collectionview使用

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创建UICollectionViewFlowLayout 对象来设置相关的布局，包括itemSize，headerReferenceSize，sectionInset。设置对应的布局大小，相关的和顶部之间的间距等。

UICollectionView创建对应的view并且定义对应的大小，设置代理方法和数据源对象。

-(void)loadCollectionView{    UICollectionViewFlowLayout * collectionViewFlow = [[UICollectionViewFlowLayout alloc]init];   UICollectionView *collectView = [[UICollectionView alloc]initWithFrame:CGRectMake(0, ScreenHeight, CGRectGetWidth(_homeScrollView.frame), 2000)collectionViewLayout:collectionViewFlow];        collectView.dataSource = self;    collectView.delegate = self;    collectView.backgroundColor = [UIColor blueColor];    [collectView registerClass:[CSHomeCollectionViewCell class] forCellWithReuseIdentifier:@"collectionCell"];    collectionViewFlow.itemSize = CGSizeMake(93, 120);    collectionViewFlow.sectionInset = UIEdgeInsetsMake(40, 0, 0, 0);    collectionViewFlow.scrollDirection  = UICollectionViewScrollDirectionVertical;    [_homeScrollView addSubview:collectView];}//datasource,delegate-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{    return 20;}-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{      CSHomeCollectionViewCell * cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"collectionCell" forIndexPath:indexPath];    cell.topImage.image = [UIImage imageNamed:@"cludy_bg"];    return cell;}

从而来实现对应的方法，其中自定义的cell类

-(instancetype)initWithFrame:(CGRect)frame{    self =[super initWithFrame:frame];    if (self) {        self.backgroundColor = [UIColor grayColor];        self.topImage = [[UIImageView  alloc]initWithFrame:CGRectMake(5, 5, MYSIZE.width-10, MYSIZE.height*0.6)];        [self addSubview:_topImage];                self.designer = [[UILabel alloc]initWithFrame:CGRectMake(5, CGRectGetHeight(self.topImage.frame), CGRectGetWidth(self.frame), 20)];            self.designer.text = @"hello";        [self addSubview:_designer];        //        self.goodBtn = [UIButton alloc]initWithFrame:CGRectMake(0, <#CGFloat y#>, <#CGFloat width#>, <#CGFloat height#>)            }    return self;}

当定义的时候，自动调用initwithframe函数来初始化

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