网格

//ViewController.m

#import "ViewController.h"#import "HeaderCollectionReusableView.h"#import "FooterCollectionReusableView.h"#import "MyCell.h"@interface ViewController (){

}

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

//创建流布局对象

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

//设定单元格的大小

Flow.itemSize = CGSizeMake(70, 100);

//设置滚动方向

Flow.scrollDirection = UICollectionViewScrollDirectionVertical;

//设置最小行间隔

Flow.minimumLineSpacing = 100;

//设置最小列间距

Flow.minimumInteritemSpacing = 10;

//设定分区的间距

Flow.sectionInset = UIEdgeInsetsMake(50, 10, 20, 10);

//设置页眉的尺寸

Flow.headerReferenceSize = CGSizeMake(self.view.frame.size.width, 30);

//设置页脚的尺寸

Flow.footerReferenceSize = CGSizeMake(self.view.frame.size.width, 30);

//创建网格对象

UICollectionView *theCollect = [[UICollectionView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height) collectionViewLayout:Flow];

//

theCollect.delegate = self;

theCollect.dataSource = self;

//是否按页滑动

theCollect.pagingEnabled = YES;

theCollect.backgroundColor = [UIColor whiteColor];

[self.view addSubview:theCollect];

//注册单元格

[theCollect registerClass:[MyCell class] forCellWithReuseIdentifier:@"Mycell"];

//注册页眉

[theCollect registerClass:[HeaderCollectionReusableView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"Header"];

//注册页脚

[theCollect registerClass:[FooterCollectionReusableView class] forSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:@"Footer"];

}

#pragma -UICollectionViewDataSource

-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView

{

return 2;

}

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

{

if (section == 0)

{

return 5;

}

else if (section == 1)

{

return 10;

}

return 0;

}

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

{

MyCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"Mycell" forIndexPath:indexPath];

//

cell.Img.image = [UIImage imageNamed:@"2.jpg"];

cell.textLb.text = @"信";

return cell;

}

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

{

UICollectionReusableView *reusbleV = nil;

if ([kind isEqualToString:UICollectionElementKindSectionHeader])

{

reusbleV = [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"Header" forIndexPath:indexPath];

HeaderCollectionReusableView *header = (HeaderCollectionReusableView *)reusbleV;

header.titleLb.text = @"我是页眉";

}

else if ([kind isEqualToString:UICollectionElementKindSectionFooter])

{

reusbleV = [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:@"Footer" forIndexPath:indexPath];

FooterCollectionReusableView *Footer = (FooterCollectionReusableView *)reusbleV;

Footer.titleLb.text = @"我是页脚";

}

return reusbleV;

}

@end

//HeaderCollectionReusableView.h

#import@interface HeaderCollectionReusableView : UICollectionReusableView

@property (nonatomic,strong)UILabel *titleLb;

@end

//HeaderCollectionReusableView.m

#import "HeaderCollectionReusableView.h"

@implementation HeaderCollectionReusableView
//单例方法

- (instancetype)initWithFrame:(CGRect)frame
{
    if (self == [super initWithFrame:frame])
    {
        [self addSubview:self.titleLb];
    }
    return self;
}
//懒加载
- (UILabel *)titleLb
{
    if (!_titleLb)
    {
        _titleLb = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 200, 20)];
       
        [_titleLb setTextColor:[UIColor whiteColor]];
    }
    return _titleLb;
}
@end

//FooterCollectionReusableView.m

#import <UIKit/UIKit.h>

@interface FooterCollectionReusableView : UICollectionReusableView
@property (nonatomic,strong)UILabel *titleLb;
@end

//FooterCollectionReusableView.m

#import "FooterCollectionReusableView.h"

@implementation FooterCollectionReusableView
//单例方法

- (instancetype)initWithFrame:(CGRect)frame
{
    if (self == [super initWithFrame:frame])
    {
        [self addSubview:self.titleLb];
    }
    return self;
}
//懒加载
- (UILabel *)titleLb
{
    if (!_titleLb)
    {
        _titleLb = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 200, 20)];
       
        [_titleLb setTextColor:[UIColor whiteColor]];
    }
    return _titleLb;
}
@end

//MyCell.h

#import <UIKit/UIKit.h>

@interface MyCell : UICollectionViewCell
@property (nonatomic,strong)UIImageView *Img;
@property (nonatomic,strong)UILabel *textLb;
@end

//MyCell.m

#import "MyCell.h"

@implementation MyCell
- (instancetype)initWithFrame:(CGRect)frame
{
    if (self = [super initWithFrame:frame])
    {
        [self addSubview:self.Img];
        [self addSubview:self.textLb];
    }
    return self;
}
- (UIImageView *)Img
{
    if (!_Img)
    {
        _Img = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 80, 80)];
        _Img.layer.cornerRadius = 80/2;
        _Img.layer.masksToBounds = YES;
    }
    return _Img;
}
- (UILabel *)textLb
{
    if (!_textLb)
    {
        _textLb = [[UILabel alloc]initWithFrame:CGRectMake(0, 80, 80, 20)];
        _textLb.textAlignment = NSTextAlignmentCenter;
        _textLb.textColor = [UIColor blackColor];
       
    }
    return _textLb;
}
@end