更新iOS 11之后，用xcode 9运行App，你会发现导航栏返回按钮偏移20像素

下面我讲一下解决办法：

楼主写的分类：UIViewController+BarButton

代码如下：

//左侧一个图片按钮的情况

- (void)addLeftBarButtonWithImage:(UIImage *)image action:(SEL)action
{
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 44, 44)];
    view.backgroundColor = [UIColor clearColor];
    UIButton *firstButton = [UIButton buttonWithType:UIButtonTypeCustom];
    firstButton.frame = CGRectMake(0, 0, 44, 44);
    [firstButton setImage:image forState:UIControlStateNormal];
    [firstButton addTarget:self action:action forControlEvents:UIControlEventTouchUpInside];
    firstButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
    [firstButton setImageEdgeInsets:UIEdgeInsetsMake(0, 5 * kScreenWidth / 375.0, 0, 0)];
    
    UIBarButtonItem *leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:firstButton];
    self.navigationItem.leftBarButtonItem = leftBarButtonItem;
}

//右侧一个图片按钮的情况

- (void)addRightBarButtonWithFirstImage:(UIImage *)firstImage action:(SEL)action
{
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 44, 44)];
    view.backgroundColor = [UIColor clearColor];
    
    UIButton *firstButton = [UIButton buttonWithType:UIButtonTypeCustom];
    firstButton.frame = CGRectMake(0, 0, 44, 44);
    [firstButton setImage:firstImage forState:UIControlStateNormal];
    [firstButton addTarget:self action:action forControlEvents:UIControlEventTouchUpInside];
    firstButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentRight;
    [firstButton setImageEdgeInsets:UIEdgeInsetsMake(0, 0, 0, 5 * kScreenWidth / 375.0)];
    
    UIBarButtonItem *rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:firstButton];
    self.navigationItem.rightBarButtonItem = rightBarButtonItem;
}

//右侧为文字item的情况

- (void)addRightBarButtonItemWithTitle:(NSString *)itemTitle action:(SEL)action
{
    
    UIButton *rightbBarButton = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 88, 44)];
    [rightbBarButton setTitle:itemTitle forState:(UIControlStateNormal)];
    [rightbBarButton setTitleColor:kBlackColor forState:(UIControlStateNormal)];
    rightbBarButton.titleLabel.font = [UIFont systemFontOfSize:14];
    [rightbBarButton addTarget:self action:action forControlEvents:(UIControlEventTouchUpInside)];
    rightbBarButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentRight;
    [rightbBarButton setTitleEdgeInsets:UIEdgeInsetsMake(0, 0, 0, 5 * kScreenWidth/375.0)];
    
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithCustomView:rightbBarButton];
}

//左侧为文字item的情况

- (void)addLeftBarButtonItemWithTitle:(NSString *)itemTitle action:(SEL)action
{
    UIButton *leftbBarButton = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 44, 44)];
    [leftbBarButton setTitle:itemTitle forState:(UIControlStateNormal)];
    [leftbBarButton setTitleColor:kBlackColor forState:(UIControlStateNormal)];
    leftbBarButton.titleLabel.font = [UIFont systemFontOfSize:16];
    [leftbBarButton addTarget:self action:action forControlEvents:(UIControlEventTouchUpInside)];
    leftbBarButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
    [leftbBarButton setTitleEdgeInsets:UIEdgeInsetsMake(0, 5 * kScreenWidth/375.0, 0, 0)];
    
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]initWithCustomView:leftbBarButton];
}

//右侧两个图片item的情况

- (void)addRightTwoBarButtonsWithFirstImage:(UIImage *)firstImage firstAction:(SEL)firstAction secondImage:(UIImage *)secondImage secondAction:(SEL)secondAction
{
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 80, 44)];
    view.backgroundColor = [UIColor clearColor];
    
    UIButton *firstButton = [UIButton buttonWithType:UIButtonTypeCustom];
    firstButton.frame = CGRectMake(40, 0, 40, 44);
    [firstButton setImage:firstImage forState:UIControlStateNormal];
    [firstButton addTarget:self action:firstAction forControlEvents:UIControlEventTouchUpInside];
    firstButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;
    [firstButton setImageEdgeInsets:UIEdgeInsetsMake(0, 0, 0, - 8 * kScreenWidth/375.0)];
    [view addSubview:firstButton];
    
    UIButton *secondButton = [UIButton buttonWithType:UIButtonTypeCustom];
    secondButton.frame = CGRectMake(0, 0, 40, 44);
    [secondButton setImage:secondImage forState:UIControlStateNormal];
    [secondButton addTarget:self action:secondAction forControlEvents:UIControlEventTouchUpInside];
    secondButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;
    [secondButton setImageEdgeInsets:UIEdgeInsetsMake(0, 0, 0, - 15 * kScreenWidth/375.0)];
    [view addSubview:secondButton];
    
    UIBarButtonItem *rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:view];
    self.navigationItem.rightBarButtonItem = rightBarButtonItem;
}

//右侧三个图片item的情况

- (void)addRightThreeBarButtonsWithFirstImage:(UIImage *)firstImage firstAction:(SEL)firstAction secondImage:(UIImage *)secondImage secondAction:(SEL)secondAction thirdImage:(UIImage *)thirdImage thirdAction:(SEL)thirdAction
{
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 120, 44)];
    view.backgroundColor = [UIColor clearColor];
    
    UIButton *firstButton = [UIButton buttonWithType:UIButtonTypeCustom];
    firstButton.frame = CGRectMake(80, 0, 40, 44);
    [firstButton setImage:firstImage forState:UIControlStateNormal];
    [firstButton addTarget:self action:firstAction forControlEvents:UIControlEventTouchUpInside];
    firstButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;
    [firstButton setImageEdgeInsets:UIEdgeInsetsMake(0, 0, 0, - 8 * kScreenWidth/375.0)];
    [view addSubview:firstButton];
    
    UIButton *secondButton = [UIButton buttonWithType:UIButtonTypeCustom];
    secondButton.frame = CGRectMake(44, 0, 40, 44);
    [secondButton setImage:secondImage forState:UIControlStateNormal];
    [secondButton addTarget:self action:secondAction forControlEvents:UIControlEventTouchUpInside];
    secondButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;
    [secondButton setImageEdgeInsets:UIEdgeInsetsMake(0, 0, 0, - 5 * kScreenWidth/375.0)];
    [view addSubview:secondButton];
    
    UIButton *thirdButton = [UIButton buttonWithType:UIButtonTypeCustom];
    thirdButton.frame = CGRectMake(0, 0, 40, 44);
    [thirdButton setImage:thirdImage forState:UIControlStateNormal];
    [thirdButton addTarget:self action:thirdAction forControlEvents:UIControlEventTouchUpInside];
    [thirdButton setImageEdgeInsets:UIEdgeInsetsMake(0, 0, 0, - 5 * kScreenWidth/375.0)];
    [view addSubview:thirdButton];
    
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:view];
}

截图.png

使用方法：在viewDidLoad里直接调用

[self addLeftBarButtonWithImage:[UIImage imageNamed:@"点赞"] action:@selector(leftBarbuttonAction)];

如果觉得坐标有问题，可以去UIViewController+BarButton里更改。

注意：以上我写的方法，位置已经不会偏移了。
但是会出现item点击不准确的情况。借鉴了UINavigation-SXFixSpace的几个分类，解决了我的问题。谢谢此位大哥的分享。

demo位置