}else{
return _dataArray[index-1];
}
}
//翻页控制器进行向后翻页动作 这个数据源方法返回的视图控制器为要显示视图的视图控制器
- (nullable UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController{
int index = (int)[_dataArray indexOfObject:viewController];
if (index==9) {
return nil;
}else{
if (_dataArray.count-1>=(index+1)) {
return _dataArray[index+1];
}else{
ModelViewController * model = [ModelViewController creatWithIndex:index+2];
[_dataArray addObject:model];
return model;
}
}
}
//屏幕旋转触发的代理方法
- (UIPageViewControllerSpineLocation) pageViewController:(UIPageViewController *)pageViewController spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation{
return UIPageViewControllerSpineLocationMin;
}
//设置分页控制器的分页数
- (NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController {
return 10;
}
//设置初始的分页点
- (NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController{
return 0;
}
@end
上面创建了最简单的翻页视图控制器示例，效果如下图：
三、UIPageViewController中方法使用解析
//创建翻页视图控制器对象
- (instancetype)initWithTransitionStyle:(UIPageViewControllerTransitionStyle)style navigationOrientation:(UIPageViewControllerNavigationOrientation)navigationOrientation options:(nullable NSDictionary<NSString *, id> *)options;
上面方法用于创建视图控制器对象，其中UIPageViewControllerTransitionStyle参数设置翻页控制器的风格，枚举如下：
typedef NS_ENUM(NSInteger, UIPageViewControllerTransitionStyle) {
UIPageViewControllerTransitionStylePageCurl = 0, //类似于书本翻页效果
UIPageViewControllerTransitionStyleScroll = 1 // 类似于ScrollView的滑动效果
