iOS-自定义导航条

前言

随着项目功能的需要，可能有些界面的导航条比较特殊，比如

需要添加不同的按钮，比如扫码，心愿单，分享，更多等等。
需要将菜单替换成图片
需要隐藏整个导航条
需要随着滚动，导航条背景跟着变色
隐藏导航条底部的线条
...
所以自定义一个导航条就显得至关重要了。

效果图

addGes.gif

实现思路

1.自定义一个导航条视图 NaviBarView，并且对外提供各种方法可以动态修改要展示的内容。
2.定义一个 VC 的基类，项目中所有的 VC 都继承它。在它里面创建并且维护一个导航条，隐藏系统自带的导航条，并且对外提供各种方法。

部分相关代码如下

1.NaviBarView类的实现

NaviBarView.h

#import <UIKit/UIKit.h>
@class BaseViewController;

#define StatusBarHeight [[UIApplication sharedApplication] statusBarFrame].size.height
#define NavBarHeight 44
#define NavHeight (StatusBarHeight + NavBarHeight)
#define ScreenWidth [UIScreen mainScreen].bounds.size.width
#define ScreenHeight [UIScreen mainScreen].bounds.size.height

/**
 导航条
 */
@interface NaviBarView : UIView

@property (retain, nonatomic) UIView *statusBar;    // 状态栏
@property (retain, nonatomic) UIView *navigationBar;    // 导航条
@property (retain, nonatomic) UIButton *rightWishBtn;   // 右侧分享按钮
@property (retain, nonatomic) UIButton *leftMenuBtn;    // 左侧菜单栏
@property (retain, nonatomic) UIButton *backBtn;    // 返回按钮
@property (retain, nonatomic) UILabel *titleLabel;  // 标题
@property(nonatomic, strong)UIView *lineView;   // 底部分割线

- (instancetype)initWithController:(BaseViewController *)controller;

// 扫码和心愿单
- (void)addScanAndWishList;
// 添加返回按钮
- (void)addBackBtn;
// 添加底部分割线
- (void)addBottomSepLine;
// 设置标题
- (void)setNavigationTitle:(NSString *)title;
// 设置导航条透明
- (void)clearNavBarBackgroundColor;

// 右侧添加按钮
- (UILabel *)addRightMenu:(NSString *)actionName withAction:(SEL)action;

@end

NaviBarView.m初始化

// 初始化
- (instancetype)initWithController:(BaseViewController *)controller {
    _controller = controller;
    
    self = [super initWithFrame:CGRectMake(0, 0, ScreenWidth, NavHeight)];
    self.backgroundColor = [UIColor clearColor];
    self.layer.zPosition = 999999;
    
    // 最顶部的状态栏
    _statusBar = [[UIView alloc] initWithFrame:CGRectMake(0, 0, ScreenWidth, StatusBarHeight)];
    _statusBar.backgroundColor = [UIColor whiteColor];
    [self addSubview:_statusBar];
    
    _navigationBar = [[UIView alloc] initWithFrame:CGRectMake(0, StatusBarHeight, ScreenWidth, NavBarHeight)];
    _navigationBar.backgroundColor = [UIColor whiteColor];
    [self addSubview:_navigationBar];

    return self;
}

NavBarView.m添加视图 - 只罗列部分代码

// 返回按钮
- (void)addBackBtn {
    // 不能添加多个
    UIView *srcBack = [_navigationBar viewWithTag:TagBackBtn];
    if (srcBack)
        return;
    
    UIImage *background = [[UIImage imageNamed:@"nav_back_black"] ifRTLThenOrientationUpMirrored];
    UIImage *backgroundOn = [[UIImage imageNamed:@"nav_back_black"] ifRTLThenOrientationUpMirrored];
    
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button setAccessibilityIdentifier:@"TopBackBtn"];
    button.tag = TagBackBtn;
    [button onTap:self action:@selector(doBackPrev)];
    
    [button setImage:background forState:UIControlStateNormal];
    [button setImage:backgroundOn forState:UIControlStateHighlighted];
    
    button.frame = CGRectMake(0, 0, 60, 44);
    button.contentEdgeInsets = UIEdgeInsetsMake(7, 7, 7, 20);
    [_navigationBar addSubview:button];
    [button rtlToParent];
    _backBtn = button;
}

// 添加顶部右边的文字类的按钮
- (UILabel *)addRightMenu:(NSString *)actionName withAction:(SEL)action {
    
    // 当重复添加时,移除旧的按钮
    UILabel *srcLabel = (UILabel *)[_navigationBar viewWithTag:TagRightMenu];
    if (srcLabel) {
        [srcLabel removeFromSuperview];
    }
    
    UILabel *lb = [[UILabel alloc] initWithFrame:CGRectMake(ScreenWidth - 110, 0, 100, 44)];
    lb.backgroundColor = [UIColor clearColor];
    lb.font = [UIFont systemFontOfSize:16];
    lb.textColor = [UIColor blackColor];
    lb.text = actionName;
    lb.userInteractionEnabled = YES;
    lb.textAlignment = NSTextAlignmentRight;
    lb.tag = TagRightMenu;
    [lb onTap:_controller action:action];
    [_navigationBar addSubview:lb];
    [lb rtlToParent];
    _rightMenuView = lb;
    return lb;
}

