iphone中非正式用法ui_orientation

来自Session 422, 给出的代码：

Convert the orientation property to UIImageOrientation:
UIImageOrientation ui_orientation (NSDictionary* props)
{
    int o = [[props valueForKey:(id)kCGImagePropertyOrientation] intValue];
    UIImageOrientation map[] = {
        UIImageOrientationUp,
        UIImageOrientationUp, UIImageOrientationUpMirrored,
        UIImageOrientationDown, UIImageOrientationDownMirrored,
        UIImageOrientationLeftMirrored, UIImageOrientationRight,
        UIImageOrientationRightMirrored, UIImageOrientationLeft,
    };
    return map[o];
}

给一个小提示：下载WWDC session的全部pdf。然后保存在你的硬盘驱动器中。不会占很多空间的。这样你找哪期关于CATransaction 或者编造的函数的时候，可以使用Spotlight帮你找。有session的标题