iOS開發之多視圖滑動點擊切換實現

下面這個視圖(多視圖滑動點擊切換)在很多App都有用到.使用封裝過的view,外部調用一個API就可以實現，十分的方便。

git代碼:https://github.com/HelloYeah/HYTabbarView.

//添加一個子控制器
 

代碼如下	複製代碼
-(void)addSubItemWithViewController:(UIViewController *)viewController;

 
1.外部傳一個控制器

代碼如下	複製代碼
-(void)addSubItemWithViewController:(UIViewController *)viewController{     UIButton*btn=[UIButtonbuttonWithType:UIButtonTypeCustom];   [self.tabbar addSubview:btn]; [self setupBtn:btnwithTitle:viewController.title];   [btn addTarget:self action:@selector(itemSelected:)forControlEvents:UIControlEventTouchUpInside];   [self.subViewControllers addObject:viewController]; }

 
2.KVO監聽當前選中View的序號值

代碼如下

複製代碼

NSInteger  min = HYColumn  / 2 ; if (_selectedIndex = self.titles.count - min) {     UIButton * tempBtn = self.titles[self.titles.count - min - 1];     CGFloat btnX = (HYColumn % 2 ) ? tempBtn.center.x : (tempBtn.center.x + btn.frame.size.width * 0.5) ;     CGFloat offsetX = _tabbar.center.x - btnX;     [UIView animateWithDuration:0.25 animations:^{       _tabbar.contentOffset = CGPointMake(- offsetX, 0);     }];     }else if (_selectedIndex > min && _selectedIndex < self.titles.count - min && self.titles.count > HYColumn ) {        CGFloat btnX  = (HYColumn % 2 ) ? btn.center.x : (btn.center.x - btn.frame.size.width * 0.5) ;        CGFloat offsetX = _tabbar.center.x - btnX;        [UIView animateWithDuration:0.25 animations:^{          _tabbar.contentOffset = CGPointMake( - offsetX, 0);            }];     } else {        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];     } }