ios - UICollectionView 自定义单元格以在 Swift 中填充宽度

Question

我一直在想办法让单元格填满宽度，正如您在图片中看到的那样，单元格之间的宽度太大了。我正在使用只有一个 imageView 的自定义单元格。

我试图从 Storyboard 中对其进行自定义，但我想没有为此的选项，或者应该以编程方式完成。

我的 UICollectionViewController :

 @IBOutlet var collectionView2: UICollectionView!

    let recipeImages = ["angry_birds_cake", "creme_brelee", "egg_benedict", "full_breakfast", "green_tea", "ham_and_cheese_panini", "ham_and_egg_sandwich", "hamburger", "instant_noodle_with_egg.jpg", "japanese_noodle_with_pork", "mushroom_risotto", "noodle_with_bbq_pork", "starbucks_coffee", "thai_shrimp_cake", "vegetable_curry", "white_chocolate_donut"]

    override func viewDidLoad() {
        super.viewDidLoad()

        // Uncomment the following line to preserve selection between presentations
        // self.clearsSelectionOnViewWillAppear = false

        // Do any additional setup after loading the view.

    }


    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

override func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
        //#warning Incomplete method implementation -- Return the number of sections
        return 1
    }


    override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        //#warning Incomplete method implementation -- Return the number of items in the section
         return recipeImages.count
    }

    override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as! RecipeCollectionViewCell

        // Configure the cell
        cell.recipeImageView.image = UIImage(named: recipeImages[indexPath.row])

        return cell
    }

Answer 1

您需要以编程方式执行此操作。

在您的 View Controller 中实现 UICollectionViewDelegateFlowLayout 并在 collectionView:layout:sizeForItemAtIndexPath: 中提供大小

func collectionView(_ collectionView: UICollectionView,
                        layout collectionViewLayout: UICollectionViewLayout,
                        sizeForItemAt indexPath: IndexPath) -> CGSize {
        let kWhateverHeightYouWant = 100
        return CGSizeMake(collectionView.bounds.size.width, CGFloat(kWhateverHeightYouWant))
}

您还需要在 View Controller 的 viewWillLayoutSubviews() 中调用 collectionView.collectionViewLayout.invalidateLayout()，这样当主视图的尺寸发生变化时(旋转时，对于例如)， Collection View 被重新布局。

swift 4 更新

func collectionView(_ collectionView: UICollectionView,
                            layout collectionViewLayout: UICollectionViewLayout,
                            sizeForItemAt indexPath: IndexPath) -> CGSize {
            let kWhateverHeightYouWant = 100
            return CGSize(width: collectionView.bounds.size.width, height: CGFloat(kWhateverHeightYouWant))
}