Workaround a bug in UIKit that prevents QLPreviewController to be loaded from a nib

QLPreviewController+NSCodingFix.m

#import <QuickLook/QuickLook.h>
#import <objc/runtime.h>

@implementation QLPreviewController (NSCodingFix)

+ (void) load
{
	Method initWithCoder = class_getInstanceMethod(self, @selector(initWithCoder_nscodingfix:));
	class_addMethod(self, @selector(initWithCoder:), method_getImplementation(initWithCoder), method_getTypeEncoding(initWithCoder));
}

- (id) initWithCoder_nscodingfix:(NSCoder *)decoder
{
	if (!(self = [super initWithCoder:decoder]))
		return nil;
	
	@try
	{
		#pragma clang diagnostic push
		#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
		[self performSelector:NSSelectorFromString([@[@"_", @"common", @"Init"] componentsJoinedByString:@""])];
		#pragma clang diagnostic pop
	}
	@catch (NSException *exception)
	{
		NSLog(@"-[QLPreviewController _commonInit] failed, trouble ahead.");
	}
	
	return self;
}

@end