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UICollectionView UICollectionView基于UIScrollView，系统默认内容自动偏移64各单位 ，所以可以通过设置以下设置取消偏移 self.automaticallyAdjustsScrollViewInsets = NO; UICollectionView必须设置瀑布流UICollectionViewFlowLayout，如： UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc]init]; layout.minimumLineSpacing = 5.0; layout.minimumInteritemSpacing = 5.0; layout.sectionInset = UIEdgeInsetsMake(5.0, 5.0, 5.0, 5.0); UICollectionView必须设置数据源和代理,如： _mineCollection = [[UICollectionView alloc]initWithFrame:CGRectMake(0, 64.0, DEVICE_WIDTH, DEVICE_HEIGHT - 64.0) collectionViewLayout:layout]; _mineCollection.backgroundColor = [UIColor lightGrayColor]; _mineCollection.dataSource = self; _mineCollection.delegate = self; cell必须通过注册,如： [_mineCollectio
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