iOS随笔小记-- 修复iOS7以上自定义LeftBarbutt

修复很简单: 在自己定义的item前边加一个FixedSpace的BarButton.

UIBarButtonItem *negativeSpacer = [[UIBarButtonItem alloc] initWithBarButtonSystemItem: UIBarButtonSystemItemFixedSpace target:nil action:nil];    negativeSpacer.width = -15;    self.navigationItem.leftBarButtonItems = @[negativeSpacer, [[UIBarButtonItem alloc] initWithCustomView:button]];