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iOS菜单滚动联动内容区域功能实现

平时开发APP中关于此功能还是比较经常碰到，本实例借用三个开源的插件，并对其中一个进行修改调整实现出想要的效果；本文重点介绍修改的内容跟三个插件的运用，这三个插件还可以各自扩展到其它项目的运用；

效果图：

本实例实现的效果：顶部的滚动菜单显示出所有的类型，每个类型都对应一种展示，可以在顶部的菜单进行滚动，内容区域也会跟着改变，或者是内容区域左右滑动，则顶部的滚动菜单也会跟着更改，顶部菜单的最右边有一个展示更多菜单的效果，用于弹出一个带箭头的窗；( 源代码下载 )

带箭头的弹出视图插件：https://github.com/xiekw2010/DXPopover

内容区域滑动插件：https://github.com/nicklockwood/iCarousel

及Codint.Net开源项目中的XTSegmentControl菜单滚动效果，此实例对它进行的修改

1：插件及页面的初始化

#import "ViewController.h" #import "oldChildVewController.h" #import "ChildViewController.h" #import "newChildVewController.h" #import "XTSegmentControl.h" #import "iCarousel.h" #import "Masonry.h" #import "menuCollectionViewCell.h" #import "DXPopover.h" #define kScreen_Height [UIScreen mainScreen].bounds.size.height #define kScreen_Width [UIScreen mainScreen].bounds.size.width #define kMySegmentControl_Height 44.0 @interface ViewController ()<UICollectionViewDataSource, UICollectionViewDelegate,iCarouselDataSource, iCarouselDelegate> @property (strong, nonatomic) XTSegmentControl *mySegmentControl; @property (strong, nonatomic) NSArray *titlesArray; @property (strong, nonatomic) iCarousel *myCarousel; @property(assign,nonatomic)NSInteger curSelectIndex; @property (nonatomic, strong) DXPopover *popover; @property(assign,nonatomic)CGFloat popoverWidth; @property (strong, nonatomic) UICollectionView *myCollectionView; @end @implementation ViewController - (void)viewDidLoad {  [super viewDidLoad];  self.view.backgroundColor=[UIColor whiteColor];  //初始化一个popover 用于弹窗效果的展示  self.popover = [DXPopover new];  _popoverWidth = kScreen_Width-20;  __weak typeof(self) weakSelf = self;  CGRect frame=self.view.bounds;  //内容区滚动效果插件  self.myCarousel = ({   iCarousel *icarousel = [[iCarousel alloc] initWithFrame:frame];   icarousel.dataSource = self;   icarousel.delegate = self;   icarousel.decelerationRate = 1.0;   icarousel.scrollSpeed = 1.0;   icarousel.type = iCarouselTypeLinear;   icarousel.pagingEnabled = YES;   icarousel.clipsToBounds = YES;   icarousel.bounceDistance = 0.2;   [self.view addSubview:icarousel];   [icarousel mas_makeConstraints:^(MASConstraintMaker *make) {    make.edges.equalTo(self.view).insets(UIEdgeInsetsMake(64, 0, 0, 0));   }];   icarousel;  });  //添加滑块  __weak typeof(_myCarousel) weakCarousel = _myCarousel;  self.mySegmentControl = [[XTSegmentControl alloc] initWithFrame:CGRectMake(0, 20, kScreen_Width, 44) Items:self.titlesArray showRightButton:YES selectedBlock:^(NSInteger index) {   weakSelf.curSelectIndex=index;   weakCarousel.currentItemIndex=index;   [weakSelf.myCollectionView reloadData];  }];  //当有右边键时 其响应的事件  self.mySegmentControl.rightButtonBlock= ^(CGRect rightButtomRect)  {   //弹出插件的运用   [weakSelf updateMyViewFrame];   CGPoint startPoint =   CGPointMake(CGRectGetMidX(rightButtomRect), CGRectGetMaxY(rightButtomRect) + 25);   [weakSelf.popover showAtPoint:startPoint        popoverPostion:DXPopoverPositionDown       withContentView:weakSelf.myCollectionView          inView:weakSelf.view];  };  [self.view addSubview:self.mySegmentControl];  //用于展示弹出效果里面的列表  if (!_myCollectionView) {   UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];   self.myCollectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0,50,kScreen_Width-40, 200) collectionViewLayout:layout];   self.myCollectionView.backgroundColor=[UIColor whiteColor];   self.myCollectionView.showsHorizontalScrollIndicator=NO;   self.myCollectionView.showsVerticalScrollIndicator=NO;   [self.myCollectionView registerClass:[menuCollectionViewCell class] forCellWithReuseIdentifier:NSStringFromClass([menuCollectionViewCell class])];   self.myCollectionView.dataSource = self;   self.myCollectionView.delegate = self;  } }

