optimize: 当collectionView的delegate未实现代理方法'collectionView:didSelectIt… #1
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…mAtIndexPath:'时，仍然可以hook添加额外逻辑
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问题
当collectionView的delegate未实现代理方法'collectionView:didSelectItemAtIndexPath:'时，无法hook
本次提交/优化
optimize: 当collectionView的delegate未实现代理方法'collectionView:didSelectItemAtIndexPath:'时，仍然可以hook添加额外逻辑
用例，如下
测试：注释掉 使用者HZCategoryView.m中 line:38~42的 '- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath'方法实现。
优化前：hook无效
优化后：hook有效