UI控件 20 UICollectionViewCell

创建步骤
1.实现两个协议 UICollectionViewDataSource,UICollectionViewDelegate
2.创建

UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc]init];

3.设置 flowLayout的属性 item大小列距行距等
4.初始化UICollectionView *对象
5.设置该对象的代理

collectionView.dataSource = self;
collectionView.delegate = self;

6.添加到视图显示

[self.view addSubview:collectionView];

7.注册

//注册时用UICollectionViewCell
[collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"cell"];

以上在VIewDidLoad中设置
8.设置了垂直布局,这样系统会在一行充满后进行第二行的排列，如果设置为水平布局，则会在一列充满后，进行第二列的布局，这种方式也被称为流式布局
9.导航栏的代码为什么要放在ViewWillAppear中？而不是放在ViewDidLoad中？

示例：

UICollectionView主要用于瀑布流，由于一直接触较少，每次需要使用的时候都从网上翻阅资料，此次自己总结整理，以备不时之需。

collectionView和tableView最大的不同之处就是需要自定义cell,所以第一步自定义collectionViewCell .h文件

#import <UIKit/UIKit.h>

@interface MyCollectionViewCell : UICollectionViewCell

@property (strong, nonatomic) UIImageView *topImage;

@property (strong, nonatomic) UILabel *botlabel;

@end

.m文件

#import "MyCollectionViewCell.h"

@implementation MyCollectionViewCell

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self)
    {
        _topImage  = [[UIImageView alloc] initWithFrame:CGRectMake(10, 0, 70, 70)];
        _topImage.backgroundColor = [UIColor redColor];
        [self.contentView addSubview:_topImage];
        
        _botlabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 80, 70, 30)];
        _botlabel.textAlignment = NSTextAlignmentCenter;
        _botlabel.textColor = [UIColor blueColor];
        _botlabel.font = [UIFont systemFontOfSize:15];
        _botlabel.backgroundColor = [UIColor purpleColor];
        [self.contentView addSubview:_botlabel];
    }
    
    return self;
}

@end

在viewController中实现collectionView的三个协议 UICollectionViewDataSource,UICollectionViewDelegate,UICollectionViewDelegateFlowLayout 具体实例化步骤均在代码中有注释，如下

#import "CollectionViewController.h"
#import "MyCollectionViewCell.h"

@interface CollectionViewController ()<UICollectionViewDataSource,UICollectionViewDelegate,UICollectionViewDelegateFlowLayout>
{
    UICollectionView *mainCollectionView;
}

@end

@implementation CollectionViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.view.backgroundColor = [UIColor whiteColor];
    
    //1.初始化layout
    UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
    //设置collectionView滚动方向
//    [layout setScrollDirection:UICollectionViewScrollDirectionHorizontal];
    //设置headerView的尺寸大小
    layout.headerReferenceSize = CGSizeMake(self.view.frame.size.width, 100);
    //该方法也可以设置itemSize
    layout.itemSize =CGSizeMake(110, 150);
    
    //2.初始化collectionView
    mainCollectionView = [[UICollectionView alloc] initWithFrame:self.view.bounds collectionViewLayout:layout];
    [self.view addSubview:mainCollectionView];
    mainCollectionView.backgroundColor = [UIColor clearColor];
    
    //3.注册collectionViewCell
    //注意，此处的ReuseIdentifier 必须和 cellForItemAtIndexPath 方法中 一致 均为 cellId
    [mainCollectionView registerClass:[MyCollectionViewCell class] forCellWithReuseIdentifier:@"cellId"];
    
    //注册headerView  此处的ReuseIdentifier 必须和 cellForItemAtIndexPath 方法中 一致  均为reusableView
    [mainCollectionView registerClass:[UICollectionReusableView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"reusableView"];
    
    //4.设置代理
    mainCollectionView.delegate = self;
    mainCollectionView.dataSource = self;
}

#pragma mark collectionView代理方法 //返回section个数

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
    return 3;
}

//每个section的item个数

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    return 9;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{

    MyCollectionViewCell *cell = (MyCollectionViewCell *)[collectionView dequeueReusableCellWithReuseIdentifier:@"cellId" forIndexPath:indexPath];
    
    cell.botlabel.text = [NSString stringWithFormat:@"{%ld,%ld}",(long)indexPath.section,(long)indexPath.row];
    
    cell.backgroundColor = [UIColor yellowColor];
    
    return cell;
}

//设置每个item的尺寸

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
    return CGSizeMake(90, 130);
}

//footer的size

//- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout referenceSizeForFooterInSection:(NSInteger)section
//{
//    return CGSizeMake(10, 10);
//}

//header的size
//- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section
//{
//    return CGSizeMake(10, 10);
//}

//设置每个item的UIEdgeInsets

- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section
{
    return UIEdgeInsetsMake(10, 10, 10, 10);
}

//设置每个item水平间距

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section
{
    return 10;
}

//设置每个item垂直间距

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section
{
    return 15;
}

//通过设置SupplementaryViewOfKind 来设置头部或者底部的view，其中 ReuseIdentifier 的值必须和注册是填写的一致，本例都为 “reusableView”

- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath
{
    UICollectionReusableView *headerView = [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"reusableView" forIndexPath:indexPath];
    headerView.backgroundColor =[UIColor grayColor];
    UILabel *label = [[UILabel alloc] initWithFrame:headerView.bounds];
    label.text = @"这是collectionView的头部";
    label.font = [UIFont systemFontOfSize:20];
    [headerView addSubview:label];
    return headerView;
}

//点击item方法

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
    MyCollectionViewCell *cell = (MyCollectionViewCell *)[collectionView cellForItemAtIndexPath:indexPath];
    NSString *msg = cell.botlabel.text;
    NSLog(@"%@",msg);
}

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

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end

完成以上两步，效果图如下：

UI控件 20 UICollectionViewCell

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