ios7 去掉左侧空格

UIBarButtonItem *homeButton = [[UIBarButtonItem alloc] initWithCustomView:segmentView];
UIBarButtonItem *negativeSpacer = [[UIBarButtonItem alloc]
                                   initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace
                                   target:nil action:nil];
   negativeSpacer.width = -6;// it was -6 in iOS 6  you can set this as per your preference
[self.navigationItem setLeftBarButtonItems:[NSArray arrayWithObjects:negativeSpacer,homeButton, nil] animated:NO];