ios 处理图片固定其方向的一个方法

- (UIImage *)makeThumbnailFromImage:(UIImage *)srcImage scale:(double)imageScale

{

    

    UIImage *thumbnail = nil;

    

    CGSize imageSize = CGSizeMake(srcImage.size.width * imageScale, srcImage.size.height * imageScale);

    

    UIGraphicsBeginImageContext(imageSize);

    CGRect imageRect = CGRectMake(0.0, 0.0, imageSize.width, imageSize.height);

    [srcImage drawInRect:imageRect];

    

    thumbnail = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

return thumbnail;

}