UICollectionView

- (void)viewDidLoad {
[super viewDidLoad];
mytable =[[UITableView alloc]initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT-69-49)];
mytable.backgroundColor =[UIColor whiteColor];
mytable.separatorStyle =UITableViewCellSeparatorStyleNone;
[self.view addSubview:mytable];

UICollectionViewFlowLayout *flowLayout =[[UICollectionViewFlowLayout alloc]init];
//设置cell的最小间距(默认貌似为10).
flowLayout.minimumInteritemSpacing =0;
[flowLayout setScrollDirection:UICollectionViewScrollDirectionVertical];

MycollectionView =[[UICollectionView alloc]initWithFrame:CGRectMake( 0, 20, SCREEN_WIDTH, SCREEN_HEIGHT-69-49 -20) collectionViewLayout:flowLayout];
[MycollectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"shiping"];
MycollectionView.delegate =self;
MycollectionView.dataSource =self;
[mytable addSubview:MycollectionView];
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
return 8;
}

//设置每个item上的控件
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
NSString *identifier =[NSString stringWithFormat:@"shiping"];
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];
UIButton *btn =[[UIButton alloc]initWithFrame:CGRectMake(0, 0, (SCREEN_WIDTH -30)/2, (SCREEN_WIDTH -30)/2)];
[btn setBackgroundImage:[UIImage imageNamed:@"news2"] forState:UIControlStateNormal];
[cell addSubview:btn];
return cell;
}

//设置每个item的大小
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
return CGSizeMake((SCREEN_WIDTH -30)/2, (SCREEN_WIDTH -30)/2);
}

//设置每行的位置
-(UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section
{
// x =离顶部距离, y =离左侧距离  ,  m =？  , n =理由测距离
return UIEdgeInsetsMake(10, 10, 10, 10);//分别为上、左、下、右
}

//设置每行间距
- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section
{
return 10;
}