以编程方式将约束添加到collectionview

Question

我的Controller UIView和UICollectionView中有两个视图。 我正在迅速而不是情节提要。并且我以这种方式添加约束

// Constraints for First View
FirstView.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 0).isActive = true
FirstView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
FirstView.topAnchor.constraint(equalTo: view.topAnchor, constant: 0).isActive = true

 //Constraints fro Collection View
 collectionView.translatesAutoresizingMaskIntoConstraints = false
 collectionView.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -50).isActive = true
 collectionView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
 collectionView.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 0).isActive = true
 collectionView.topAnchor.constraint(equalTo: view.topAnchor, constant: 50).isActive = true

但是这会使我的应用程序崩溃。我错了吗？ 请帮我怎么做？

Answer 1

您忘记了吗？

FirstView.translatesAutoresizingMaskIntoConstraints = false

Answer 2

我认为出现崩溃是您收藏视图的主要限制 可能会对您有帮助

添加约束：- FirstView.heightAnchor.constraint（equalToConstant：50）.isActive = true

更新约束：- collectionView.topAnchor.constraint（等于：FirstView.bottomAnchor，常数：0）.isActive = true