How to set color of templated image in NSTextAttachment

It seems that there’s a bug in UIKit. There’s a workaround for that ;]

For some reason you need to append empty space before image attachment to make it work properly with UIImageRenderingModeAlwaysTemplate.

So your snippet would look like that (mine is in ObjC):

- (NSAttributedString *)attributedStringWithValue:(NSString *)string image:(UIImage *)image {
    NSTextAttachment *attachment = [[NSTextAttachment alloc] init];
    attachment.image = image;

    NSAttributedString *attachmentString = [NSAttributedString attributedStringWithAttachment:attachment];
    NSMutableAttributedString *mutableAttributedString = [[NSMutableAttributedString alloc] initWithAttributedString:[[NSAttributedString alloc] initWithString:@" "]];
    [mutableAttributedString appendAttributedString:attachmentString];
    [mutableAttributedString addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:0] range:NSMakeRange(0, mutableAttributedString.length)]; // Put font size 0 to prevent offset
    [mutableAttributedString addAttribute:NSForegroundColorAttributeName value:[UIColor whiteColor] range:NSMakeRange(0, mutableAttributedString.length)];
    [mutableAttributedString appendAttributedString:[[NSAttributedString alloc] initWithString:@" "]];

    NSAttributedString *ratingText = [[NSAttributedString alloc] initWithString:string];
    [mutableAttributedString appendAttributedString:ratingText];
    return mutableAttributedString;
}