//saving an image
 1 - (void)saveImage:(UIImage*)image:(NSString*)imageName {
 2 
 3 NSData *imageData = UIImagePNGRepresentation(image); //convert image into .png format.
 4 
 5 NSFileManager *fileManager = [NSFileManager defaultManager];//create instance of NSFileManager
 6 
 7 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); //create an array and store result of our search for the documents directory in it
 8 
 9 NSString *documentsDirectory = [paths objectAtIndex:0]; //create NSString object, that holds our exact path to the documents directory
10 
11 NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.png", imageName]]; //add our image to the path
12 
13 [fileManager createFileAtPath:fullPath contents:imageData attributes:nil]; //finally save the path (image)
14 
15 NSLog(@"image saved");
16 
17 }

//removing an image
 1 - (void)removeImage:(NSString*)fileName {
 2 
 3 NSFileManager *fileManager = [NSFileManager defaultManager];
 4 
 5 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
 6 
 7 NSString *documentsDirectory = [paths objectAtIndex:0];
 8 
 9 NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.png", fileName]];
10 
11 [fileManager removeItemAtPath: fullPath error:NULL];
12 
13 NSLog(@"image removed");
14 
15 }

//loading an image
 1 - (UIImage*)loadImage:(NSString*)imageName {
 2 
 3 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
 4 
 5 NSString *documentsDirectory = [paths objectAtIndex:0];
 6 
 7 NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.png", imageName]];
 8 
 9 return [UIImage imageWithContentsOfFile:fullPath];
10 
11 }