添加代理
UICollectionViewDelegate，UICollectionViewDataSource，UICollectionViewDelegateFlowLayout
添加UICollectionViewFlowLayout
CGFloat viewWidth = [UIScreen mainScreen].bounds.size.width;
CGFloat viewHeight = [UIScreen mainScreen].bounds.size.height;
UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
// 设置每个item的大小，
layout.itemSize = CGSizeMake(90, 90);
// 设置列的最小间距
layout.minimumInteritemSpacing = 10;
// 设置最小行间距
layout.minimumLineSpacing = 20;
// 设置布局的内边距
layout.sectionInset = UIEdgeInsetsMake(10, 10, 10, 10);
// 滚动方向
layout.scrollDirection = UICollectionViewScrollDirectionVertical;
添加UICollectionView
UICollectionView *aCollectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(10, 100, viewWidth-20, viewHeight-300) collectionViewLayout:layout];
aCollectionView.backgroundColor = [UIColor whiteColor];
aCollectionView.delegate = self;
aCollectionView.dataSource = self;
[aCollectionView registerClass:[CustomCollectionViewCell class] forCellWithReuseIdentifier:@"cell"];
[self.view addSubview:aCollectionView];
实现代理方法
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
return 80;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
CustomCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"cell" forIndexPath:indexPath];
cell.contentView.backgroundColor = [UIColor grayColor];
cell.topImg.image = [UIImage imageNamed:@"icn_choice"];
cell.titleLbl.text = @"hello";
return cell;
}
UICollectionViewDelegateFlowLayout代理方法
//动态设置每个Item的尺寸大小
- (CGSize)collectionView:(UICollectionView*)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath*)indexPath;
//动态设置每个分区的EdgeInsets
- (UIEdgeInsets)collectionView:(UICollectionView*)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section;
//动态设置每行的间距大小
- (CGFloat)collectionView:(UICollectionView*)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section;
//动态设置每列的间距大小
- (CGFloat)collectionView:(UICollectionView*)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section;
//动态设置某组头视图大小
- (CGSize)collectionView:(UICollectionView*)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section;
//动态设置某组尾视图大小
- (CGSize)collectionView:(UICollectionView*)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForFooterInSection:(NSInteger)section;
自定义UICollectionViewCell
CustomCollectionViewCell.H文件
#import@interface CustomCollectionViewCell : UICollectionViewCell
@property (nonatomic,strong)UILabel* titleLbl;
@property (nonatomic,strong)UIImageView* topImg;
@end
CustomCollectionViewCell.M文件
#import "CustomCollectionViewCell.h"
@implementation CustomCollectionViewCell
- (instancetype)initWithFrame:(CGRect)frame{
if (self = [super initWithFrame:frame]) {
}
return self;
}
- (UILabel*)titleLbl{
if (_titleLbl == nil) {
_titleLbl = [[UILabel alloc] initWithFrame:CGRectMake(10, 10, self.frame.size.width-20, 20)];
_titleLbl.textColor = [UIColor greenColor];
[self.contentView addSubview:_titleLbl];
}
return _titleLbl;
}
- (UIImageView*)topImg{
if (_topImg == nil) {
_topImg = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
[self.contentView addSubview:_topImg];
}
return _topImg;
}
@end
