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//导航控制器全局设置导航按钮

//基础的导航控制器，统一处理返回按钮偏移的问题#import 
   
    NS_ASSUME_NONNULL_BEGIN@interface QMWNBasenav : UINavigationController@property (nonatomic,assign) BOOL isAlwaysShadow;@endNS_ASSUME_NONNULL_END****//基础的导航控制器，统一处理返回按钮偏移的问题#import "QMWNBasenav.h"@interface QMWNBasenav () @property(nonatomic,strong)UIImage * shadowView;    @end@implementation QMWNBasenav+ (void)initialize{    //    UINavigationBar *bar = [UINavigationBar appearanceWhenContainedIn:[self class], nil];    UINavigationBar *bar = [UINavigationBar appearance];    //[bar setBarTintColor:[UIColor gradientFromColor:gradiantFromColor toColor:gradiantToColor withWidth:SCREEN_WIDTH]];        [bar setTitleTextAttributes:@{NSFontAttributeName : [UIFont systemFontOfSize:20],NSForegroundColorAttributeName:[UIColor blackColor]}];    [bar setShadowImage:[[UIImage alloc] init]];    // 设置item    UIBarButtonItem *item = [UIBarButtonItem appearance];    // UIControlStateNormal    NSMutableDictionary *itemAttrs = [NSMutableDictionary dictionary];    itemAttrs[NSForegroundColorAttributeName] = [UIColor blackColor];    itemAttrs[NSFontAttributeName] = [UIFont systemFontOfSize:17];    [item setTitleTextAttributes:itemAttrs forState:UIControlStateNormal];    // UIControlStateDisabled    NSMutableDictionary *itemDisabledAttrs = [NSMutableDictionary dictionary];    itemDisabledAttrs[NSForegroundColorAttributeName] = [UIColor lightGrayColor];    [item setTitleTextAttributes:itemDisabledAttrs forState:UIControlStateDisabled];}- (void)viewDidLoad {    [super viewDidLoad];    //    [self.navigationBar setBackgroundImage:[UIImage imageNamed:@""] forBarMetrics:UIBarMetricsDefault];        // 如果滑动移除控制器的功能失效，清空代理(让导航控制器重新设置这个功能)    [self.interactivePopGestureRecognizer setEnabled:NO];    }- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated{        if (self.childViewControllers.count > 0) { // 如果push进来的不是第一个控制器                UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];        [button setImage:[UIImage imageNamed:@"navi_arrow_back"] forState:UIControlStateNormal];        button.size = CGSizeMake(40, 30);        // 让按钮内部的所有内容左对齐        button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;        //        [button sizeToFit];        // 让按钮的内容往左边偏移10        button.contentEdgeInsets = UIEdgeInsetsMake(0, 0, 0, 0);        [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];        [button setTitleColor:[UIColor whiteColor] forState:UIControlStateHighlighted];        [button addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];                // 修改导航栏左边的item        viewController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:button];                // 隐藏tabbar        viewController.hidesBottomBarWhenPushed = YES;        [self.navigationBar setShadowImage:self.shadowView];    }else{        if(self.isAlwaysShadow)        {            [self.navigationBar setShadowImage:self.shadowView];                    }else{            [self.navigationBar setShadowImage:[[UIImage alloc]init]];                    }            }        // 这句super的push要放在后面, 让viewController可以覆盖上面设置的leftBarButtonItem    [super pushViewController:viewController animated:animated];    }- (UIViewController *)popViewControllerAnimated:(BOOL)animated{        if (self.childViewControllers.count > 2){                [self.navigationBar setShadowImage:self.shadowView];            }else{                if(self.isAlwaysShadow)        {            [self.navigationBar setShadowImage:self.shadowView];                    }else{            [self.navigationBar setShadowImage:[[UIImage alloc]init]];                    }            }return [super popViewControllerAnimated:animated];    }- (void)back{    [self popViewControllerAnimated:YES];}@end
   

 

//添加返回按钮

-(void)backBtn{

    UIButton *backBtn=[[UIButtonalloc]initWithFrame:CGRectMake(0,10,60,20)];

    [backBtn setTitle:@"返回"forState:UIControlStateNormal];

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

    backBtn.imageEdgeInsets=UIEdgeInsetsMake(2,2,2,2);

    [backBtn setImage:[UIImageimageNamed:@"fanhui"]forState:UIControlStateNormal];

    [backBtn addTarget:self action:@selector(backto)forControlEvents:UIControlEventTouchDown];

    

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

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

    flexBtn.width=-10;//正数往左移，负数往右移

    self.navigationItem.leftBarButtonItems=@[flexBtn,leftBtn];

    

}

 

//返回按钮

-(void)backto{

    

    [selfdismissViewControllerAnimated:YEScompletion:^{

        

    }];

}

兼容IOS11：

//返回按钮

-(void)addbackBtn{

    

    UIButton *bbtn=[[UIButtonalloc]initWithFrame:CGRectMake(0, 0, 60, 30)];

    [bbtn setImage:[UIImageimageNamed:@"icon_navigation_back"]forState:UIControlStateNormal];

    [bbtn addTarget:selfaction:@selector(backBtn)forControlEvents:UIControlEventTouchDown];

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

    //兼容IOS11

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

if(sysv==11.0){

    bbtn.contentHorizontalAlignment =UIControlContentHorizontalAlignmentLeft;

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

}

    

   

if(sysv==11.0){

   

    }else {

    fixBtn.width=-30;

    }

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

    NSArray *btnArr=@[fixBtn,backbtn];

    self.navigationItem.leftBarButtonItems=btnArr;

}

 

========右侧按钮=======

 

//设置导航右边按钮

-(void)addrightBtn{

    UIButton *rightBtn=[[UIButtonalloc]initWithFrame:CGRectMake(0, 0, 60, 30)];

    [rightBtn setImage:[UIImageimageNamed:@"tianjia"]forState:UIControlStateNormal];

 

 

    [rightBtn addTarget:selfaction:@selector(addListBtn)forControlEvents:UIControlEventTouchDown];

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

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

    fixBtn.width=0;

    self.navigationItem.rightBarButtonItems=@[fixBtn,rbtn];

}

//兼容IOS11

 

//设置导航右边按钮

-(void)addrightBtn{

    UIButton *rightBtn=[[UIButton alloc]initWithFrame:CGRectMake(0, 0, 100, 30)];

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

    [rightBtn setTitle:@"设置"forState:UIControlStateNormal];

    //兼容IOS11

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

    if(sysv==11.0){

    rightBtn.contentHorizontalAlignment =UIControlContentHorizontalAlignmentRight;

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

    }

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

    [rightBtn addTarget:selfaction:@selector(addListBtn)forControlEvents:UIControlEventTouchDown];

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

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

   

if(sysv==11.0){

   

    }else {

    fixBtn.width=-30;

    }

    self.navigationItem.rightBarButtonItems=@[fixBtn,rbtn];

}

 

-(void)addListBtn{

 

 

}

 

 

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