ios开发之--iOS 11适配：iOS11导航栏返回偏移

UIBarButtonItem 左边间隙过大，解决方案(ios11之前)：   

调用下面的方法，设置negativeSpacer.width = -15;就可以解决间隙过大的问题：

UIBarButtonItem *leftItem = [[UIBarButtonItem alloc] initWithCustomView:dayOrWeekButton];
    self.navigationItem.leftBarButtonItem = leftItem;
    [dayOrWeekButton release];
    [leftItem release];
    if ([[[[UIDevice currentDevice] systemVersion] substringToIndex:1] intValue]>=7)
    {
        UIBarButtonItem *negativeSpacer = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
        negativeSpacer.width = -15;
        self.navigationItem.leftBarButtonItems = @[negativeSpacer, leftItem];
   }else{
        self.navigationItem.leftBarButtonItem = leftItem;
   }

 但是ios11以后，导航栏返回按钮偏移20像素，这个时候，上述方法就不行了，但是在之前是可以的，思路是这样的：写一个基类，在基类里面是把系统的导航给设置了下，并声明了几个方法，然后其他的控制器可以直接继承调用，当然也可以直接用一个view来自定义，这样也可以解决！

具体代码如下，判断系统版本号是为了更好的适配所以的机型（因为有好多人不喜欢升级系统）：

//左侧按钮
-(void)addLeftBarButtonWithImg:(UIImage *)image 
{
    UIButton *leftBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    leftBtn.frame = CGRectMake(0, 0, 60, 44);
    [leftBtn setImage:image forState:UIControlStateNormal];
    [leftBtn addTarget:self action:@selector(leftseaexitAction) forControlEvents:UIControlEventTouchUpInside];
    
    if (GetVesion == 11.0) {
        leftBtn.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
        [leftBtn setImageEdgeInsets:UIEdgeInsetsMake(0, -20, 0, 0)];
        UIBarButtonItem *leftBarBtnItem = [[UIBarButtonItem alloc]initWithCustomView:leftBtn];
        
        self.navigationItem.leftBarButtonItem = leftBarBtnItem;
    }else
    {
        UIBarButtonItem *leftBarBtnItem = [[UIBarButtonItem alloc]initWithCustomView:leftBtn];
        self.navigationItem.leftBarButtonItem = leftBarBtnItem;
    }
}

//右侧按钮
-(void)addRightBarButtonWithImg:(UIImage *)image r_hidden:(BOOL)r_hidden
{
    _rightButton = [UIButton buttonWithType:UIButtonTypeCustom];
    _rightButton.frame = CGRectMake(0, 0, 60, 44);
    _rightButton.hidden = r_hidden;
//    _rightButton.backgroundColor = [UIColor grayColor];
    [_rightButton setImage:image forState:UIControlStateNormal];
    [_rightButton addTarget:self action:@selector(clickRightBtn:) forControlEvents:UIControlEventTouchUpInside];
    
    if (GetVesion == 11.0) {
        _rightButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentRight;
        [_rightButton setImageEdgeInsets:UIEdgeInsetsMake(0, 0, 0, -20)];
        UIBarButtonItem *rightBarBtn = [[UIBarButtonItem alloc]initWithCustomView:_rightButton];
        self.navigationItem.rightBarButtonItem = rightBarBtn;
    }else
    {
        UIBarButtonItem *rightBarBtnItem = [[UIBarButtonItem alloc]initWithCustomView:_rightButton];
        self.navigationItem.leftBarButtonItem = rightBarBtnItem;
    }
    
}

//右侧为文字item的情况

- (void)addRightBarButtonItemWithTitle:(NSString *)itemTitle action:(SEL)action

{

    UIButton *rightbBarButton = [[UIButtonalloc]initWithFrame:CGRectMake(0,0,88,44)];

    [rightbBarButton setTitle:itemTitle forState:(UIControlStateNormal)];

