#import "ViewController.h"http:/// 當(dāng)前controller
#import "MyViewController.h" /// 復(fù)用的controller 適用于每個(gè)控制器布局相同的情況下，，布局不同就創(chuàng)建不同的controller添加進(jìn)來(lái)
#import "TitleCollectionViewCell.h"http:/// 標(biāo)題欄使用的collectionviewcell

@interface ViewController ()<UIPageViewControllerDelegate,UIPageViewControllerDataSource,UICollectionViewDelegate,UICollectionViewDataSource>{

 //// 記錄當(dāng)前頁(yè) 當(dāng)前標(biāo)題位置

 NSInteger ld_currentIndex;

}

@property (nonatomic, strong) UIPageViewController *pageViewController;
@property (nonatomic, strong) NSMutableArray *controllersArr;/// 控制器數(shù)組
@property (nonatomic, strong) NSMutableArray *titleArray; /// 標(biāo)題數(shù)組
@property (nonatomic, strong) UICollectionView *titleCollectionView; /// 標(biāo)題collectionview

@end

@implementation ViewController


- (void)viewDidLoad {
 [super viewDidLoad];
 self.view.backgroundColor = [UIColor whiteColor];
 self.navigationController.navigationBar.translucent = NO;
 self.controllersArr = [NSMutableArray array];
 self.titleArray = [NSMutableArray array];
 //// 如果controller布局相同則循環(huán)創(chuàng)建MyViewController 添加進(jìn)數(shù)組，，如果controller 布局不同 那就創(chuàng)建多個(gè)不同controller依次添加數(shù)組
 for (int i = 0; i < 10; i++) {
 MyViewController *con = [[MyViewController alloc]init];
 [self.controllersArr addObject:con];
 NSString *str = [NSString stringWithFormat:@"第 %d 頁(yè)", i+1];
 con.titlestring = str;
 [self.titleArray addObject:str];

 }
 [self createCollectionView];
 [self createPageViewController];
 [self setTheFirstPage];

}



/// 創(chuàng)建標(biāo)題collectionview
- (void)createCollectionView{
 UICollectionViewFlowLayout *lay = [[UICollectionViewFlowLayout alloc] init];
 lay.itemSize = CGSizeMake(60, 30);
 lay.minimumLineSpacing = 0;
 lay.minimumInteritemSpacing = 0;
 lay.scrollDirection = UICollectionViewScrollDirectionHorizontal;
 self.titleCollectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, 34, 375, 30) collectionViewLayout:lay];
 self.titleCollectionView.showsHorizontalScrollIndicator = NO;
 self.titleCollectionView.backgroundColor = [UIColor whiteColor];
 self.titleCollectionView.delegate = self;
 self.titleCollectionView.dataSource = self;
 [self.titleCollectionView registerClass:[TitleCollectionViewCell class] forCellWithReuseIdentifier:@"titleReuse"];
 [self.navigationController.view addSubview:self.titleCollectionView];


}

//// 標(biāo)題collectionview的協(xié)議方法

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
 return self.titleArray.count;

}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
 TitleCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"titleReuse" forIndexPath:indexPath];
 cell.titleLabel.text = self.titleArray[indexPath.row];
 if (indexPath.row == ld_currentIndex) {
 cell.titleLabel.textColor = [UIColor orangeColor];

 }else{

 cell.titleLabel.textColor = [UIColor blackColor];

 }

 return cell;

}

//// 點(diǎn)擊標(biāo)題左右切換視圖控制器------------再也不用看到好幾個(gè)中間頁(yè)面從屏幕快速閃過(guò)了------
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{
 UIViewController *vc = [self.controllersArr objectAtIndex:indexPath.row];
 if (indexPath.row > ld_currentIndex) {
 [self.pageViewController setViewControllers:@[vc] direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:^(BOOL finished) {

 }];

 } else {

 [self.pageViewController setViewControllers:@[vc] direction:UIPageViewControllerNavigationDirectionReverse animated:YES completion:^(BOOL finished) {

 }];

 }
 ld_currentIndex = indexPath.row;
 NSIndexPath *path = [NSIndexPath indexPathForRow:ld_currentIndex inSection:0];
 [self.titleCollectionView scrollToItemAtIndexPath:path atScrollPosition:UICollectionViewScrollPositionCenteredHorizontally animated:YES];
 [self.titleCollectionView reloadData];

}



/// 創(chuàng)建pageViewController
- (void)createPageViewController {
 NSDictionary *option = [NSDictionary dictionaryWithObject:[NSNumber numberWithInteger:0] forKey:UIPageViewControllerOptionInterPageSpacingKey];
 _pageViewController = [[UIPageViewController alloc]initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:option];
 _pageViewController.delegate = self;
 _pageViewController.dataSource = self;
 [self addChildViewController:_pageViewController];
 [self.view addSubview:_pageViewController.view];

}

/// 展示上一頁(yè)
- (nullable UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController {
 NSInteger index = [self.controllersArr indexOfObject:viewController];
 if (index == 0 || (index == NSNotFound)) {
 return nil;

 }

 index--;
 return [self.controllersArr objectAtIndex:index];

}

/// 展示下一頁(yè)
- (nullable UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController {
 NSInteger index = [self.controllersArr indexOfObject:viewController];
 if (index == self.controllersArr.count - 1 || (index == NSNotFound)) {
 return nil;

 }

 index++;
 return [self.controllersArr objectAtIndex:index];

}

/// 將要滑動(dòng)切換的時(shí)候
- (void)pageViewController:(UIPageViewController *)pageViewController willTransitionToViewControllers:(NSArray<UIViewController *> *)pendingViewControllers {
 UIViewController *nextVC = [pendingViewControllers firstObject];
 NSInteger index = [self.controllersArr indexOfObject:nextVC];
 ld_currentIndex = index;

}

/// 滑動(dòng)結(jié)束后
- (void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray<UIViewController *> *)previousViewControllers transitionCompleted:(BOOL)completed {
 if (completed) {
 NSIndexPath *path = [NSIndexPath indexPathForRow:ld_currentIndex inSection:0];
 [self.titleCollectionView scrollToItemAtIndexPath:path atScrollPosition:UICollectionViewScrollPositionCenteredHorizontally animated:YES];
 [self.titleCollectionView reloadData];

 NSLog(@">>>>>>>>> %ld", (long)ld_currentIndex);

 } 

}

/// 設(shè)置默認(rèn)顯示的是哪個(gè)頁(yè)面（controller）
- (void)setTheFirstPage{
 UIViewController *vc = [self.controllersArr objectAtIndex:ld_currentIndex];
 [self.pageViewController setViewControllers:@[vc] direction:UIPageViewControllerNavigationDirectionReverse animated:YES completion:nil];

}

- (void)didReceiveMemoryWarning {
 [super didReceiveMemoryWarning];
 // Dispose of any resources that can be recreated.

}

TitleCollectionViewCell
@implementation TitleCollectionViewCell


- (instancetype)initWithFrame:(CGRect)frame{
 self = [super initWithFrame:frame];
 if (self) {
 [self createView];

 }
 return self;

}

- (void)createView{
 self.titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, self.contentView.frame.size.width, self.contentView.frame.size.height)];
 [self.contentView addSubview:self.titleLabel];
 self.titleLabel.font = [UIFont systemFontOfSize:14];

}
@end