Question

collectionView怎么添加头视图

Answer 1

详细代码如下：
<pre name="code" class="objc">//
// HomeViewController.m
// collection添加头部
//
// Created by user on 15/10/10.
// Copyright (c) 2015年 user. All rights reserved.
//

#import "HomeViewController.h"
#import "ConstomCell.h"

static NSString *headerViewIdentifier = @"hederview";

@interface HomeViewController ()<UICollectionViewDataSource,UICollectionViewDelegate>

@property (nonatomic,strong) UIImageView *headerImage;

@end

@implementation HomeViewController

- (void)viewDidLoad {
[super viewDidLoad];
//1.添加collectionview
[self addCollectionView];

}

-(void)addCollectionView
{
UICollectionViewFlowLayout *layout=[[UICollectionViewFlowLayout alloc]init];
layout.minimumLineSpacing=20; //设置每一行的间距
layout.itemSize=CGSizeMake(100, 100); //设置每个单元格的大小
layout.sectionInset=UIEdgeInsetsMake(0, 0, 50, 0);
layout.headerReferenceSize=CGSizeMake(self.view.frame.size.width, 250); //设置collectionView头视图的大小

UICollectionView *collectionView=[[UICollectionView alloc]initWithFrame:self.view.bounds collectionViewLayout:layout];
collectionView.frame=self.view.bounds;
//注册cell单元格
[collectionView registerNib:[UINib nibWithNibName:@"ConstomCell" bundle:nil] forCellWithReuseIdentifier:@"cell"];
//注册头视图
[collectionView registerClass:[UICollectionReusableView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:headerViewIdentifier];

collectionView.backgroundColor=[UIColor whiteColor];
collectionView.delegate=self;
collectionView.dataSource=self;
[self.view addSubview:collectionView];
}

#pragma mark 返回多少行
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{

return 13;
}
#pragma markk 返回的单元格
-(UICollectionViewCell*)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
ConstomCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:@"cell" forIndexPath:indexPath];

return cell;
}

// 返回头视图
- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath
{
//如果是头视图
if ([kind isEqualToString:UICollectionElementKindSectionHeader]) {
UICollectionReusableView *header=[collectionView dequeueReusableSupplementaryViewOfKind:kind withReuseIdentifier:headerViewIdentifier forIndexPath:indexPath];
//添加头视图的内容
[self addContent];
//头视图添加view
[header addSubview:self.headerImage];
return header;
}
//如果底部视图
// if([kind isEqualToString:UICollectionElementKindSectionFooter]){
//
// }
return nil;
}
/*
* 补充头部内容
*/
-(void)addContent
{
UIImageView *headerImage=[[UIImageView alloc]init];
headerImage.contentMode=UIViewContentModeScaleAspectFill;
headerImage.clipsToBounds=YES;
headerImage.frame=CGRectMake(0, 0, self.view.frame.size.width, 250);
headerImage.image=[UIImage imageNamed:@"mei"];
self.headerImage=headerImage;
}

@end