    [rightbBarButton setTitleColor:kDarkOneColorforState:(UIControlStateNormal)];

    rightbBarButton.titleLabel.font = [UIFontsystemFontOfSize:14];

    [rightbBarButton addTarget:selfaction:actionforControlEvents:(UIControlEventTouchUpInside)];

    if (GetVesion == 11.0) { 

          rightbBarButton.contentHorizontalAlignment =UIControlContentHorizontalAlignmentRight; 

          [rightbBarButton setTitleEdgeInsets:UIEdgeInsetsMake(0,0,0, -20)]; 
} else
{
     //这里适配以前的版本写老方法就可以
}

self.navigationItem.rightBarButtonItem = [[UIBarButtonItemalloc]initWithCustomView:rightbBarButton]; 

}

//左侧为文字item的情况
- (void)addLeftBarButtonItemWithTitle:(NSString *)itemTitle action:(SEL)action
{
    UIButton *leftbBarButton = [[UIButtonalloc]initWithFrame:CGRectMake(0,0,44,44)];

    [leftbBarButton setTitle:itemTitleforState:(UIControlStateNormal)];

    [leftbBarButton setTitleColor:kDarkOneColorforState:(UIControlStateNormal)];

    leftbBarButton.titleLabel.font = [UIFontsystemFontOfSize:16];

    [leftbBarButton addTarget:selfaction:actionforControlEvents:(UIControlEventTouchUpInside)];

    if (GetVesion == 11.0) { 

       leftbBarButton.contentHorizontalAlignment =UIControlContentHorizontalAlignmentLeft; 

       [leftbBarButton setTitleEdgeInsets:UIEdgeInsetsMake(0, -5 *kScreenWidth/375.0,0,0)]; 
} else
{
     //这里适配以前的版本写老方法就可以
}

self.navigationItem.leftBarButtonItem = [[UIBarButtonItemalloc]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 = [[UIViewalloc]initWithFrame:CGRectMake(0,0,80,44)];

    view.backgroundColor = [UIColorclearColor];

    

    UIButton *firstButton = [UIButtonbuttonWithType:UIButtonTypeCustom];

    firstButton.frame = CGRectMake(44, 6, 30, 30);

    [firstButton setImage:firstImageforState:UIControlStateNormal];

    [firstButton addTarget:selfaction:firstActionforControlEvents:UIControlEventTouchUpInside];

    if (GetVesion == 11.0) { 

       firstButton.contentHorizontalAlignment =UIControlContentHorizontalAlignmentRight; 
 
       [firstButton setImageEdgeInsets:UIEdgeInsetsMake(0,0,0, -5 * kScreenWidth/375.0)]; 

} else
{
     //这里适配以前的版本写老方法就可以
}

[view addSubview:firstButton]; 

UIButton *secondButton = [UIButtonbuttonWithType:UIButtonTypeCustom]; 

secondButton.frame = CGRectMake(6, 6, 30, 30); 

[secondButton setImage:secondImageforState:UIControlStateNormal]; 

[secondButton addTarget:selfaction:secondActionforControlEvents:UIControlEventTouchUpInside]; 

if (GetVesion == 11.0) { 

secondButton.contentHorizontalAlignment =UIControlContentHorizontalAlignmentRight; 

[secondButton setImageEdgeInsets:UIEdgeInsetsMake(0,0,0, -5 * kScreenWidth/375.0)]; 

} 

[view addSubview:secondButton]; 

UIBarButtonItem *rightBarButtonItem = [[UIBarButtonItemalloc]initWithCustomView:view]; 

self.navigationItem.rightBarButtonItem = rightBarButtonItem; 

}

备注：千万别忘了，适配ios11之前的系统，最后在上面的if方法里面要适配以前的版本！

然后在控制器里面，直接 [self  方法]调用即可，如果坐标不合适可以自行处理，如果你的需求是三个四个item按钮，可以仿照上边两个item按钮的方法，自行处理。