Second Chapter

創(chuàng)建程序的主架構(gòu)

• 大多數(shù)一般都使用tabBarController嵌套著navgationCotroller,系統(tǒng)默認(rèn)的tabBarItem如果不是我們需要的,要想修改,可以統(tǒng)一通過(guò)UIAppearance來(lái)設(shè)置.
• 只要方法名或者屬性名后面帶有UI_APPEARANCE_SELECTOR這個(gè)宏，就可以通過(guò)[XXX appearance]對(duì)象來(lái)統(tǒng)一設(shè)置

//設(shè)置普通狀態(tài)文字的狀態(tài)
    
    NSMutableDictionary *normalAtts = [NSMutableDictionary dictionary];
    normalAtts[NSForegroundColorAttributeName] = [UIColor grayColor];
    normalAtts[NSFontAttributeName] = [UIFont systemFontOfSize:14];

    //設(shè)置選中狀態(tài)文字的狀態(tài)
    NSMutableDictionary *SelectedAtts = [NSMutableDictionary dictionary];
    SelectedAtts[NSForegroundColorAttributeName] = [UIColor darkGrayColor];
    SelectedAtts[NSFontAttributeName] = [UIFont systemFontOfSize:14];
    
    UITabBarItem *item = [UITabBarItem appearance];
    [item setTitleTextAttributes:normalAtts forState:UIControlStateNormal];
    [item setTitleTextAttributes:SelectedAtts forState:UIControlStateSelected];
    

• 添加子控制器

- (void)setupAllChildVc{
    
    [self setupChildVc:[[CqNavigationViewController alloc] initWithRootViewController:[[CqEssenceViewController alloc] init]] title:@"" imageName:@"" selectedImage:@""];

    [self setupChildVc:[[CqNavigationViewController alloc] initWithRootViewController:[[CqNewViewController alloc] init] ] title:@"" imageName:@"" selectedImage:@""];
    

    
    [self setupChildVc:[[CqNavigationViewController alloc] initWithRootViewController:[[CqFocusViewController alloc] init] ] title:@"" imageName:@"" selectedImage:@""];
    
    
    
    [self setupChildVc:[[CqNavigationViewController alloc] initWithRootViewController:[[CqMeViewController alloc] init] ]title:@"我" imageName:@"" selectedImage:@""];
}



/**
 *  初始化一個(gè)子控制器
 *
 *  @param childVcClass  子控制器的具體類型
 *  @param title         子控制器的標(biāo)題
 *  @param image         子控制器的圖標(biāo)
 *  @param selectedImage 子控制器的選中圖標(biāo)
 */
- (void)setupChildVc:(UIViewController *)childVc title:(NSString *)title imageName:(NSString *)imageName selectedImage:(NSString *)selectedImage
{
//    childVc.view.backgroundColor = CqRandomColor;
    childVc.tabBarItem.title = title;
    if (imageName.length) {
        
        childVc.tabBarItem.image = [UIImage imageNamed:imageName];
    }
    if (selectedImage) {
        
        childVc.tabBarItem.selectedImage = [UIImage imageNamed:selectedImage];
    }
    [self addChildViewController:childVc];
    
    
}

• 如果系統(tǒng)的tabBar不能滿足需求,可以自己創(chuàng)建自己的tabBar系統(tǒng)的tabBar,根據(jù)用戶添加了多少自控制器來(lái)決定,點(diǎn)擊切換,如果單純?cè)趖abBar添加一個(gè)按鈕,系統(tǒng)的tabBar就不足以讓我們?nèi)ナ褂昧?這就需要我們自己去自定義了.

• 為tabBar添加按鈕有兩種方法

• 多添加一個(gè)自控制器,給后來(lái)添加的按鈕留下位置,在添加一個(gè)按鈕覆蓋到添加空的子控制器留的tabBar位置上,這種方法可以實(shí)現(xiàn)我們的需求,但是,會(huì)浪費(fèi)了一個(gè)控制器,直接創(chuàng)建出來(lái)什么,沒(méi)有多大的用處.

• 另外一種是重新布局tabBar內(nèi)部的排列,一般tabBar是根據(jù)子控制的個(gè)數(shù),將tabBar寬度平均分成自控制器的個(gè)數(shù),我們可以通過(guò)修改每個(gè)自控制器在tabBar現(xiàn)實(shí)的位置進(jìn)行重新分布,為了避免重復(fù)添加按鈕,可以對(duì)按鈕執(zhí)行懶加載.

• 例如自定義tabBar

- (UIButton *)publishBtn{
    if (!_publishBtn) {
        UIButton *btn = [[UIButton alloc] init];
        [btn setImage:[UIImage imageNamed:@"tabBar_publish_icon"] forState:UIControlStateNormal];
        [btn setImage:[UIImage imageNamed:@"tabBar_publish_click_icon"] forState:UIControlStateHighlighted];
        [self addSubview:btn];
        
        [btn addTarget:self action:@selector(publishBtnClick) forControlEvents:UIControlEventTouchUpInside];
        
        _publishBtn = btn;
        
        
    }
    
    return _publishBtn;
}

- (void)layoutSubviews{
    
    [super layoutSubviews];
    
    /** 按鈕的尺寸 **/
    CGFloat tabButtonW = self.Cq_width * 0.2;
    CGFloat tabButtonH = self.Cq_height;
    
    /** 設(shè)置publishButton的frame **/
    self.publishBtn.Cq_width= tabButtonW;
    self.publishBtn.Cq_height = tabButtonH;
    self.publishBtn.center = CGPointMake(self.Cq_width * 0.5, self.Cq_height * 0.5);
    
    //用來(lái)記錄的索引
    int tabBarIndex = 0;
  
    for (UIControl *tabBarButton in self.subviews) {
        //如果不是系統(tǒng)UItabBarButton的,跳過(guò)
        if (![@"UITabBarButton" isEqualToString:NSStringFromClass(tabBarButton.class)] ){
            continue;
        }
        //布局tabBar子控件的位置
        tabBarButton.Cq_width = tabButtonW;
        tabBarButton.Cq_height = tabButtonH;
        tabBarButton.Cq_y = 0;
        tabBarButton.Cq_x = tabBarIndex * tabButtonW;
        if (tabBarIndex >= 2) {
            tabBarButton.Cq_x += tabButtonW;
        }
        //記錄點(diǎn)擊的tabBarButton
        tabBarButton.tag = tabBarIndex;

        //增加索引
        tabBarIndex++;
        
        //為了之后監(jiān)聽tabBar點(diǎn)擊每個(gè)頁(yè)面的切換,
        [tabBarButton addTarget:self action:@selector(tabBarButtonClick:) forControlEvents:UIControlEventTouchUpInside];
    }
}

#pragma mark - 監(jiān)聽點(diǎn)擊

- (void)tabBarButtonClick:(UIControl *)tabBarButton{
    
    if (self.selectBtnIndex == tabBarButton.tag) {
        //發(fā)通知
        [[NSNotificationCenter defaultCenter] postNotificationName:CqTabBarButtonDidRepeatClickNotification object:nil];
    }
    
    //記錄索引
    self.selectBtnIndex = tabBarButton.tag;
    
}