[iOS微博项目 - 1.5] - NavigationBar标题按钮

2022-11-21 15:15:50

A.NavigationBar标题按钮

1.需求

在“首页”的导航栏中部设置一个“首页”文字+箭头按钮
统一设置样式
根据实际文本长度调整宽度
消除系统自带的点击高亮效果
点击按钮，箭头上下颠倒

github: https://github.com/hellovoidworld/HVWWeibo

2.思路

使用UIButton，设置文本和图片
在initWithFrame统一样式
创建一个继承UIButton的自定义类，重写文本和图片的绘图方法，互换位置
设置一个标识成员变量，判断当前的按钮状态（弹出 or 缩回）

3.实现

（1）自定义继承UIButton的类 HVWNavigationBarTitleButton

 //

 //  HVWNavigationBarTitleButton.m

 //  HVWWeibo

 //

 //  Created by hellovoidworld on 15/2/2.

 //  Copyright (c) 2015年 hellovoidworld. All rights reserved.

 //

 #import "HVWNavigationBarTitleButton.h"

 @implementation HVWNavigationBarTitleButton

 /** 重写initWithFrame, 统一设置按钮的样式 */

 - (instancetype)initWithFrame:(CGRect)frame {

     if (self = [super initWithFrame:frame]) {

         // 设置字体

         self.titleLabel.font = HVWNavigationTitleFont;

         [self setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

         // 文本右对齐

         [self.titleLabel setTextAlignment:NSTextAlignmentRight];

         // 取消图标高亮效果

         [self setAdjustsImageWhenDisabled:NO];

         // 图片居中

         [self.imageView setContentMode:UIViewContentModeCenter];

     }

     return self;

 }

 /** 重写iamge的绘图方法 */

 - (CGRect)imageRectForContentRect:(CGRect)contentRect {

     CGFloat height = contentRect.size.height;

     CGFloat width = height;

     CGFloat x = self.size.width - width;

     CGFloat y = ;

     return CGRectMake(x, y, width, height);

 }

 /** 重写title的绘图方法 */

 - (CGRect)titleRectForContentRect:(CGRect)contentRect {

     CGFloat height = contentRect.size.height;

     // 文本宽度 = 按钮整体宽度 - 图片宽度

     CGFloat width = self.height - height;

     CGFloat x = ;

     CGFloat y = ;

     return CGRectMake(x, y, width, height);

 }

 @end

（2）在“首页”控制器设置“标题按钮”:

HVWHomeViewController.m:

 - (void)viewDidLoad {

     [super viewDidLoad];

     // 添加导航控制器按钮

     // 左边按钮

     self.navigationItem.leftBarButtonItem = [UIBarButtonItem itemWithImage:@"navigationbar_friendsearch" hightlightedImage:@"navigationbar_friendsearch_highlighted" target:self selector:@selector(searchFriend)];

     // 右边按钮

     self.navigationItem.rightBarButtonItem = [UIBarButtonItem itemWithImage:@"navigationbar_pop" hightlightedImage:@"navigationbar_pop_highlighted" target:self selector:@selector(pop)];

     // 设置标题按钮

     HVWNavigationBarTitleButton *titleButton = [[HVWNavigationBarTitleButton alloc] init];

     titleButton.height = ;

     titleButton.width = ;

     [titleButton setTitle:@"首页" forState:UIControlStateNormal];

     [titleButton setImage:[UIImage imageWithNamed:@"navigationbar_arrow_down"] forState:UIControlStateNormal];

     // 设置背景图片

     [titleButton setBackgroundImage:[UIImage resizedImage:@"navigationbar_filter_background_highlighted"] forState:UIControlStateHighlighted];

     // 监听按钮点击事件，替换图标

     [titleButton addTarget:self action:@selector(titleButtonClickd:) forControlEvents:UIControlEventTouchUpInside];

     self.navigationItem.titleView = titleButton;

