从核心数据加载的iPhone UIImage逆时针旋转90度.怎么修？

- (UIImage *)rotateImage:(UIImage *)image {
    CGImageRef imageRef = image.CGImage;
    CGFloat width = CGImageGetWidth(imageRef);
    CGFloat height = CGImageGetHeight(imageRef);
    
    CGContextRef bitmap = CGBitmapContextCreate(nil, width, height,
                                                CGImageGetBitsPerComponent(imageRef),
                                                CGImageGetBytesPerRow(imageRef),
                                                CGImageGetColorSpace(imageRef),
                                                CGImageGetBitmapInfo(imageRef));
    
    CGContextRotateCTM(bitmap, M_PI_2);
    CGContextDrawImage(bitmap, CGRectMake(0, 0, height, width), imageRef);
    
    CGImageRef rotatedImageRef = CGBitmapContextCreateImage(bitmap);
    UIImage *rotatedImage = [UIImage imageWithCGImage:rotatedImageRef];
    
    CGContextRelease(bitmap);
    CGImageRelease(rotatedImageRef);
    
    return rotatedImage;
}

- (UIImage *)rotateImage:(UIImage *)image {
    UIGraphicsBeginImageContextWithOptions(image.size, NO, image.scale);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextRotateCTM(context, M_PI_2);
    [image drawAtPoint:CGPointMake(0, -image.size.width)];
    UIImage *rotatedImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return rotatedImage;
}