gistfile1.txt

NSString *imageName =[NSString stringWithString:[(Tweet*)[tweets objectAtIndex:indexPath.row] author]];
	NSString *userImage =[NSString stringWithString:[(Tweet*)[tweets objectAtIndex:indexPath.row]  profileImage]];
	NSArray *myArray = [userImage componentsSeparatedByString: @"/"];
	NSString *fileName = (NSString*)[myArray lastObject];
	NSString *picName =[NSString stringWithFormat:@"%@:%@", imageName, fileName];
	NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
	NSString *documentsDirectory = [paths objectAtIndex:0];
	
	NSString *dataPath = [documentsDirectory stringByAppendingPathComponent:@"/ProfilePictures"];
	NSString* path = [dataPath stringByAppendingPathComponent:picName];
	UIImage* image = [UIImage imageWithContentsOfFile:path];


 if (!image) {
                    [activityIndicator startAnimating];
                        UIImage *phoneImage=[UIImage imageWithData:[[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:userImage]]];
                       NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
	NSString *documentsDirectory = [paths objectAtIndex:0];
	
	NSString *dataPath = [documentsDirectory stringByAppendingPathComponent:@"/ProfilePictures"];


 NSError *error;
 if (![[NSFileManager defaultManager] fileExistsAtPath:dataPath])
  [[NSFileManager defaultManager] createDirectoryAtPath:dataPath withIntermediateDirectories:NO attributes:nil error:&error];


	NSString* path = [dataPath stringByAppendingPathComponent:picName];
                        NSData* data = UIImagePNGRepresentation(phoneImage);
                        [data writeToFile:path atomically:YES];
                                            }               
                else{
                    photo.image=image;
                    [activityIndicator stopAnimating];
                }