iOS11导航栏自定义按钮偏移问题

iOS11之前小伙伴通过设置UIBarButtonSystemItemFixedSpace width=-10来解决按钮位置偏移问题，

    UIButton *leftBtn = [[UIButtonalloc] initWithFrame:CGRectMake(0,0, 44,44)];

    leftBtn.backgroundColor = [UIColorcyanColor];

    [leftBtn setImage:[UIImageimageNamed:@"back.png"]forState:UIControlStateNormal];

    [leftBtn addTarget:selfaction:@selector(back:)forControlEvents:UIControlEventTouchUpInside];

    UIBarButtonItem *leftItem = [[UIBarButtonItemalloc] initWithCustomView:leftBtn];

    

   UIBarButtonItem *ItemSpace = [[UIBarButtonItemalloc]

                                            initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace

                                            target:nil

                                            action:nil];

    

    if (MODEL_VERSION >=7.0) {

        

        ItemSpace.width = -10;

    }

    self.navigationItem.leftBarButtonItems =@[ItemSpace, leftItem];

如今iOS11上不可用了！！！

后来通过改变按钮的 contentEdgeInsets和imageEdgeInsets的值成功改变了按钮的偏移问题，单独设置contentEdgeInsets也可达到一定的效果。

    UIButton *leftBtn = [[UIButtonalloc] initWithFrame:CGRectMake(0,0, 44,44)];

    leftBtn.backgroundColor = [UIColorcyanColor];

    leftBtn.contentEdgeInsets =UIEdgeInsetsMake(0, -20,0, 0);

    leftBtn.imageEdgeInsets =UIEdgeInsetsMake(0, -15,0, 0);

    [leftBtn setImage:[UIImageimageNamed:@"back"]forState:UIControlStateNormal];

    [leftBtn addTarget:selfaction:@selector(back:)forControlEvents:UIControlEventTouchUpInside];

    UIBarButtonItem *leftItem = [[UIBarButtonItemalloc] initWithCustomView:leftBtn];

    

    self.navigationItem.leftBarButtonItems =@[leftItem];