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        if ([self.delegate respondsToSelector:@selector(pdfViewController:didDisplayDocument:)]) {
            [self.delegate pdfViewController:self didDisplayDocument:self.document];
        }

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// checks if already in current queue, prevents deadlock
void dispatch_sync_reentrant(dispatch_queue_t queue, dispatch_block_t block) {
	if (dispatch_get_current_queue() == queue) {
		block();
	}else {
		dispatch_sync(queue, block);
	}
}

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- (void)animateImageView:(UIImageView *)imageView newImage:(UIImage *)image {
    // build animation block
    CATransition *transition = [CATransition animation];
    transition.duration = 0.25f;
    transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    transition.type = kCATransitionFade;
    [imageView.layer addAnimation:transition forKey:@"image"];
    
    // set new image
    imageView.image = image;

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BOOL PSIsCrappyDevice(void) {
    static BOOL isCrappyDevice = YES;
    
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        BOOL isSimulator = NO;
        BOOL isIPad2 = (PSIsIpad() && [UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera]);
        BOOL hasRetina = [[UIScreen mainScreen] scale] > 1.f;
        
        // enable animations on simulator

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// create basic UI
Titanium.UI.setBackgroundColor('#000');
var tabGroup = Titanium.UI.createTabGroup();
var win1 = Titanium.UI.createWindow({  
    title:'PSPDFKit',
    backgroundColor:'#fff'
});
var tab1 = Titanium.UI.createTab({  
    title:'PSPDFKit',
    window:win1

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- (void)dealloc {
    webView_.delegate = nil; // delegate is self here, so first set to nil before call stopLoading.
    [webView_ stopLoading];
    
    // UIWebView must be released in the main thread, or we get:
    // Tried to obtain the web lock from a thread other than the main thread or the web thread. This may be a result of calling to UIKit from a secondary thread. Crashing now...
    // This is less evil than the proposed http://stackoverflow.com/questions/945082/uiwebview-in-multithread-viewcontroller
    // Calling removeFromSuperview in a dealloc is ugly and evil, but else UIView has a strong reference to UIWebView and our main-release call would be irrelevant.
    if (![NSThread isMainThread]) {
        [webView_ performSelectorOnMainThread:@selector(removeFromSuperview) withObject:nil waitUntilDone:YES];        

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PSPDFSetLocalizationDictionary(@{@"en" :
                               @{@"Go to %@" : @"Browse %@",
                                 @"%d of %d" : @"Page %d of %d",
                                 }});

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// enable to see memory usage (don't enable in production code)
kPSPDFKitDebugMemory = YES;

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// ARC is compatible with iOS 4.0 upwards, but you need at least Xcode 4.2 with Clang LLVM 3.0 to compile it.
#if !defined(__clang__) || __clang_major__ < 3 || !__has_feature(objc_arc)
#error This project must be compiled with ARC (Xcode 4.2+ with LLVM 3.0 and above)
#endif

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#include <sys/xattr.h>

/// Set a flag that the files shouldn't be backuped to iCloud.
+ (void)addSkipBackupAttributeToFile:(NSString *)filePath {
    u_int8_t b = 1;
    setxattr([filePath fileSystemRepresentation], "com.apple.MobileBackup", &b, 1, 0, 0);
}

/// Returns the legacy storage path, used when the com.apple.MobileBackup file attribute is not available.
+ (NSString *)legacyStoragePath {