[英]Swift - get UIImage from UIColllectionViewCell
我有一个collectionView
,其中每个cell
都包含一个UIImage
和一个空的UIButton
。 我如何查看用户点击的图片?
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。 我尝试过这种方式,但图片没有显示在另一个 ViewController 中:
视图控制器A
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
}
视图控制器B
var pickedImage = UIImage()
override func viewDidLoad() {
super.viewDidLoad()
imagePreview.image = pickedImage
你可以做这样的事情
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
imageToPass = images[indexPath.row]
}
编辑:至于将该图像传递给您的下一个视图 controller,一种可能的方法是将属性添加到图像的第一个和第二个视图控制器,在您的didSelectItemAt
调用中设置该图像,然后使用prepare(for segue: UIStoryboardSegue, sender: Any?)
let imageToPass: UIImage?
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "identifier name here" {
// Get the new view controller using segue.destination.
if let destVC = segue.destination as? SecondViewController {
// Pass the selected object to the new view controller.
destVC.image = imageToPass
}
}
}
评论中的对话二重奏:
动作的顺序应该是:
indexPath
获取图像tappedImage
)pickedImage
) 好像你错过了这些步骤之一(可能是第 3 步,因为你没有在 ...didSelectItemAt indexPath 中调用performSegue
...didSelectItemAt indexPath...
而且它可能根本没有被调用!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View
加载后设置图像,结果是看不到。)
尝试在这 7 个状态中打印您可以访问的所有变量(例如tappedImage
、 pickedImage
、 images[indexPath.row]
等),看看问题出在哪里以及您在哪里丢失了选定的图像参考
您没有使用...didSelectItemAt indexPath...
performSegue
执行Segue ,可能您有一个UIButton
,因此该按钮阻止了cell
被选中。
尝试这个
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let image = images[indexPath.row]
//Result image
}
(或)如果您想通过按钮点击获取图像(不推荐)
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
//Replace your button
cell.yourButton.tag = indexPath.row
cell.yourButton.addTarget(self, action: #selector(self.imageButtonTapped(_:)), for: .touchUpInside)
}
在按钮动作中
func imageButtonTapped(_ sender: UIButton) {
let image = images[sender.tag]
//Result image
}
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