UICollectionView 集合视图用法,自定义Cell

在View里面

//1.创建UICollectionViewFlowLayout

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

//设置

//1.1设置大小

flowLayout.itemSize=CGSizeMake(90, 90);

//1.2设置左右间距(注意如果给定间距,无法满足屏幕的宽度,设置无效)

flowLayout.minimumInteritemSpacing=10;

//1.3设置上下间距

flowLayout.minimumLineSpacing=20;

//1.4设置活动方向

flowLayout.scrollDirection=UICollectionViewScrollDirectionVertical;

//1.5设置Header

flowLayout.headerReferenceSize=CGSizeMake(self.bounds.size.width,100);

//1.6设置Footer

flowLayout.footerReferenceSize=CGSizeMake(self.bounds.size.width, 100);

//1.7设置内边距

flowLayout.sectionInset=UIEdgeInsetsMake(10, 10, 10, 10);

//2.创建集合视图

self.coll=[[UICollectionView alloc] initWithFrame:self.bounds collectionViewLayout:flowLayout];

//背景颜色默认黑色

self.coll.backgroundColor=[UIColor whiteColor];

//3.添加到页面

[self addSubview:self.coll];

***********************自定义CEll

//视图布局

-(void)addAllViews

{

//视图控件都要加载在contentView上

self.c_imageView=[[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.contentView.bounds.size.width, self.contentView.bounds.size.height*0.8)];

self.c_imageView.backgroundColor=[UIColor redColor];

[self.contentView addSubview:self.c_imageView];

self.c_label=[[UILabel alloc] init];

self.c_label.frame=CGRectMake(CGRectGetMinX(self.c_imageView.frame), CGRectGetMaxY(self.c_imageView.frame),self.contentView.bounds.size.width, self.contentView.bounds.size.height*0.2);

self.c_label.backgroundColor=[UIColor cyanColor];

[self.contentView addSubview:self.c_label];

}

//

-(void)layoutSubviews

{

[super layoutSubviews];

self.c_imageView.frame=CGRectMake(0, 0, self.contentView.bounds.size.width, self.contentView.bounds.size.height*0.8);

self.c_label.frame=CGRectMake(CGRectGetMinX(self.c_imageView.frame), CGRectGetMaxY(self.c_imageView.frame),self.contentView.bounds.size.width, self.contentView.bounds.size.height*0.2);

}

**********************************

#import "RootViewController.h"

#import "RootView.h"

#import "Mycell.h"

//标识

#define kcollCell @"collCell"

#define kHeaderView @"headerView"

#define kFooterView @"footerView"

//4.遵循集合视图的代理,数据协议

@interface RootViewController ()<UICollectionViewDataSource,UICollectionViewDelegate,UICollectionViewDelegateFlowLayout>

//FlowLayout不需要设置代理

@property(nonatomic,strong)RootView *rv;

@end

@implementation RootViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

{

self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

if (self) {

// Custom initialization

self.rv=[[RootView alloc] initWithFrame:[UIScreen mainScreen].bounds];

}

return self;

}

-(void)loadView

{

self.view=self.rv;

}

- (void)viewDidLoad

{

[super viewDidLoad];

//5.设置代理

self.rv.coll.dataSource=self;

self.rv.coll.delegate=self;

// Do any additional setup after loading the view.

//6.注册cell

[self.rv.coll registerClass:[Mycell class] forCellWithReuseIdentifier:kcollCell];

}

//每个分组多少个

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section

{

return 102;

}

//返回cell

// The cell that is returned must be retrieved from a call to -dequeueReusableCellWithReuseIdentifier:forIndexPath:

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

{

//7.创建cell(改为自己的cell)

Mycell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:kcollCell forIndexPath:indexPath];

cell.c_imageView.image=[UIImage imageNamed:@"1347722492473[1].jpg"];

cell.c_label.text=@"妞儿";

//注册header

[self.rv.coll registerClass:[UICollectionReusableView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:kHeaderView];

//注册footer

[self.rv.coll registerClass:[UICollectionReusableView class] forSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:kFooterView];

float red=arc4random()%256/255.0;

float green=arc4random()%256/255.0;

float blue=arc4random()%256/255.0;

cell.backgroundColor=[UIColor colorWithRed:red green:green blue:blue alpha:0.5];

return cell;

}

-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath

{

NSLog(@"section: %d,row:%d",indexPath.section,indexPath.row);

}

//设置header和footer

-(UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath

{

if (kind==UICollectionElementKindSectionHeader) {

UICollectionReusableView *header=[collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:kHeaderView forIndexPath:indexPath];

UILabel *label=[[UILabel alloc] initWithFrame:CGRectMake(0, 0, 100, 50)];

label.backgroundColor=[UIColor blueColor];

[header addSubview:label];

label.text=@"哈哈";

header.backgroundColor=[UIColor redColor];

return header;

}

else

{

UICollectionReusableView *footer=[collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:kFooterView forIndexPath:indexPath];

footer.backgroundColor=[UIColor redColor];

return footer;

}

}

//

-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath

{

if (indexPath.row%2) {

return CGSizeMake(90, 90);

}

else

{

return CGSizeMake(60, 60);

}

}

//内边距

-(UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section

{

if (section==0) {

return  UIEdgeInsetsMake(10, 10, 10, 10);

}

else

{

return UIEdgeInsetsMake(90, 90, 90, 90);

}

}

//上下间距

-(CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section

{

if(section==0)

{

return 10;

}

else

{

return 20;

}

}

//左右间距

-(CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section

{

return 10;

}

//

-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section

{

return CGSizeMake(200,100 );

}

-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout referenceSizeForFooterInSection:(NSInteger)section

{

return  CGSizeMake(200, 100);

}

- (void)didReceiveMemoryWarning

{

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}