douglashill

// This is more hacky than it should be!
- (UIModalPresentationStyle)pspdf_currentPresentationStyle {
    UIViewController *vc = self.presentedViewController.presentingViewController;
    
    if ([self respondsToSelector:@selector(adaptivePresentationStyleForTraitCollection:)]) {
        UIModalPresentationStyle const style = [self adaptivePresentationStyleForTraitCollection:vc.traitCollection];
        return (style == UIModalPresentationNone) ? self.presentationStyle : style;
    }

    // Before iOS 8.3 we have to fall back on assuming adaptivity is only possible for horizontally compact environments.

douglashill

@import ImageIO;

@implementation UIImage (DHImageDecoding)

/// Warning: do not use. This looks like it should work, but it blocks the main thread for non-obvious reasons.
+ (UIImage *)dh_decodedImageWithData:(NSData *)data
{
	CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL);
	if (source == NULL) {
		return nil;

douglashill

NSString * NSStringFromCATransform3D(CATransform3D t)
{
    return [NSString stringWithFormat:@"CATransform3D {\n% 7.2f % 7.2f % 7.2f % 7.2f\n% 7.2f % 7.2f % 7.2f % 7.2f\n% 7.2f % 7.2f % 7.2f % 7.2f\n% 7.2f % 7.2f % 7.2f % 7.2f\n}", t.m11, t.m12, t.m13, t.m14, t.m21, t.m22, t.m23, t.m24, t.m31, t.m32, t.m33, t.m34, t.m41, t.m42, t.m43, t.m44];
}