height)
    let textRect = CGRect(x: (rect.size.width - textSize.width)/2, y: (rect.size.height - textSize.height)/2 - 2, width: textSize.width, height: textSize.height)
    text.draw(in: textRect.integral, withAttributes: attributes as? [NSAttributedString.Key : Any]  )

    let resultImage = UIGraphicsGetImageFromCurrentImageContext()

    UIGraphicsEndImageContext()

    return resultImage
}

Answer 6

只有1张图片的最简单方法：

marker.icon = #imageLiteral(resourceName: "fault_marker")

1）在最新的X代码中，写出“ marker.icon = imageLiteral”。

2）双击刚才出现的虚拟图像图标。

3）选择所需的图像。

Answer 7

                    //func to get Image view 
                // Url String :-  Your image coming from server
//image :- Background image
                    func drawImageWithProfilePic(urlString:String, image: UIImage) -> UIImageView {

                        let imgView = UIImageView(image: image)
                        imgView.frame = CGRect(x: 0, y: 0, width: 90, height: 90)

                        let picImgView = UIImageView()
                        picImgView.sd_setImage(with:URL(string: urlString))
                        picImgView.frame = CGRect(x: 0, y: 0, width: 40, height: 40)
                        imgView.addSubview(picImgView)

                        picImgView.center.x = imgView.center.x
                        picImgView.center.y = imgView.center.y-10
                        picImgView.layer.cornerRadius = picImgView.frame.width/2
                        picImgView.clipsToBounds = true
                        imgView.setNeedsLayout()
                        picImgView.setNeedsLayout()

                //        let newImage = imageWithView(view: imgView)
                //        return newImage

                        return imgView
            }


    //SHOW ON MAP

         let marker = GMSMarker()
         marker.position = CLLocationCoordinate2D(latitude: Double(lat)!, longitude:  Double(long)!)
        marker.iconView = self.drawImageWithProfilePic(urlString:getProviderImage,image: UIImage.init(named: "red")!)

Answer 8

更改图标的最简单方法。只需将这3个图标（默认marker.png）替换为您的图标（1x，2x，3x）即可。

在Google群集中，标记（图标）更改存在问题。

谷歌地图iOS SDK：用作标记的自定义图标

8 个答案: