IOS第二天-新浪微博 - 添加搜索框，弹出下拉菜单 ，代理的使用 ，HWTabBar.h（自定义TabBar）

********HWDiscoverViewController.m（发现）

- (void)viewDidLoad
{
    [super viewDidLoad];

    // 创建搜索框对象
    HWSearchBar *searchBar = [HWSearchBar searchBar];
    searchBar.width = ;
    searchBar.height = ;
    self.navigationItem.titleView = searchBar;  //设置titleView 是搜索框

}

HWSearchBar.m

#import "HWSearchBar.h"

@implementation HWSearchBar

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        self.font = [UIFont systemFontOfSize:];
        self.placeholder = @"请输入搜索条件";          //hit的提示信息
        self.background = [UIImage imageNamed:@"searchbar_textfield_background"];

        // 通过init来创建初始化绝大部分控件，控件都是没有尺寸
        UIImageView *searchIcon = [[UIImageView alloc] init];
        searchIcon.image = [UIImage imageNamed:@"searchbar_textfield_search_icon"];
        searchIcon.width = ;
        searchIcon.height = ;
        searchIcon.contentMode = UIViewContentModeCenter;  //居中
        self.leftView = searchIcon;
        self.leftViewMode = UITextFieldViewModeAlways;
    }
    return self;
}

+ (instancetype)searchBar
{
    return [[self alloc] init];
}

@end

HWSearchBar.h

#import <UIKit/UIKit.h>

@interface HWSearchBar : UITextField
+ (instancetype)searchBar;
@end

**************HWHomeViewController.m(弹出下拉菜单)主页面

#import "HWHomeViewController.h"
#import "HWDropdownMenu.h"
#import "HWTitleMenuViewController.h"

@interface HWHomeViewController () <HWDropdownMenuDelegate>

@end

@implementation HWHomeViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    /* 设置导航栏上面的内容 */
    self.navigationItem.leftBarButtonItem = [UIBarButtonItem itemWithTarget:self action:@selector(friendSearch) image:@"navigationbar_friendsearch" highImage:@"navigationbar_friendsearch_highlighted"];

    self.navigationItem.rightBarButtonItem = [UIBarButtonItem itemWithTarget:self action:@selector(pop) image:@"navigationbar_pop" highImage:@"navigationbar_pop_highlighted"];

    /* 中间的标题按钮 */
//    UIButton *titleButton = [UIButton buttonWithType:UIButtonTypeCustom];
    UIButton *titleButton = [[UIButton alloc] init];
    titleButton.width = ;
    titleButton.height = ;
//    titleButton.backgroundColor = HWRandomColor;

    // 设置图片和文字
    [titleButton setTitle:@"首页" forState:UIControlStateNormal];
    [titleButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    titleButton.titleLabel.font = [UIFont boldSystemFontOfSize:];
    [titleButton setImage:[UIImage imageNamed:@"navigationbar_arrow_down"] forState:UIControlStateNormal];
    [titleButton setImage:[UIImage imageNamed:@"navigationbar_arrow_up"] forState:UIControlStateSelected];
//    titleButton.imageView.backgroundColor = [UIColor redColor];
//    titleButton.titleLabel.backgroundColor = [UIColor blueColor];
    titleButton.imageEdgeInsets = UIEdgeInsetsMake(, , , ); // 距离左边
    titleButton.titleEdgeInsets = UIEdgeInsetsMake(, , , );    // 距离右边

    // 监听标题点击
    [titleButton addTarget:self action:@selector(titleClick:) forControlEvents:UIControlEventTouchUpInside];

    self.navigationItem.titleView = titleButton;
    // 如果图片的某个方向上不规则，比如有突起，那么这个方向就不能拉伸
}

/**
 *  标题点击
 */
- (void)titleClick:(UIButton *)titleButton
{
    // 1.创建下拉菜单
    HWDropdownMenu *menu = [HWDropdownMenu menu];
    menu.delegate = self;

    // 2.设置内容
    HWTitleMenuViewController *vc = [[HWTitleMenuViewController alloc] init];
    vc.view.height = ;
    vc.view.width = ;
    menu.contentController = vc;

    // 3.显示
    [menu showFrom:titleButton];
}

- (void)friendSearch
{
    NSLog(@"friendSearch");
}

- (void)pop
{
    NSLog(@"pop");
}

#pragma mark - HWDropdownMenuDelegate
/**
 *  下拉菜单被销毁了
 */
- (void)dropdownMenuDidDismiss:(HWDropdownMenu *)menu
{
    UIButton *titleButton = (UIButton *)self.navigationItem.titleView;
    titleButton.selected = NO;
    // 让箭头向下
//    [titleButton setImage:[UIImage imageNamed:@"navigationbar_arrow_down"] forState:UIControlStateNormal];
}

/**
 *  下拉菜单显示了
 */
- (void)dropdownMenuDidShow:(HWDropdownMenu *)menu
{
    UIButton *titleButton = (UIButton *)self.navigationItem.titleView;
    titleButton.selected = YES;
    // 让箭头向上
//    [titleButton setImage:[UIImage imageNamed:@"navigationbar_arrow_up"] forState:UIControlStateNormal];
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
#warning Potentially incomplete method implementation.
    // Return the number of sections.
    return ;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
#warning Incomplete method implementation.
    // Return the number of rows in the section.
    return ;
}

@end

********************HWDropdownMenu.m(菜单的view)

#import "HWDropdownMenu.h"
@interface HWDropdownMenu()
/**
 *  将来用来显示具体内容的容器
 */
@property (nonatomic, weak) UIImageView *containerView;
@end

@implementation HWDropdownMenu

- (UIImageView *)containerView
{
    if (!_containerView) {
        // 添加一个灰色图片控件
        UIImageView *containerView = [[UIImageView alloc] init];
        containerView.image = [UIImage imageNamed:@"popover_background"];    //黑色背景图片
        containerView.userInteractionEnabled = YES; // 开启交互
        [self addSubview:containerView];
        self.containerView = containerView;
    }
    return _containerView;
}

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // 清除颜色
        self.backgroundColor = [UIColor clearColor];
    }
    return self;
}

+ (instancetype)menu
{
    return [[self alloc] init];
}

- (void)setContent:(UIView *)content
{
    _content = content;

    // 调整内容的位置
    content.x = ;
    content.y = ;

    // 调整内容的宽度
//    content.width = self.containerView.width - 2 * content.x;

    // 设置灰色的高度
    self.containerView.height = CGRectGetMaxY(content.frame) + ;
    // 设置灰色的宽度
    self.containerView.width = CGRectGetMaxX(content.frame) + ;

    // 添加内容到灰色图片中
    [self.containerView addSubview:content];
}

- (void)setContentController:(UIViewController *)contentController
{
    _contentController = contentController;

    self.content = contentController.view;
}

/**
 *  显示
 */
- (void)showFrom:(UIView *)from
{
    // 1.获得最上面的窗口
    UIWindow *window = [[UIApplication sharedApplication].windows lastObject];

    // 2.添加自己到窗口上
    [window addSubview:self];

    // 3.设置尺寸
    self.frame = window.bounds;

    // 4.调整灰色图片的位置
    // 默认情况下，frame是以父控件左上角为坐标原点
    // 转换坐标系
    CGRect newFrame = [from convertRect:from.bounds toView:window];
//    CGRect newFrame = [from.superview convertRect:from.frame toView:window];
    self.containerView.centerX = CGRectGetMidX(newFrame);
    self.containerView.y = CGRectGetMaxY(newFrame);

    // 通知外界，自己显示了
    if ([self.delegate respondsToSelector:@selector(dropdownMenuDidShow:)]) {
        [self.delegate dropdownMenuDidShow:self];
    }
}

/**
 *  销毁
 */
- (void)dismiss
{
    [self removeFromSuperview];

    // 通知外界，自己被销毁了
    if ([self.delegate respondsToSelector:@selector(dropdownMenuDidDismiss:)]) {
        [self.delegate dropdownMenuDidDismiss:self];
    }
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [self dismiss];
}
@end

HWDropdownMenu.h

#import <UIKit/UIKit.h>

@class HWDropdownMenu;

@protocol HWDropdownMenuDelegate <NSObject>
@optional
- (void)dropdownMenuDidDismiss:(HWDropdownMenu *)menu;
- (void)dropdownMenuDidShow:(HWDropdownMenu *)menu;
@end

@interface HWDropdownMenu : UIView
@property (nonatomic, weak) id<HWDropdownMenuDelegate> delegate;    //代理

+ (instancetype)menu;

/**
 *  显示
 */
- (void)showFrom:(UIView *)from;
/**
 *  销毁
 */
- (void)dismiss;

/**
 *  内容
 */
@property (nonatomic, strong) UIView *content;
/**
 *  内容控制器
 */
@property (nonatomic, strong) UIViewController *contentController;
@end

*********HWTitleMenuViewController //弹出窗体里面的view

#import "HWTitleMenuViewController.h"

@interface HWTitleMenuViewController ()

@end

@implementation HWTitleMenuViewController

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    // Uncomment the following line to preserve selection between presentations.
    // self.clearsSelectionOnViewWillAppear = NO;

    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem;
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Table view data source
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return ;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *ID = @"cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:ID];
    }

    if (indexPath.row == ) {
        cell.textLabel.text = @"好友";
    } else if (indexPath.row == ) {
        cell.textLabel.text = @"密友";
    } else if (indexPath.row == ) {
        cell.textLabel.text = @"全部";
    }

    return cell;
}
@end

**********HWTabBarViewController.m

#import "HWTabBarViewController.h"
#import "HWHomeViewController.h"
#import "HWMessageCenterViewController.h"
#import "HWDiscoverViewController.h"
#import "HWProfileViewController.h"
#import "HWNavigationController.h"
#import "HWTabBar.h"

@interface HWTabBarViewController () <HWTabBarDelegate>

@end

@implementation HWTabBarViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    // 1.初始化子控制器
    HWHomeViewController *home = [[HWHomeViewController alloc] init];
    [self addChildVc:home title:@"首页" image:@"tabbar_home" selectedImage:@"tabbar_home_selected"];

    HWMessageCenterViewController *messageCenter = [[HWMessageCenterViewController alloc] init];
    [self addChildVc:messageCenter title:@"消息" image:@"tabbar_message_center" selectedImage:@"tabbar_message_center_selected"];

    HWDiscoverViewController *discover = [[HWDiscoverViewController alloc] init];
    [self addChildVc:discover title:@"发现" image:@"tabbar_discover" selectedImage:@"tabbar_discover_selected"];

    HWProfileViewController *profile = [[HWProfileViewController alloc] init];
    [self addChildVc:profile title:@"我" image:@"tabbar_profile" selectedImage:@"tabbar_profile_selected"];

    // 2.更换系统自带的tabbar
    //    self.tabBar = [[HWTabBar alloc] init];
    HWTabBar *tabBar = [[HWTabBar alloc] init];
    tabBar.delegate = self;                                                //代理
    [self setValue:tabBar forKeyPath:@"tabBar"];
    //    self.tabBar = tabBar;

//    Person *p = [[Person allooc] init];
//    p.name = @"jack";
//    [p setValue:@"jack" forKeyPath:@"name"];
}

//- (void)viewDidAppear:(BOOL)animated
//{
//    [super viewDidAppear:animated];
//
//    int count = self.tabBar.subviews.count;
//    for (int i = 0; i<count; i++) {
//        UIView *child = self.tabBar.subviews[i];
//        Class class = NSClassFromString(@"UITabBarButton");
//        if ([child isKindOfClass:class]) {
//            child.width = self.tabBar.width / count;
//        }
//    }
//}

/**
 *  添加一个子控制器
 *
 *  @param childVc       子控制器
 *  @param title         标题
 *  @param image         图片
 *  @param selectedImage 选中的图片
 */
- (void)addChildVc:(UIViewController *)childVc title:(NSString *)title image:(NSString *)image selectedImage:(NSString *)selectedImage
{
    // 设置子控制器的文字
    childVc.title = title; // 同时设置tabbar和navigationBar的文字     //两个一起设置
//    childVc.tabBarItem.title = title; // 设置tabbar的文字
//    childVc.navigationItem.title = title; // 设置navigationBar的文字

    // 设置子控制器的图片
    childVc.tabBarItem.image = [UIImage imageNamed:image];
    childVc.tabBarItem.selectedImage = [[UIImage imageNamed:selectedImage]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

    // 设置文字的样式
    NSMutableDictionary *textAttrs = [NSMutableDictionary dictionary];
    textAttrs[NSForegroundColorAttributeName] = HWColor(, , );
    NSMutableDictionary *selectTextAttrs = [NSMutableDictionary dictionary];
    selectTextAttrs[NSForegroundColorAttributeName] = [UIColor orangeColor];
    [childVc.tabBarItem setTitleTextAttributes:textAttrs forState:UIControlStateNormal];  //默认的文字颜色
    [childVc.tabBarItem setTitleTextAttributes:selectTextAttrs forState:UIControlStateSelected];
//    childVc.view.backgroundColor = HWRandomColor;

    // 先给外面传进来的小控制器 包装 一个导航控制器
    HWNavigationController *nav = [[HWNavigationController alloc] initWithRootViewController:childVc];
    // 添加为子控制器
    [self addChildViewController:nav];
}

#pragma mark - HWTabBarDelegate代理方法
- (void)tabBarDidClickPlusButton:(HWTabBar *)tabBar
{
    UIViewController *vc = [[UIViewController alloc] init];
    vc.view.backgroundColor = [UIColor redColor];
    [self presentViewController:vc animated:YES completion:nil];
}

@end

****************HWTabBar.h（自定义TabBar）

#import "HWTabBar.h"

@interface HWTabBar()
@property (nonatomic, weak) UIButton *plusBtn;
@end

@implementation HWTabBar

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // 添加一个按钮到tabbar中
        UIButton *plusBtn = [[UIButton alloc] init];
        [plusBtn setBackgroundImage:[UIImage imageNamed:@"tabbar_compose_button"] forState:UIControlStateNormal];
        [plusBtn setBackgroundImage:[UIImage imageNamed:@"tabbar_compose_button_highlighted"] forState:UIControlStateHighlighted];
        [plusBtn setImage:[UIImage imageNamed:@"tabbar_compose_icon_add"] forState:UIControlStateNormal];
        [plusBtn setImage:[UIImage imageNamed:@"tabbar_compose_icon_add_highlighted"] forState:UIControlStateHighlighted];
        plusBtn.size = plusBtn.currentBackgroundImage.size;
        [plusBtn addTarget:self action:@selector(plusClick) forControlEvents:UIControlEventTouchUpInside];
        [self addSubview:plusBtn];
        self.plusBtn = plusBtn;
    }
    return self;
}

/**
 *  加号按钮点击
 */
- (void)plusClick        //通知代理
{
    // 通知代理
    if ([self.delegate respondsToSelector:@selector(tabBarDidClickPlusButton:)]) {
        [self.delegate tabBarDidClickPlusButton:self];
    }
}

- (void)layoutSubviews
{
#warning [super layoutSubviews] 一定要调用
    [super layoutSubviews];

    // 1.设置加号按钮的位置
    self.plusBtn.centerX = self.width * 0.5;
    self.plusBtn.centerY = self.height * 0.5;

    // 2.设置其他tabbarButton的位置和尺寸
    CGFloat tabbarButtonW = self.width / ;
    CGFloat tabbarButtonIndex = ;
    for (UIView *child in self.subviews) {
        Class class = NSClassFromString(@"UITabBarButton");
        if ([child isKindOfClass:class]) {     //如果是UITabBarButton
            // 设置宽度
            child.width = tabbarButtonW;
            // 设置x
            child.x = tabbarButtonIndex * tabbarButtonW;

            // 增加索引
            tabbarButtonIndex++;
            if (tabbarButtonIndex == ) {
                tabbarButtonIndex++;
            }
        }
    }

//    int count = self.subviews.count;
//    for (int i = 0; i<count; i++) {
//        UIView *child = self.subviews[i];
//        Class class = NSClassFromString(@"UITabBarButton");
//        if ([child isKindOfClass:class]) {
//            // 设置宽度
//            child.width = tabbarButtonW;
//            // 设置x
//            child.x = tabbarButtonIndex * tabbarButtonW;
//
//            // 增加索引
//            tabbarButtonIndex++;
//            if (tabbarButtonIndex == 2) {
//                tabbarButtonIndex++;
//            }
//        }
//    }
}

@end

****************HWTabBar.h（自定义TabBar）

#import <UIKit/UIKit.h>

@class HWTabBar;

#warning 因为HWTabBar继承自UITabBar，所以称为HWTabBar的代理，也必须实现UITabBar的代理协议
@protocol HWTabBarDelegate <UITabBarDelegate>
@optional
- (void)tabBarDidClickPlusButton:(HWTabBar *)tabBar;
@end

@interface HWTabBar : UITabBar
@property (nonatomic, weak) id<HWTabBarDelegate> delegate;
@end