'UICollectionView must be initialized with a non-nil layout parameter' 报错原因及解决
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'UICollectionView must be initialized with a non-nil layout parameter'
这个报错是因为 CollectionView在创建的时候或者在跳转页面的时候没有指定其
UICollectionViewFlowLayout
// UICollectionViewFlowLayout *flow = [[UICollectionViewFlowLayout alloc]init];
// CollectionViewController *VC = [[CollectionViewController alloc]initWithCollectionViewLayout:flow];
CollectionViewController *vc = [[CollectionViewControlleralloc]init];
要把下面的代码换成上面的代码 就可以了
另外 UICollectionViewFlowLayout 也是手写代码时候必要的布局属性
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