@interface UINavigationItem (margin)@end

@implementation UINavigationItem (margin)#if __ipHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_6_1- (void)setLeftBarButtonItem:(UIBarButtonItem *)_leftBarButtonItem{    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0)    {        UIBarButtonItem *negativeSeperator = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];        negativeSeperator.width = -12;                if (_leftBarButtonItem)        {            [self setLeftBarButtonItems:@[negativeSeperator, _leftBarButtonItem]];        }        else        {            [self setLeftBarButtonItems:@[negativeSeperator]];        }        [negativeSeperator release];    }    else    {        [self setLeftBarButtonItem:_leftBarButtonItem animated:NO];    }}- (void)setRightBarButtonItem:(UIBarButtonItem *)_rightBarButtonItem{    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0)    {        UIBarButtonItem *negativeSeperator = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];        negativeSeperator.width = -12;                if (_rightBarButtonItem)        {            [self setRightBarButtonItems:@[negativeSeperator, _rightBarButtonItem]];        }        else        {            [self setRightBarButtonItems:@[negativeSeperator]];        }        [negativeSeperator release];    }    else    {        [self setRightBarButtonItem:_rightBarButtonItem animated:NO];    }}#endif@end

UIBarButtonItem *leftBarItem = [[UIBarButtonItem alloc] initWithCustomView:btnBack];self.navigationItem.leftBarButtonItem = leftBarItem;[leftBarItem release];