ios - 使用图像选择器将图像加载到两个 Collection View 单元格

Question

我目前正在构建一个应用程序，其目标是用户可以通过点击单元格内的按钮将图像上传到所需的 Collection View 单元格。到目前为止，我已经能够选择图像，但它永远不会进入指定的单元格。为了简化问题，我将显示前三个单元格使用的代码。

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let returnCell = collectionView.dequeueReusableCellWithReuseIdentifier("cell1", forIndexPath: indexPath) as! FirstCollectionViewCell

    if indexPath.row == 0 {
        let cell1 = collectionView.dequeueReusableCellWithReuseIdentifier("cell1", forIndexPath: indexPath) as! FirstCollectionViewCell
        cell1.backgroundColor = UIColor.redColor()
        cell1.firstAdd.addTarget(self, action: "importPicture:", forControlEvents: UIControlEvents.TouchUpInside)
        currentPickerTarget = cell1.firstImages
        return cell1

    } else if indexPath.row == 1 {

        let cell2 = collectionView.dequeueReusableCellWithReuseIdentifier("cell2", forIndexPath: indexPath) as! SecondCollectionViewCell
        cell2.backgroundColor = UIColor.blueColor()
        cell2.secondAdd.addTarget(self, action: "secondImport:", forControlEvents: UIControlEvents.TouchUpInside)
        secondPickerTarget = cell2.secondImages
        return cell2

    } else if indexPath.row == 2 {
        let cell3 = collectionView.dequeueReusableCellWithReuseIdentifier("cell3", forIndexPath: indexPath) as! ThirdCollectionViewCell
        cell3.backgroundColor = UIColor.redColor()
        cell3.thirdAdd.addTarget(self, action: #selector(ViewController.importPicture(_:)), forControlEvents: .TouchUpInside)
        return cell3
    }
return returnCell

}

 func importPicture(sender: UIButton) {

    let point = myCollectionView.convertPoint(CGPoint.zero, fromView: sender)
    let indexPath = myCollectionView.indexPathForItemAtPoint(point)
    let cell1 = myCollectionView.dequeueReusableCellWithReuseIdentifier("cell1", forIndexPath: indexPath!) as! FirstCollectionViewCell

    currentPickerTarget = cell1.firstImages

    imagePicker.delegate = self
    imagePicker.sourceType = .PhotoLibrary
    imagePicker.allowsEditing = true

    presentViewController(imagePicker, animated: true, completion: nil)
}

func secondImport(sender: UIButton) {
    let point = myCollectionView.convertPoint(CGPoint.zero, fromView: sender)
    let indexPath = myCollectionView.indexPathForItemAtPoint(point)
    let cell2 = myCollectionView.dequeueReusableCellWithReuseIdentifier("cell2", forIndexPath: indexPath!) as! SecondCollectionViewCell

    print("\(indexPath!.row)")

    secondPickerTarget = cell2.secondImages
    secondPicker.delegate = self
    secondPicker.sourceType = .PhotoLibrary
    secondPicker.allowsEditing = true

    presentViewController(secondPicker, animated: true, completion: nil)

}

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {

    imagePicker.dismissViewControllerAnimated(true, completion: nil)
    secondPicker.dismissViewControllerAnimated(true, completion: nil)

    let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage
    currentPickerTarget.image = pickedImage
    secondPickerTarget.image = pickedImage
}

Answer 1

您可以制作一组默认图像或空白图像，并在 ImageView 上方的每个单元格上添加一个按钮。根据单元格将标签分配给按钮。当用户点击任何单元格时，检测其计数，然后从图库或相机中选择图片，更新数组中索引处的对象并重新加载 Collection View ，或者您可以在 Collection View 中重新加载特定单元格。希望这有帮助:)