其中 XTSegmentControl为顶部菜单的创建，其中 showRightButton是为了扩展是否显示右边更多菜单的事件，并把事件的响应Block到页面进行实现，此事例就是响应弹出窗的效果展现， iCarousel为内容区域的滑动效果， DXPopover弹出窗的效果， UICollectionView则用于弹出窗里面的菜单列表

//popver一些属性的设置 -(void)updateMyViewFrame {  CGRect tableViewFrame = self.myCollectionView.frame;  tableViewFrame.size.width = _popoverWidth;  self.myCollectionView.frame = tableViewFrame;  self.popover.contentInset = UIEdgeInsetsZero;  self.popover.backgroundColor = [UIColor whiteColor]; } #pragma mark - Getter/Setter - (NSArray*)titlesArray {  if (nil == _titlesArray) {    _titlesArray = @[@"全部", @"互动", @"开源控件", @"文档", @"代码", @"高尔夫",@"主题",@"软件",@"股票"];  }  return _titlesArray; }

2插件 iCarouselDataSource , iCarouselDelegate代码实现

#pragma mark iCarousel M - (NSUInteger)numberOfItemsInCarousel:(iCarousel *)carousel{  return [self.titlesArray count]; } //滚动时内容视图的加载 - (UIView *)carousel:(iCarousel *)carousel viewForItemAtIndex:(NSUInteger)index reusingView:(UIView *)view{  [_mySegmentControl setScrollOffset:index];  UIViewController *childContrll=[[ChildViewController alloc]init];  UIView *my=childContrll.view;  switch (index) {   case 0:   {    my.backgroundColor=[UIColor blackColor];    break;   }   case 1:   {    my.backgroundColor=[UIColor redColor];    break;   }   default:    childContrll=[[newChildVewController alloc]init];    break;  }  return childContrll.view; } //滚动时 下划线的位置更新 - (void)carouselDidScroll:(iCarousel *)carousel{  if (_mySegmentControl) {   [_mySegmentControl moveIndexWithProgress];  } } //更新滚动其它两个控件的位置 - (void)carouselCurrentItemIndexDidChange:(iCarousel *)carousel{  self.curSelectIndex=carousel.currentItemIndex;  [self.myCollectionView reloadData];  if (_mySegmentControl) {   _mySegmentControl.currentIndex = carousel.currentItemIndex;  } }

注意：内容区域的视图加载，及其滑动所响应的事件处理，原来的 XTSegmentControl对于菜单字数不同时下划线会出现一些异常，本实例对它进行修改了；

3：列表 UICollectionViewDataSource, UICollectionViewDelegate功能的实现

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{  return self.titlesArray.count; } - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{  menuCollectionViewCell *ccell = [collectionView dequeueReusableCellWithReuseIdentifier:NSStringFromClass([menuCollectionViewCell class]) forIndexPath:indexPath];  NSString *model=[self.titlesArray objectAtIndex:indexPath.row];  ccell.curMenuModel=model;  if (self.curSelectIndex==indexPath.row) {   ccell.backgroundColor=[UIColor blueColor];  }  else  {   ccell.backgroundColor=[UIColor whiteColor];  }  return ccell; } - (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{  return CGSizeMake((kScreen_Width-40)/3, 40); } - (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section{  return UIEdgeInsetsZero; } - (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section{  return 5; } - (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section{  return 5; } - (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{  self.curSelectIndex=indexPath.row;  //两个滚动的位置更新  _myCarousel.currentItemIndex=self.curSelectIndex;  [_mySegmentControl selectIndex:self.curSelectIndex];  //隐藏弹出窗  [self.popover dismiss]; }

注意：主要是在实现点击时滚动位置跟内容的区域要进行调整，并把弹出窗进行收缩的操作；

4： XTSegmentControl下划线调整

- (void)moveIndexWithProgress {  CGRect origionRect = [_itemFrames[_currentIndex] CGRectValue];  CGRect origionLineRect = CGRectMake(CGRectGetMinX(origionRect) + XTSegmentControlHspace, CGRectGetHeight(origionRect) - XTSegmentControlLineHeight, CGRectGetWidth(origionRect) - 2 * XTSegmentControlHspace, XTSegmentControlLineHeight);  //增加下划线滚动的效果  [UIView animateWithDuration:0.5 animations:^{   _lineView.frame = origionLineRect;  } completion:^(BOOL finished) {  }]; }

5：扩展XTSegmentControl没有右边更多菜单的效果

self.mySegmentControl = [[XTSegmentControl alloc] initWithFrame:CGRectMake(0, 20, kScreen_Width, 44) Items:self.titlesArray showRightButton:NO selectedBlock:^(NSInteger index) {         weakSelf.curSelectIndex=index;         weakCarousel.currentItemIndex=index;         [weakSelf.myCollectionView reloadData];     }];

效果图：