iOS15 UIPageViewController的使用

主要源码

//
//  ViewController.m
//  UIPageViewControllerDemo
//
//  Created by SHB on 16/4/12.
//  Copyright © 2016年 Herb. All rights reserved.
//

#import "ViewController.h"
#import "ContentViewController.h"

@interface ViewController () <UIPageViewControllerDelegate, UIPageViewControllerDataSource>

@property (nonatomic, strong) UIPageViewController *pageViewController;
@property (nonatomic, strong) NSArray *pageContentArray;

@end

@implementation ViewController

#pragma mark - Lazy Load

- (NSArray *)pageContentArray {
    if (!_pageContentArray) {
        NSMutableArray *arrayM = [[NSMutableArray alloc] init];
        for (int i = 1; i < 10; i++) {
            NSString *contentString = [[NSString alloc] initWithFormat:@"This is the page %d of content displayed using UIPageViewController", i];
            [arrayM addObject:contentString];
        }
        _pageContentArray = [[NSArray alloc] initWithArray:arrayM];

    }
    return _pageContentArray;
}

#pragma mark - Life Cycle

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // 设置UIPageViewController的配置项
    NSDictionary *options = @{UIPageViewControllerOptionInterPageSpacingKey : @(0)};
//    NSDictionary *options = @{UIPageViewControllerOptionSpineLocationKey : @(UIPageViewControllerSpineLocationMin)};

    // 根据给定的属性实例化UIPageViewController
    _pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll
                                                          navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal
                                                                        options:options];
    // 设置UIPageViewController代理和数据源
    _pageViewController.delegate = self;
    _pageViewController.dataSource = self;
    
    // 让UIPageViewController对象，显示相应的页数据。
    // UIPageViewController对象要显示的页数据封装成为一个NSArray。
    // 因为我们定义UIPageViewController对象显示样式为显示一页（options参数指定）。
    // 如果要显示2页，NSArray中，应该有2个相应页数据。
    
    // 设置UIPageViewController初始化数据, 将数据放在NSArray里面
    // 如果 options 设置了 UIPageViewControllerSpineLocationMid,注意viewControllers至少包含两个数据,且 doubleSided = YES
    
    ContentViewController *initialViewController = [self viewControllerAtIndex:0];// 得到第一页
    NSArray *viewControllers = [NSArray arrayWithObject:initialViewController];
    NSLog(@" LJUN %ld",viewControllers.count);
    [_pageViewController setViewControllers:viewControllers
                              direction:UIPageViewControllerNavigationDirectionReverse
                               animated:NO
                             completion:nil];

    // 设置UIPageViewController 尺寸
//    _pageViewController.view.frame = self.view.bounds;
    _pageViewController.view.frame = CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, 400);
    // 在页面上，显示UIPageViewController对象的View
//    [self addChildViewController:_pageViewController];
    [self.view addSubview:_pageViewController.view];

}

#pragma mark - UIPageViewControllerDataSource And UIPageViewControllerDelegate

#pragma mark 返回上一个ViewController对象

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController {
    
    NSUInteger index = [self indexOfViewController:(ContentViewController *)viewController];
    if ((index == 0) || (index == NSNotFound)) {
        return nil;
    }
    index--;
    // 返回的ViewController，将被添加到相应的UIPageViewController对象上。
    // UIPageViewController对象会根据UIPageViewControllerDataSource协议方法,自动来维护次序
    // 不用我们去操心每个ViewController的顺序问题
    return [self viewControllerAtIndex:index];
    
    
}

#pragma mark 返回下一个ViewController对象

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController {
    
    NSUInteger index = [self indexOfViewController:(ContentViewController *)viewController];
    if (index == NSNotFound) {
        return nil;
    }
    index++;
    if (index == [self.pageContentArray count]) {
        return nil;
    }
    return [self viewControllerAtIndex:index];
    
    
}

//- (NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController {
//    return self.pageContentArray.count;
//}
//
//- (NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController {
//    return 8;
//}


#pragma mark - 根据index得到对应的UIViewController

- (ContentViewController *)viewControllerAtIndex:(NSUInteger)index {
    if (([self.pageContentArray count] == 0) || (index >= [self.pageContentArray count])) {
        return nil;
    }
    // 创建一个新的控制器类，并且分配给相应的数据
    ContentViewController *contentVC = [[ContentViewController alloc] init];
    contentVC.content = [self.pageContentArray objectAtIndex:index];
    return contentVC;
}

#pragma mark - 数组元素值，得到下标值

- (NSUInteger)indexOfViewController:(ContentViewController *)viewController {
    return [self.pageContentArray indexOfObject:viewController.content];
}

@end

标签：index,iOS15,UIPageViewController,self,pageContentArray,使用,pageViewController,ret
来源： https://www.cnblogs.com/Johnson-Swift/p/15858840.html