iOS 11导航返回按钮偏移的问题：

参考：http://blog.csdn.net/spicyShrimp/article/details/77891717

http://blog.csdn.net/spicyShrimp/article/details/78201042

http://www.jianshu.com/p/352f101d6df1

1、MJ刷新异常，上拉加载出现跳动刷新问题：

解决办法：初始化的时候增加以下代码（tableView和collectionView类似）

    if (@available(iOS11.0, *)) {

        _tableView.contentInsetAdjustmentBehavior =UIScrollViewContentInsetAdjustmentNever;

        _tableView.contentInset =UIEdgeInsetsMake(64,0,49,0);//64和49自己看效果，是否应该改成0

        _tableView.scrollIndicatorInsets =_tableView.contentInset;

    }

2、tableView的section之间间距变大问题：

解决办法：初始化的时候增加以下代码

     self.tableView.estimatedRowHeight =0;

     self.tableView.estimatedSectionHeaderHeight =0;

     self.tableView.estimatedSectionFooterHeight =0;

3、导航栏按钮偏移20像素问题

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 = [[UIViewalloc]initWithFrame:CGRectMake(0,0,44,44)];

    view.backgroundColor = [UIColorclearColor];

    

    UIButton *firstButton = [UIButtonbuttonWithType:UIButtonTypeCustom];

    firstButton.frame = CGRectMake(0, 0, 44, 44);

    [firstButton setImage:imageforState:UIControlStateNormal];

    [firstButton addTarget:selfaction:actionforControlEvents:UIControlEventTouchUpInside];

    

    if (!SYSTEM_VERSION_LESS_THAN(@"11")) {

        firstButton.contentHorizontalAlignment =UIControlContentHorizontalAlignmentLeft;

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

    }

    

    UIBarButtonItem *leftBarButtonItem = [[UIBarButtonItemalloc]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 = [[UIViewalloc]initWithFrame:CGRectMake(0,0,44,44)];

    view.backgroundColor = [UIColorclearColor];

    

    UIButton *firstButton = [UIButtonbuttonWithType:UIButtonTypeCustom];

    firstButton.frame = CGRectMake(0, 0, 44, 44);

    [firstButton setImage:firstImageforState:UIControlStateNormal];

    [firstButton addTarget:selfaction:actionforControlEvents:UIControlEventTouchUpInside];

    

    if (!SYSTEM_VERSION_LESS_THAN(@"11")) {

        firstButton.contentHorizontalAlignment =UIControlContentHorizontalAlignmentRight;

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

    }

    

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

    self.navigationItem.rightBarButtonItem = rightBarButtonItem;

}

//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 (!SYSTEM_VERSION_LESS_THAN(@"11")) {

        rightbBarButton.contentHorizontalAlignment =UIControlContentHorizontalAlignmentRight;

        [rightbBarButton setTitleEdgeInsets:UIEdgeInsetsMake(0,0,0, -5 * kScreenWidth/375.0)];

    }

    

    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 (!SYSTEM_VERSION_LESS_THAN(@"11")) {

        leftbBarButton.contentHorizontalAlignment =UIControlContentHorizontalAlignmentLeft;

        [leftbBarButton setTitleEdgeInsets:UIEdgeInsetsMake(0, -5  *kScreenWidth/375.0,0,0)];

    }

    

    self.navigationItem.leftBarButtonItem = [[UIBarButtonItemalloc]initWithCustomView:leftbBarButton];

}

在你的控制器里边，直接[self addleft...]就可以调用，如果觉得坐标有问题，可以自行处理变更

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。

===========

http://blog.csdn.net/sodaslay/article/details/78074625

2.scrollview的内容适配contentInsetAdjustmentBehavior（http://blog.csdn.net/HDFQQ188816190/article/details/78050242?locationNum=3&fps=1）

  self.tab.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;//UIScrollView也适用

1. 1.UIScrollView的属性contentInsetAdjustmentBehavior  
2. 2.UIScrollView的只读属性adjustedContentInset  
3. 3.UIView的只读属性safeAreaInsets 

==========下面是一个简单的导航按钮解决

#import <UIKit/UIKit.h>

@interface UIBarButtonItem (LeftBarbutton)

/*

 *添加返回按钮

 *imageStr  按钮图片名称

 *titleStr  按钮标题名称

 *action    方法，要在调用的那个控制器中实现

 *target    哪个控制器调用的

 */

+(NSArray *)backBtn:(SEL)action target:(id)target image:(NSString *)imageStr title:(NSString *)titleStr;

/*

 *添加右侧按钮

 *imageStr  按钮图片名称

 *titleStr  按钮标题名称

 *action    方法，要在调用的那个控制器中实现

 *target    哪个控制器调用的

 */

+(NSArray *)addrightBtn:(SEL)action target:(id)target image:(NSString *)imageStr title:(NSString *)titleStr;

