如何减少ios中uibarbutton和后退按钮之间的空间？

Question

我正在尝试使用与后退按钮箭头相邻的图像以及一些小空间。 我使用了下面的代码，但这增加了箭头和图像之间的空间。任何人都可以告诉我如何减少这个空间。

    UIButton *button1=[UIButton buttonWithType:UIButtonTypeCustom];

    [button1 setFrame:CGRectMake(-10, 2.0, 200, 42.0)];


    UIBarButtonItem *button = [[UIBarButtonItem alloc]initWithCustomView:button1];
    button.imageInsets = UIEdgeInsetsMake(0, -100, 0, -25); //this didn't worked out as expected ...i used this for reducnig space
     self.navigationItem.leftBarButtonItem = button;

//THis allows to add image  / button to the right of back button
self.navigationItem.leftItemsSupplementBackButton = YES;