如何从Images.xcassets中获取LaunchImage的图片

+ (UIImage *)getTheLaunchImage
{
    CGSize viewSize = [UIScreen mainScreen].bounds.size;

    NSString *viewOrientation = nil;
    if (([[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationPortraitUpsideDown) || ([[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationPortrait)) {
        viewOrientation = @"Portrait";
    } else {
        viewOrientation = @"Landscape";
    }


    NSString *launchImage = nil;

    NSArray* imagesDict = [[[NSBundle mainBundle] infoDictionary] valueForKey:@"UILaunchImages"];
    for (NSDictionary* dict in imagesDict)
    {
        CGSize imageSize = CGSizeFromString(dict[@"UILaunchImageSize"]);

        if (CGSizeEqualToSize(imageSize, viewSize) && [viewOrientation isEqualToString:dict[@"UILaunchImageOrientation"]])
        {
            launchImage = dict[@"UILaunchImageName"];
        }
    }

    return [UIImage imageNamed:launchImage];

}