NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath2 = [NSString stringWithFormat:@"%@/%@.png", documentsDirectory, fileName];

[UIImagePNGRepresentation(imageToSave) writeToFile:filePath2 atomically:YES];