 }

 /** 标题栏按钮点击事件 */

 - (void) titleButtonClickd:(UIButton *) button {

     self.titleButtonExtended = !self.titleButtonExtended;

     if (self.isTitleButtonExtended) {

         [button setImage:[UIImage imageWithNamed:@"navigationbar_arrow_up"] forState:UIControlStateNormal];

     } else {

         [button setImage:[UIImage imageWithNamed:@"navigationbar_arrow_down"] forState:UIControlStateNormal];

     }

 }

 #mark：有希望依赖图片缓存，使用"=="判断当前按钮图片来决定按钮状态的，发现使用currentImage和新建一个UIImage（同一张图片）出来的地址并不一致！所以不能采用。

 -(void)titleButtonClick:(UIButton *)titleButton

 {

     UIImage *titleImage=[UIImage imageWithName:@"navigationbar_arrow_down"];

     if (titleButton.currentImage==titleImage) {

         //换成箭头向上

         [titleButton setImage:[UIImage imageWithName:@"navigationbar_arrow_up"] forState:UIControlStateNormal];

     }else

     {

         //换成箭头向下

         [titleButton setImage:[UIImage imageWithName:@"navigationbar_arrow_down"] forState:UIControlStateNormal];

     }

 }

B.导航栏标题按钮弹出框

1.需求

点击导航栏标题按钮弹出一个框

点击框外的其他地方，隐藏此框

2.思路

因为框的范围涉及到了导航栏，所以不能放在导航栏下的内容界面控制器上，要放在导航栏上

在框和导航栏的夹层放置一个全屏的（透明/半透明）的UIButton，用来监听框外点击

封装此功能，可以作为一个弹出菜单控件

（1）简单尝试直接在窗口上添加一个UIImageView

HVWHomeViewController:

 /** 标题栏按钮点击事件 */

 - (void) titleButtonClickd:(UIButton *) button {

     self.titleButtonExtended = !self.titleButtonExtended;

     if (self.isTitleButtonExtended) {

         [button setImage:[UIImage imageWithNamed:@"navigationbar_arrow_up"] forState:UIControlStateNormal];

         // 弹出框

         UIView *window = [[UIApplication sharedApplication] keyWindow];

         UIImageView *popView = [[UIImageView alloc] init];

         popView.size = CGSizeMake(, );

         popView.centerX = window.width * 0.5;

         popView.y = ;

         popView.image = [UIImage resizedImage:@"popover_background"];

         [self.navigationController.view addSubview:popView];

     } else {

         [button setImage:[UIImage imageWithNamed:@"navigationbar_arrow_down"] forState:UIControlStateNormal];

     }

 }

（2）点击其他区域，隐藏弹出框

使用一个全屏透明/半透明UIButton夹在弹出框和底层的控件之间，监听点击事件

 /** 标题栏按钮点击事件 */

 - (void) titleButtonClickd:(UIButton *) button {

     self.titleButtonExtended = !self.titleButtonExtended;

     if (self.isTitleButtonExtended) {

         [button setImage:[UIImage imageWithNamed:@"navigationbar_arrow_up"] forState:UIControlStateNormal];

         UIView *window = [[UIApplication sharedApplication] keyWindow];

         // 中间辅助覆盖层（帮助隐藏弹出框）

         UIButton *coverLayer = [UIButton buttonWithType:UIButtonTypeCustom];

         coverLayer.frame = window.bounds;

         coverLayer.backgroundColor = [UIColor blackColor];

         coverLayer.alpha = 0.2;

         [window addSubview:coverLayer];

         [coverLayer addTarget:self action:@selector(coverLayerClicked:) forControlEvents:UIControlEventTouchUpInside];

         // 弹出框

         UIImageView *popView = [[UIImageView alloc] init];

         self.popView = popView;

         popView.size = CGSizeMake(, );

         popView.centerX = window.width * 0.5;

         popView.y = ;

         popView.userInteractionEnabled = YES;

         popView.image = [UIImage resizedImage:@"popover_background"];