NaviBarView.m - 一些设置方法

#pragma mark - set

- (void)clearNavBarBackgroundColor {
    _statusBar.backgroundColor = [UIColor clearColor];
    _navigationBar.backgroundColor = [UIColor clearColor];
    _titleLabel.textColor = [UIColor whiteColor];
    [_navigationBar removeChildByTag:kTagLine];
}

- (void)setNavigationTitle:(NSString *)title {
    self.titleLabel.text = title;
}

- (void)setBackImage:(NSString *)imageName {
    UIImage *background = [UIImage imageNamed:imageName];
    UIImage *backgroundOn = [UIImage imageNamed:imageName];
    [_backBtn setImage:background forState:UIControlStateNormal];
    [_backBtn setImage:backgroundOn forState:UIControlStateHighlighted];
}

####### 2.BaseViewController基类的实现

BaseViewController.h部分代码

/**
 基类
 */
@interface BaseViewController : UIViewController

#pragma mark - 导航条相关
@property(nonatomic, copy)NSString *naviTitle;  // 标题
/** 导航条 */
@property(nonatomic, strong)NaviBarView *topNavBar;
/** 内容视图 */
@property (strong, nonatomic) UIView *containerView;

// 返回按钮点击操作
- (void)doBackPrev;
// 扫码和心愿单
- (void)addScanAndWishList;
// 设置导航条透明
- (void)clearNavBarBackgroundColor;

// 添加按钮
- (UIButton *)addBtnWithTitle:(NSString *)title action:(SEL)action;

- (UILabel *)addRightMenu:(NSString *)actionName withAction:(SEL)action;

@end

BaseViewController.m实现

@implementation BaseViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // setup data
    self.view.backgroundColor = [UIColor whiteColor];
    // 所有界面隐藏导航栏,用自定义的导航栏代替
    self.fd_prefersNavigationBarHidden = YES;
    // drawUI
    [self drawTopNaviBar];
}
@end

为什么要设置fd_prefersNavigationBarHidden参数为 YES，因为本项目是使用FDFullscreenPopGesture来管理导航条，隐藏系统的导航条已经被它所实现了。

- (void)fd_viewWillAppear:(BOOL)animated
{
    // Forward to primary implementation.
    [self fd_viewWillAppear:animated];
    
    if (self.fd_willAppearInjectBlock) {
        self.fd_willAppearInjectBlock(self, animated);
    }
    
    //设置导航的显示/隐藏
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(CGFLOAT_MIN * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        UIViewController *vc = [self.navigationController.viewControllers lastObject];
        if (vc.fd_prefersNavigationBarHidden) {
            [self.navigationController setNavigationBarHidden:YES animated:NO];
        } else {
            [self.navigationController setNavigationBarHidden:NO animated:NO];
        }
    });
}

在界面即将显示的时候，将导航条推至最前面，避免被其他视图遮挡

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    if (self.navigationController.navigationBar.height == 0) {
        _topNavBar.alpha = 0;
    }
    // 将导航放到最顶部,不然后面有其它的层会被覆盖
    [self.view bringSubviewToFront:_topNavBar];
}

导航条的绘制

/// 在旋转界面时重新构造导航条
- (void)drawTopNaviBar {
    if (_topNavBar) {
        [_topNavBar removeFromSuperview];
    }
    // 添加自定义的导航条
    NaviBarView *naviBar = [[NaviBarView alloc] initWithController:self];
    [self.view addSubview:naviBar];
    self.topNavBar = naviBar;
    
    if (![self isKindOfClass:[HomeViewController class]] && ![self isKindOfClass:[AccountViewController class]]) {
        // 添加返回按钮
        [_topNavBar addBackBtn];
        // 添加底部分割线 - 如果不需要添加,这里处理即可
        [_topNavBar addBottomSepLine];
    }
    
    // 自动放一个容器在下面,如果全屏的界面就往 self.view 加子,非全屏的往 container 加
    self.containerView = [[UIView alloc] initWithFrame:CGRectMake(0, NavHeight, ScreenWidth, ScreenHeight - NavHeight)];
    self.containerView.backgroundColor = [UIColor whiteColor];
    [self.view addSubview:self.containerView];
}

还有其他代码请下载本文的项目即可

3.使用

新建的 VC 必须继承自BaseViewController才可以使用

3.1 导航条添加扫码，搜索，心愿单功能

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    // 添加扫码,搜索,心愿单
    [self addScanAndWishList];
}

image.png

3.2 导航条正常样式+右侧添加分享图标

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    self.naviTitle = @"First VC";
    
    [self addRightMenu:@"分享" withAction:@selector(tapShare)];
}

image.png

3.3 导航条只有返回按钮，没有标题，没有底部线条

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    self.naviTitle = @"隐藏导航条分割线";
    [self clearNavBarBackgroundColor];
}

image.png

更多功能，只需要根据需要，自定义导航条视图类NaviBarView即可。

如有错误，欢迎指正，多多点赞，打赏更佳，您的支持是我写作的动力。

项目连接地址 - FDFullScreenPopGestureDemo

iOS-自定义导航条

前言

效果图

实现思路

1.NaviBarView类的实现

3.使用

3.1 导航条添加扫码，搜索，心愿单功能

3.2 导航条正常样式+右侧添加分享图标

3.3 导航条只有返回按钮，没有标题，没有底部线条

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