标签segmentControl分页显示--->使用UICollectionView

背景交待

项目中好多时候都会用到标签栏,网易新闻/内涵段子/百思不得姐....等等.
IMG_0364.PNG 代码部分
首先定义一个 VIew 把标签栏封装起来,方便以后的使用.
定义一个 View : SegmentControlView.h 中
@property (copy, nonatomic) NSArray *titleArray; // 存放标签的数组 @property (nonatomic, copy) void(^IndexChangeBlock )(NSInteger index); // 定义一个 block 监听点击 进行回传 /** 设置选中第几个*/ - (void)setSelectedSegmentIndex:(NSUInteger)index animated:(BOOL)animated ;

SegmentControlView.m 中
把一个 CollectionView 写成成员变量,
@property (strong, nonatomic) UICollectionView *titleCollectionView;

init中
- (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init]; flowLayout.minimumInteritemSpacing = 0; flowLayout.minimumLineSpacing = 0; flowLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal; self.titleCollectionView = [[UICollectionViewalloc] initWithFrame:CGRectMake(0, 0, self.bounds.size.width, self.bounds.size.height) collectionViewLayout:flowLayout]; [self.titleCollectionView registerNib:[UINib nibWithNibName:@"SegmentCollectionViewCell" bundle:nil] forCellWithReuseIdentifier:reuseIdentifier]; self.titleCollectionView.delegate = self; self.titleCollectionView.dataSource = self; self.titleCollectionView.bounces = NO; self.titleCollectionView.backgroundColor = [UIColor colorWithHexString:NavColorHexString]; self.titleCollectionView.showsHorizontalScrollIndicator = NO; [self addSubview:self.titleCollectionView]; } return self; }

实现代理-数据源方法
// 懒加载数据源 -(NSArray *)titleArray { if (!_titleArray) { self.titleArray = [NSArrayarray]; } return _titleArray; }- (void)setSelectedSegmentIndex:(NSUInteger)index animated:(BOOL)animated { NSIndexPath *indexPath = [NSIndexPath indexPathForItem:index inSection:0]; [self.titleCollectionView selectItemAtIndexPath:indexPath animated:YES scrollPosition:UICollectionViewScrollPositionCenteredHorizontally]; } #pragma mark - - (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView { return 1; } -(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{ NSLog(@"%ld",self.titleArray.count); return self.titleArray.count; }-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{SegmentCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath]; cell.title = self.titleArray[indexPath.row]; return cell; }//根据文字长度计算 size - (CGSize )collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{ CGSize itemSize = [self.titleArray[indexPath.row] getStringSize:[UIFont systemFontOfSize:14] width:self.bounds.size.width]; return CGSizeMake(itemSize.width + 20, itemSize.height + 20); } -(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{ if (self.IndexChangeBlock) { self.IndexChangeBlock(indexPath.row); } [self.titleCollectionView scrollToItemAtIndexPath:indexPath atScrollPosition:UICollectionViewScrollPositionCenteredHorizontally animated:YES]; }/** *计算 label 高度的一般的自适应 * *@param font字号 *@param width 宽度 * *@returnsize */ - (CGSize)getStringSize:(UIFont*)font width:(CGFloat)width { NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:self]; NSDictionary *attrSyleDict = [[NSDictionary alloc] initWithObjectsAndKeys: font, NSFontAttributeName, nil]; [attributedString addAttributes:attrSyleDict range:NSMakeRange(0, self.length)]; CGRect stringRect = [attributedString boundingRectWithSize:CGSizeMake(width, MAXFLOAT) options:NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading context:nil]; return stringRect.size; }

自定义一个 xib cell
标签segmentControl分页显示--->使用UICollectionView
文章图片
使用UICollectionView_第1张图片" style="border:1px solid black; "> BD3ECA67-8C06-4BB2-940E-95ED8559040A.png 一个 label + ImageView 都是居中 (根据自己实际项目需求适当调整,我这个仅是选中状态有一个白色边框)
cell .m 中

标签segmentControl分页显示--->使用UICollectionView
文章图片
使用UICollectionView_第2张图片" style="border:1px solid black; "> 588C5E36-340E-4396-9980-6415095EB375.png cell.h 中
标签segmentControl分页显示--->使用UICollectionView
文章图片
使用UICollectionView_第3张图片" style="border:1px solid black; "> FB3FF3D4-AA3F-4C2B-AB90-F87AACBF44F6.png 使用: 怎么使用呢? 很简单把刚才创建的四个文件导入你的工程就可以使用了
![Uploading 屏幕快照 2016-04-11 下午5.26.27_802064.png . . .]
然后在你的 viewDidLoad 中 初始化
self.automaticallyAdjustsScrollViewInsets = NO; CGFloat screen_width = self.view.bounds.size.width; _titleSegView = [[SegmentControlView alloc] initWithFrame:CGRectMake(0, 64, screen_width, 55)]; self.titleSegView.backgroundColor = [UIColor blueColor]; [self.view addSubview:_titleSegView]; self.titleSegView.titleArray = @[@"标签1",@"标签2",@"标签3",@"标签4",@"标签5",@"标签6",@"标签7",]; [self.titleSegView setSelectedSegmentIndex:0 animated:YES]; __weak typeof(self) weakSelf = self; self.titleSegView.IndexChangeBlock = ^(NSInteger index){// 点击切换 CGPoint offset = weakSelf.mainScrollview.contentOffset; offset.x = index * screen_width; [weakSelf.mainScrollview setContentOffset:offset animated:YES]; }; // 创建一个 scrollView _mainScrollview = [[UIScrollView alloc] initWithFrame:CGRectMake(0, CGRectGetMaxY(_titleSegView.frame), screen_width, self.view.bounds.size.height - 110)]; self.mainScrollview.pagingEnabled = YES; self.mainScrollview.showsHorizontalScrollIndicator = NO; self.mainScrollview.showsVerticalScrollIndicator = NO; self.mainScrollview.contentSize = CGSizeMake(screen_width * self.titleSegView.titleArray.count, self.view.bounds.size.height - 110); self.mainScrollview.delegate = self; self.mainScrollview.bounces = NO; [self.view addSubview:_mainScrollview]; for (NSInteger i=0; i < self.titleSegView.titleArray.count ; i ++) { UILabel *label1 = [UILabel new]; label1.frame = CGRectMake(i *screen_width, 50, 100, 100); label1.backgroundColor = [UIColor redColor]; [self.mainScrollview addSubview:label1]; }

实现 scrollView 的代理方法
#pragma mark - UIScrollViewDelegate // 滑动切换 - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView { CGFloat pageWidth = scrollView.frame.size.width; NSInteger page = scrollView.contentOffset.x / pageWidth; [self.titleSegView setSelectedSegmentIndex:page animated:YES]; }

运行的效果图 标签segmentControl分页显示--->使用UICollectionView
文章图片
使用UICollectionView_第4张图片" style="border:1px solid black; "> DB211.gif 【标签segmentControl分页显示--->使用UICollectionView】代码下载

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