可以滾動的集合視圖

這個demo寫的是將集合視圖添加到滾動視圖中，實現可以滑動的效果。

　　　　　　　　　　　　　　　　　　（效果圖）

1.創建視圖，定義集合視圖和滾動視圖

 1 #import "ViewController.h"
 2 #import "MyCollectionViewCell.h"//自定義的一個collectionViewCell
 3 #define MainWidth  [UIScreen mainScreen].bounds.size.width
 4 #define MainHeight [UIScreen mainScreen].bounds.size.height
 5 
 6 @interface ViewController ()<UICollectionViewDataSource,UICollectionViewDelegate>
 7 @property (nonatomic,strong)UICollectionView * collectView;
 8 @property (nonatomic,strong)UIScrollView * scrollView;
 9 @property (nonatomic,strong)UICollectionViewFlowLayout * collectVFL;
10 @end

2.初始化我們定義的集合視圖和滾動視圖

 1 - (void)viewDidLoad {
 2     [super viewDidLoad];
 3      //設置底部滾動效果_1
 4     self.scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0,MainHeight-64-55, MainWidth-55 ,55)];//設定滾動視圖顯示在屏幕中的尺寸
 5     self.scrollView.backgroundColor = [UIColor clearColor];
 6     self.scrollView.bounces = NO;
 7     self.scrollView.contentSize = CGSizeMake((MainWidth-55)/3 * 5 , 55);//滾動視圖的總尺寸
 8     [self.view addSubview:self.scrollView];
 9 
10     //設置底部滾動效果_2
11    //UICollectionViewFlowLayout就是為集合視圖佈局，它繼承於UICollectionViewLayout（相關屬性就不再這一一列舉，請自行查找官方文檔）
12     UICollectionViewFlowLayout * collectVFL = [[UICollectionViewFlowLayout alloc]init]; 
13     collectVFL.itemSize = CGSizeMake((MainWidth-55)/3, 55);
14     collectVFL.minimumLineSpacing = 0;
15     collectVFL.minimumInteritemSpacing = 0;
16     collectVFL.scrollDirection = UICollectionViewScrollDirectionHorizontal;
17     self.collectVFL = collectVFL;
18     
19     UICollectionView * collectView = [[UICollectionView alloc]initWithFrame:CGRectMake(0,0,(MainWidth-55)/3*5 ,55)     collectionViewLayout:collectVFL];
20     self.collectView = collectView;
21     collectView.backgroundColor = [UIColor whiteColor];
22     collectView.delegate =  self;
23     collectView.dataSource = self;
24     collectView.scrollEnabled =NO;
25     //註意點：集合視圖在初始化後需要註冊
26     [collectView registerClass:[MyCollectionViewCell class] forCellWithReuseIdentifier:@"cell"];
27     //將集合視圖添加在滾動視圖上
28     [self.scrollView addSubview:collectView];
29     
30     [self.view setBackgroundColor:[UIColor grayColor]];
31 
32 }

3.實現集合視圖的代理方法

 1 #pragma mark - 集合視圖代理
 2 - (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
 3     return  5;
 4 }
 5 
 6 - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
 7     
 8     static NSString * ide = @"cell";
 9     MyCollectionViewCell * cell = [collectionView dequeueReusableCellWithReuseIdentifier:ide forIndexPath:indexPath];
10     
11     cell.titleLabel.text = @"哈哈哈";
12     cell.backgroundColor = [UIColor clearColor];
13     cell.photoImage.image =  [UIImage imageNamed:@"運行狀態@2x"];
14     return cell;
15 }
16 
17 - (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{
18         NSLog(@"點擊的Item:%ld",indexPath.item);
19 }

4.結束！ 此文是小編第一次書寫博客，有不足的地方還請大神指點改正。