         [window addSubview:popView];

     } else {

         [button setImage:[UIImage imageWithNamed:@"navigationbar_arrow_down"] forState:UIControlStateNormal];

     }

 }

 /** 辅助覆盖层点击事件 */

 - (void) coverLayerClicked:(UIButton *) button {

     if (self.isTitleButtonExtended) {

         [button removeFromSuperview];

         [self.popView removeFromSuperview];

         [self titleButtonClickd:self.titleButton];

     }

 }

（3）由于弹出框功能可能在多处用到，而且让控制器负责创建不合适，所以封装成一个类

封装成“弹出菜单”类HVWPopMenu（继承UIView）

内部包含：

背景图片

遮盖UIButton

一个内容界面（如tableViewController），作为背景图片的子控件

 //

 //  HVWPopMenu.h

 //  HVWWeibo

 //

 //  Created by hellovoidworld on 15/2/2.

 //  Copyright (c) 2015年 hellovoidworld. All rights reserved.

 //

 #import <UIKit/UIKit.h>

 typedef enum {

     PopMenuArrowLeft,

     PopMenuArrowMid,

     PopMenuArrowRight

 } PopMenuArrow;

 @class HVWPopMenu;

 @protocol HVWPopMenuDelegate <NSObject>

 @optional

 - (void) popMenuDidHideMenu:(HVWPopMenu *) popMenu;

 @end

 @interface HVWPopMenu : UIView

 /** 背景兼内容容器 */

 @property(nonatomic, strong) UIImageView *backgroundContainer;

 #pragma mark - 成员属性

 /** 遮盖夹层 */

 @property(nonatomic, strong) UIButton *coverLayer;

 /** 内容控件 */

 @property(nonatomic, strong) UIView *contentView;

 /** 箭头位置 */

 @property(nonatomic, assign) PopMenuArrow popMenuArrow;

 /** 遮盖夹层透明标识 */

 @property(nonatomic, assign, getter=isDimCoverLayer) BOOL dimCoverLayer;

 /** 代理 */

 @property(nonatomic, weak) id<HVWPopMenuDelegate> delegate;

 #pragma mark - 初始化方法

 - (instancetype) initWithContentView:(UIView *) contentView;

 + (instancetype) popMenuWithContentView:(UIView *) contentView;

 #pragma mark - 使用方法

 /** 弹出 */

 - (void) showMenuInRect:(CGRect) rect;

 /** 隐藏 */

 - (void) hideMenu;

 @end

 //

 //  HVWPopMenu.m

 //  HVWWeibo

 //

 //  Created by hellovoidworld on 15/2/2.

 //  Copyright (c) 2015年 hellovoidworld. All rights reserved.

 //

 #import "HVWPopMenu.h"

 @implementation HVWPopMenu

 #pragma mark - 初始化方法

 - (instancetype) initWithContentView:(UIView *) contentView {

     if (self = [super init]) {

         self.contentView = contentView;

     }

     return self;

 }

 + (instancetype) popMenuWithContentView:(UIView *) contentView {

     return [[self alloc] initWithContentView:contentView];

 }

 /** 初始化子控件 */

 - (instancetype)initWithFrame:(CGRect)frame {

     self = [super initWithFrame:frame];

     if (self) {

         // 中间辅助覆盖层（帮助隐藏弹出框）

         UIButton *coverLayer = [UIButton buttonWithType:UIButtonTypeCustom];

         self.coverLayer = coverLayer;

         [self setDimCoverLayer:YES];

         [coverLayer addTarget:self action:@selector(coverLayerClicked) forControlEvents:UIControlEventTouchUpInside];

         [self addSubview:coverLayer];

         // 添加背景容器

         UIImageView *backgroundContainer = [[UIImageView alloc] init];

         self.backgroundContainer = backgroundContainer;

         backgroundContainer.userInteractionEnabled = YES;

