Tweak padding in UIToolbar

gistfile1.m

NSMutableArray *items = [[NSMutableArray alloc] init];

UIBarButtonItem *negativeSpacer = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
negativeSpacer.width = -10;
[items addObject:negativeSpacer];

// add button here
// padding will be 10px less than default

[self.toolbar setItems:items animated:YES];