iOS UI代码片段-UIPageViewController的使用

使用UIPageViewController作为容器，可以盛装多个ViewController，高效实现可以左右／上下滑动切换不同流。

代码片段：

遵守

UIPageViewControllerDataSource,

UIPageViewControllerDelegate,

协议

创建pageViewController对象：

//创建底部的pageViewController
- (void)createPageViewControlelr{
    //创建pageView视图,作为整个滑动视图控制器
    //创建配置
    NSDictionary * dic = [NSDictionary dictionaryWithObject:[NSNumber numberWithInteger:UIPageViewControllerSpineLocationMin] forKey:UIPageViewControllerOptionSpineLocationKey];
    //创建pageController对象;并且只允许左右滑动
    self.downPageViewController = [[UIPageViewController alloc]initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:dic];
    self.downPageViewController.automaticallyAdjustsScrollViewInsets = NO;
    //设置背景颜色
    self.downPageViewController.view.backgroundColor = [UIColor whiteColor];
    //设置pageViewController的view的frame；
    [self.downPageViewController.view setFrame:CGRectMake(0, 0,mScreenWidth,mScreenHeight)];
    //设置代理
    self.downPageViewController.delegate = self;
    self.downPageViewController.dataSource = self;
    //持有pageViewController，并且展示view
    //[self.view addSubview:self.downPageViewController.view];
    //[self addChildViewController:self.downPageViewController];
    [self presentViewController:self.downPageViewController animation:NO complate:NULL];
    self.downPageViewController.view.backgroundColor = [UIColor colorWithRGBHexString:@"#EFEFF4"];
}

实现代理方法：

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController{
    NSInteger index = [self indexOfCardViewController:(UIViewController *)viewController];
    //准备前面一页
    return [self cardViewControllerWithIndex:index - 1];
}


- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController{
    NSInteger index = [self indexOfCardViewController:(UIViewController *)viewController];
    //准备后面一页
    return [self cardViewControllerWithIndex:index + 1];
}

- (void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray<UIViewController *> *)previousViewControllers transitionCompleted:(BOOL)completed{
    NSInteger index = [self indexOfCardViewController:pageViewController.viewControllers[0]];
    //滑动切换了流
}

//pageViewController代理辅助方法
- (UIViewController *)cardViewControllerWithIndex:(NSInteger)index{
    //如果越界，不要取
    if (index >= 0 && index < self.cardContentViewControllers.count) {
        return self.cardContentViewControllers[index];
    }
    return nil;
}

//获取对应的位置
- (NSInteger)indexOfCardViewController:(UIViewController *)cardViewController{
    return [self.cardContentViewControllers indexOfObject:cardViewController];
}

这里面有个大坑，i don't say.