UIBarButtonItem 位置问题

NSInteger inset = App_Frame_Width == 414 ? 10:6;
self.navigationItem.rightBarButtonItem.imageInsets = UIEdgeInsetsMake(0,-inset,0,inset);

UIBarButtonItem *fixedSpaceBarButtonItem = [[UIBarButtonItem 
alloc] 
initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace 
target:nil action:nil];
self.navigationItem.leftBarButtonItems = @[fixedSpaceBarButtonItem,backBtnItem];