Getting the Free Disk Space on an iOS device

freeDiskSpace.m

- (uint64_t)freeDiskspace
{
	uint64_t totalFreeSpace = 0;

	__autoreleasing NSError *error = nil;  
	NSString *path = [self applicationDocumentsDirectory];  
	NSDictionary *dictionary = [[NSFileManager defaultManager] attributesOfFileSystemForPath:path error: &error];  

	if (dictionary) {  
		NSNumber *freeFileSystemSizeInBytes = [dictionary objectForKey:NSFileSystemFreeSize];
		totalFreeSpace = [freeFileSystemSizeInBytes unsignedLongLongValue];
#ifndef NDEBUG
		NSNumber *fileSystemSizeInBytes = [dictionary objectForKey: NSFileSystemSize];  
		uint64_t totalSpace = [fileSystemSizeInBytes unsignedLongLongValue];
		NSLog(@"Memory Capacity of %llu MiB with %llu MiB Free memory available.", ((totalSpace/1024ll)/1024ll), ((totalFreeSpace/1024ll)/1024ll));
#endif
	} else {  
		NSLog(@"Error Obtaining System Memory Info: Domain = %@, Code = %@", [error domain], [error code]);  
	}  

	return totalFreeSpace;
}