如何更改群集的图标

Question

我有一个基于地图的应用程序，使用谷歌地图的iOS SDK。我需要更改集群图标，因为它在集群上显示圆形图像。就像在谷歌地图SDK中一样，圆圈正在创建，其中显示了许多标记。如何更改集群的图标，因为它显示的是棕色圆圈？请帮帮我，我急需它。下面是集群创建代码

- (UIImage*) generateClusterIconWithCount:(NSUInteger)count {
    int diameter = 40;
    float inset = 3;
    CGRect rect = CGRectMake(0, 0, diameter, diameter);
    UIGraphicsBeginImageContextWithOptions(rect.size, NO, 0);
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    // set stroking color and draw circle
    [[UIColor colorWithRed:1 green:1 blue:1 alpha:0.8] setStroke];
    [[UIColor brownColor] setFill];
    CGContextSetLineWidth(ctx, inset);
    // make circle rect 5 px from border
    CGRect circleRect = CGRectMake(0, 0, diameter, diameter);
    circleRect = CGRectInset(circleRect, inset, inset);
    // draw circle
    CGContextFillEllipseInRect(ctx, circleRect);
    CGContextStrokeEllipseInRect(ctx, circleRect);
    CTFontRef myFont = CTFontCreateWithName( (CFStringRef)@"Helvetica-Bold", 18.0f, NULL);
    NSDictionary *attributesDict = [NSDictionary dictionaryWithObjectsAndKeys:
            (__bridge id)myFont, (id)kCTFontAttributeName,
                    [UIColor whiteColor], (id)kCTForegroundColorAttributeName, nil];
    // create a naked string
    NSString *string = [[NSString alloc] initWithFormat:@"%lu", (unsigned long)count];
    NSAttributedString *stringToDraw = [[NSAttributedString alloc] initWithString:string
                                                                       attributes:attributesDict];
    // flip the coordinate system
    CGContextSetTextMatrix(ctx, CGAffineTransformIdentity);
    CGContextTranslateCTM(ctx, 0, diameter);
    CGContextScaleCTM(ctx, 1.0, -1.0);
    CTFramesetterRef frameSetter = CTFramesetterCreateWithAttributedString((__bridge CFAttributedStringRef)(stringToDraw));
    CGSize suggestedSize = CTFramesetterSuggestFrameSizeWithConstraints(
                                                                        frameSetter, /* Framesetter */
                                                                        CFRangeMake(0, stringToDraw.length), /* String range (entire string) */
                                                                        NULL, /* Frame attributes */
                                                                        CGSizeMake(diameter, diameter), /* Constraints (CGFLOAT_MAX indicates unconstrained) */
                                                                        NULL /* Gives the range of string that fits into the constraints, doesn't matter in your situation */
                                                                        );
    CFRelease(frameSetter);
    //Get the position on the y axis
    float midHeight = diameter;
    midHeight -= suggestedSize.height;
    float midWidth = diameter / 2;
    midWidth -= suggestedSize.width / 2;
    CTLineRef line = CTLineCreateWithAttributedString(
            (__bridge CFAttributedStringRef)stringToDraw);
    CGContextSetTextPosition(ctx, midWidth, 12);
    CTLineDraw(line, ctx);
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

Answer 1

检查这个！

-(UIImage*) generateClusterIconWithCount:(NSUInteger)count {
    int diameter = 40;
    float inset = 3;

    CGRect rect = CGRectMake(0, 0, diameter, diameter);
    UIGraphicsBeginImageContextWithOptions(rect.size, NO, 0);
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    // set stroking color and draw circle
   // [[UIColor colorWithRed:1 green:1 blue:1 alpha:0.8] setStroke];
   // [[UIColor brownColor] setFill];
    CGContextSetLineWidth(ctx, inset);
    // make circle rect 5 px from border
    CGRect circleRect = CGRectMake(0, 0, diameter, diameter);
    circleRect = CGRectInset(circleRect, inset, inset);
    UIImage *titleImage = [UIImage imageNamed:@"images.jpg"];
    [titleImage drawInRect:circleRect];
    // draw circle
    //CGContextFillEllipseInRect(ctx, circleRect);
   // CGContextStrokeEllipseInRect(ctx, circleRect);
    CTFontRef myFont = CTFontCreateWithName( (CFStringRef)@"Helvetica-Bold", 18.0f, NULL);
    NSDictionary *attributesDict = [NSDictionary dictionaryWithObjectsAndKeys:
                                    (__bridge id)myFont, (id)kCTFontAttributeName,
                                    [UIColor whiteColor], (id)kCTForegroundColorAttributeName, nil];
    // create a naked string
    NSString *string = [[NSString alloc] initWithFormat:@"%lu", (unsigned long)count];
    NSAttributedString *stringToDraw = [[NSAttributedString alloc] initWithString:string
                                                                       attributes:attributesDict];
    // flip the coordinate system
    CGContextSetTextMatrix(ctx, CGAffineTransformIdentity);
    CGContextTranslateCTM(ctx, 0, diameter);
    CGContextScaleCTM(ctx, 1.0, -1.0);
    CTFramesetterRef frameSetter = CTFramesetterCreateWithAttributedString((__bridge CFAttributedStringRef)(stringToDraw));
    CGSize suggestedSize = CTFramesetterSuggestFrameSizeWithConstraints(
                                                                        frameSetter, /* Framesetter */
                                                                        CFRangeMake(0, stringToDraw.length), /* String range (entire string) */
                                                                        NULL, /* Frame attributes */
                                                                        CGSizeMake(diameter, diameter), /* Constraints (CGFLOAT_MAX indicates unconstrained) */
                                                                        NULL /* Gives the range of string that fits into the constraints, doesn't matter in your situation */
                                                                        );
    CFRelease(frameSetter);
    //Get the position on the y axis
    float midHeight = diameter;
    midHeight -= suggestedSize.height;
    float midWidth = diameter / 2;
    midWidth -= suggestedSize.width / 2;
    CTLineRef line = CTLineCreateWithAttributedString(
                                                      (__bridge CFAttributedStringRef)stringToDraw);
    CGContextSetTextPosition(ctx, midWidth, 12);
    CTLineDraw(line, ctx);
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}