我有一个 collectionView
,其中每个 cell
都包含一个 UIImage
和一个空的 UIButton
。如何显示用户点击的图片?
class ImageCollectionViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout{
@IBOutlet weak var imageCollectionView: UICollectionView!
let images: [UIImage] = [
UIImage(named: "beerImage")!,
UIImage(named: "christmasImage")!,
UIImage(named: "goalImage")!,
UIImage(named: "travelImage")!,
UIImage(named: "rollerImage")!,
UIImage(named: "giftImage")!,
UIImage(named: "shirtImage")!,
UIImage(named: "dressImage")!,
]
let columnLayout = FlowLayout(
itemSize: CGSize(width: 150, height: 150),
minimumInteritemSpacing: 30,
minimumLineSpacing: 10,
sectionInset: UIEdgeInsets(top: 20, left: 20, bottom: 10, right: 20)
)
var colViewWidth: CGFloat = 0.0
override func viewDidLoad() {
self.imageCollectionView.collectionViewLayout = columnLayout
super.viewDidLoad()
imageCollectionView.dataSource = self
imageCollectionView.delegate = self
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return images.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "imageCell", for: indexPath) as! ImageCollectionViewCell
cell.imageView.image = images[indexPath.item]
cell.layer.cornerRadius = 2
return cell
}
@IBAction func imageButtonTapped(_ sender: Any) {
print("tapped")
}
@IBAction func closeButtonTapped(_ sender: Any) {
let storyBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let HomeViewController = storyBoard.instantiateViewController(withIdentifier: "HomeVC") as! ExampleViewController
self.present(HomeViewController, animated: false, completion: nil)
}
}
更新
最后我想将该图像传递给另一个 ViewController。我这样试过,但图片没有显示在另一个 ViewController 中:
ViewControllerA
var tappedImage = UIImage()
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
tappedImage = images[indexPath.row]
}
var showPopUpView = true
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
print(showPopUpView)
var vc = segue.destination as! ExampleViewController
vc.pickedImage = self.tappedImage
vc.ShowPopUpView = self.showPopUpView
}
ViewControllerB
var pickedImage = UIImage()
override func viewDidLoad() {
super.viewDidLoad()
imagePreview.image = pickedImage
最佳答案
由于评论中的对话:
操作顺序应该是:
- 用户点击单元格
- 根据所选单元格的
indexPath
获取图片 - 将其设置为临时变量 (
tappedImage
) - 执行转场
- 将临时图像传递给目的地的临时图像(
pickedImage
) - 加载目的地的 View
- 显示图像。
似乎您缺少其中一个步骤(可能是第 3 步,因为您没有在 ...didSelectItemAt indexPath...
中调用 performSegue
而它也许根本没有被调用!尝试在那里打印一些东西并检查它是否是真的)
或者您可能会打乱流程(可能您在目标的View
加载后设置图像,结果是看不到它。)
调试:
尝试在每个变量上打印您有权访问的所有变量(例如 tappedImage
、pickedImage
、images[indexPath.row]
等) 7 个状态并查看问题出在哪里以及您在哪里丢失了选定的图像引用
可能的问题
你没有使用 ...didSelectItemAt indexPath...
来performSegue
,可能你有一个 UIButton
,所以按钮正在阻止 cell
被选中。
关于ios - Swift - 从 UICollectionViewCell 获取 UIImage,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/58768604/