         [self setPopMenuArrow:PopMenuArrowMid];

         [self addSubview:backgroundContainer];

     }

     return self;

 }

 /** 遮盖夹层点击事件 */

 - (void) coverLayerClicked {

     [self hideMenu];

 }

 #pragma mark - 使用方法

 /** 弹出 */

 - (void) showMenuInRect:(CGRect) rect {

     // 准备添加到当前主窗口上

     UIView *window = [[UIApplication sharedApplication] keyWindow];

     self.frame = window.bounds;

     [window addSubview:self];

     self.coverLayer.frame = window.bounds;

     self.backgroundContainer.frame = rect;

     // 添加内容控件

     if (self.contentView) {

         CGFloat topMargin = ;

         CGFloat leftMargin = ;

         CGFloat bottomMargin = ;

         CGFloat rightMargin = ;

         self.contentView.x = leftMargin;

         self.contentView.y = topMargin;

         self.contentView.width = self.backgroundContainer.width - leftMargin - rightMargin;

         self.contentView.height = self.backgroundContainer.height - topMargin - bottomMargin;

         [self.backgroundContainer addSubview:self.contentView];

     }

 }

 /** 隐藏 */

 - (void) hideMenu {

     if ([self.delegate respondsToSelector:@selector(popMenuDidHideMenu:)]) {

         [self.delegate popMenuDidHideMenu:self];

     }

     [self removeFromSuperview];

 }

 #pragma mark - 特性设置

 /** 设置遮盖夹层是否透明 */

 - (void)setDimCoverLayer:(BOOL)dimCoverLayer {

     if (dimCoverLayer) { // 需要半透明模糊效果的

         self.coverLayer.backgroundColor = [UIColor blackColor];

         self.coverLayer.alpha = 0.2;

     } else { // 全透明

         self.coverLayer.backgroundColor = [UIColor clearColor];

         self.coverLayer.alpha = 1.0;

     }

 }

 /** 设置弹出菜单顶部箭头位置：左、中、右 */

 - (void)setPopMenuArrow:(PopMenuArrow)popMenuArrow {

     _popMenuArrow = popMenuArrow;

     switch (popMenuArrow) {

         case PopMenuArrowLeft:

             self.backgroundContainer.image = [UIImage resizedImage:@"popover_background_left"];

             break;

         case PopMenuArrowMid:

             self.backgroundContainer.image = [UIImage resizedImage:@"popover_background"];

             break;

         case PopMenuArrowRight:

             self.backgroundContainer.image = [UIImage resizedImage:@"popover_background_right"];

             break;

         default:

             break;

     }

 }

 @end

 //  HVWHomeViewController.m

 /** 标题栏按钮点击事件 */

 - (void) titleButtonClickd:(UIButton *) button {

     self.titleButtonExtended = !self.titleButtonExtended;

     if (self.isTitleButtonExtended) {

         [button setImage:[UIImage imageWithNamed:@"navigationbar_arrow_up"] forState:UIControlStateNormal];

         // 添加弹出菜单

         UITableView *tableView = [[UITableView alloc] init];

         HVWPopMenu *popMenu = [HVWPopMenu popMenuWithContentView:tableView];

         popMenu.delegate = self;

         popMenu.dimCoverLayer = YES; // 模糊遮盖

         popMenu.popMenuArrow = PopMenuArrowMid; // 中部箭头

         // 弹出

         [popMenu showMenuInRect:CGRectMake(, , , )];

     } else {

         [button setImage:[UIImage imageWithNamed:@"navigationbar_arrow_down"] forState:UIControlStateNormal];

     }

 }

 #pragma mark - HVWPopMenuDelegate

 - (void)popMenuDidHideMenu:(HVWPopMenu *)popMenu {

     UIButton *titleButton = (UIButton *)self.navigationItem.titleView;

     [self titleButtonClickd:titleButton];

 }

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