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我基于此代码：Custom MKAnnotationView with frame,icon and image

而且我正在尝试做一些不同的事情......我有一个不透明的图像，我想在里面放一个图像。我的问题是背景图像覆盖了我的图像。所以它看起来像：http ://cl.ly/image/0E0S00072G1n

我的代码是这样的：

    annotationImageView.image = [UIImage imageNamed:@"marker_fb"];

    UIImage *frame = [UIImage imageNamed:@"marker_fb"];
    ImagePin *imagePinImage = annotation;   

    NSString *urlStringForImage = [NSString stringWithFormat:@"%@", imagePinImage.image];
    NSURL *urlForImage = [NSURL URLWithString:urlStringForImage];
    UIImageView *imageView = [[UIImageView alloc] init];

    [imageView setImageWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@", urlForImage]] placeholderImage:[UIImage imageNamed:@"avatar-placeholder.png"]];

    UIGraphicsBeginImageContext(CGSizeMake(annotationImageView.image.size.width, annotationImageView.image.size.height));
    [frame drawInRect:CGRectMake(0, 0, frame.size.width, frame.size.height)];
    [imageView.image drawInRect:CGRectMake(2, 2, 48, 38)]; // the frame your inner image

    annotationImageView.image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

z-indez 是否存在于 object-c 中？或者我该怎么办？谢谢。 编辑：我也尝试过：

UIGraphicsBeginImageContextWithOptions(CGSizeMake(annotationImageView.image.size.width, annotationImageView.image.size.height), NO, 0);
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