@end

********************************

#import "UIBarButtonItem+LeftBarbutton.h"

@implementation UIBarButtonItem (LeftBarbutton)

//添加导航返回按钮

+(NSArray *)backBtn:(SEL)action target:(id)target image:(NSString *)imageStr title:(NSString *)titleStr{

    UIButton *backBtn=[[UIButtonalloc]initWithFrame:CGRectMake(0,0,80,44)];

    [backBtn setTitleColor:[UIColorblackColor]forState:UIControlStateNormal];

    backBtn.titleLabel.font=[UIFontsystemFontOfSize:12];

    UIBarButtonItem *backbtn=[[UIBarButtonItemalloc]initWithCustomView:backBtn];

    UIBarButtonItem *fixBtn=[[UIBarButtonItemalloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpacetarget:selfaction:nil];

    

    if(titleStr && ![titleStr isEqualToString:@""]){

        [backBtn setTitle:titleStrforState:UIControlStateNormal];

    }

    

    if(imageStr && ![imageStr isEqualToString:@""]){

        fixBtn.width=-30;

        [backBtn setImage:[UIImageimageNamed:imageStr]forState:UIControlStateNormal];

    }

    if(target && action){

        [backBtn addTarget:targetaction:actionforControlEvents:UIControlEventTouchUpInside];

    }

    //兼容IOS11

    CGFloat sysv= [[[UIDevicecurrentDevice]systemVersion]floatValue];

    if(sysv>=11.0){

        backBtn.contentHorizontalAlignment =UIControlContentHorizontalAlignmentLeft;

        [backBtn setImageEdgeInsets:UIEdgeInsetsMake(0,0,0,0)];

        

    }

   

    NSArray *btnArr=@[fixBtn,backbtn];

    return btnArr;

}

//添加导航右侧按钮

+(NSArray *)addrightBtn:(SEL)action target:(id)target image:(NSString *)imageStr title:(NSString *)titleStr{

    UIButton *rightBtn=[[UIButtonalloc]initWithFrame:CGRectMake(0,0,80,44)];

    [rightBtn setTitleColor:[UIColorwhiteColor]forState:UIControlStateNormal];

    [rightBtn.titleLabelsetFont:[UIFontsystemFontOfSize:14weight:UIFontWeightThin]];

    UIBarButtonItem *rbtn=[[UIBarButtonItemalloc]initWithCustomView:rightBtn];

    UIBarButtonItem *fixBtn=[[UIBarButtonItemalloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpacetarget:nilaction:nil];

    

    

    if(titleStr && ![titleStr isEqualToString:@""]){

        [rightBtn setTitle:titleStrforState:UIControlStateNormal];

        fixBtn.width=0;

    }

    

    if(imageStr && ![imageStr isEqualToString:@""]){

        [rightBtn setImage:[UIImageimageNamed:imageStr]forState:UIControlStateNormal];

        fixBtn.width=-20;

    }

    if(target && action){

        [rightBtn addTarget:targetaction:actionforControlEvents:UIControlEventTouchUpInside];

    }

    //兼容IOS11

    CGFloat sysv= [[[UIDevicecurrentDevice]systemVersion]floatValue];

    if(sysv>=11.0){

        rightBtn.contentHorizontalAlignment =UIControlContentHorizontalAlignmentRight;

        [rightBtn setTitleEdgeInsets:UIEdgeInsetsMake(0,0,0,0)];

    }

    NSArray *rightBtnArr=@[fixBtn,rbtn];

    return rightBtnArr;

}

@end

使用：

//设置导航右边按钮

-(void)addrightBtn{

    

    self.navigationItem.rightBarButtonItems=[UIBarButtonItemaddrightBtn:@selector(addListBtn)target:selfimage:@""title:@"我的投资"];

}

-(void)addListBtn{

   

}

//返回按钮

-(void)addbackBtn{

    

    self.navigationItem.leftBarButtonItems=[UIBarButtonItembackBtn:@selector(backBtn)target:selfimage:@"icon_navigation_back"title:@""];

}

-(void)backBtn{

    

}

==============IOS10  之后push出去后导航标题不显示的问题：

https://www.cnblogs.com/PaulpauL/p/6017817.html

原因是“iOS10在加载导航栏是总会加载系统的”。如果他说得对的话，也就是说push时系统会将自带的导航栏置顶，而隐藏后再显示只会显示自定义的导航栏。

=========

iOS10 title和leftBarButtonItem不显示

http://www.jianshu.com/p/402816df3903

=======ios11 tableview 显示偏移的问题：

http://blog.csdn.net/ycm1101743158/article/details/78086152