所以在我的應用程式中，我目前有一個帶有自定義單元格的 tableView，其中有一個 imageView。這是一張供參考的圖片，以查看它的外觀，這是定義自定義單元格的代碼：
class GearComponentTableViewCell: UITableViewCell {
var delegate:Stepper?
var tableViewCellPosition: Int! = nil
// Image
@IBOutlet weak var itemImage: UIImageView!
// Name
@IBOutlet weak var itemName: UILabel!
// Weight
@IBOutlet weak var itemWeight1: UILabel!
@IBOutlet weak var itemWeight2: UILabel!
// Quanity
@IBOutlet weak var itemQuanity: UILabel!
@IBAction func stepperPressed (_ sender: UIStepper!) {
if (sender.value == 1) {
sender.value = 0
delegate?.stepperWasPressed(didIncrease: true, namePassed: itemName.text!, userindexPath: tableViewCellPosition)
} else if (sender.value == -1) {
sender.value = 0
delegate?.stepperWasPressed(didIncrease: false, namePassed: itemName.text!, userindexPath: tableViewCellPosition)
}
}
// Notes
@IBOutlet weak var itemNotes: UILabel!
}
這些單元格是可點擊的，當點擊它們時，它們會顯示一個警報，其中包含用于將影像添加到您選擇的單元格的選項：
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
print("User selected item: \(indexPath.row) and name is \(itemArray[indexPath.row].name)")
showPopUp(itemChosen: indexPath)
}
這是彈出/警報的邏輯：
func showPopUp(itemChosen: IndexPath) {
let alert = UIAlertController(title: "Add Photo To Item", message: .none, preferredStyle: .actionSheet)
// alert actions
let action1 = UIAlertAction(title: "Take Photo", style: .default) { action in
self.takePhoto()
}
let action2 = UIAlertAction(title: "Import Photo", style: .default) { action in
self.importPhoto(position: itemChosen)
}
let action3 = UIAlertAction(title: "Cancel", style: .destructive)
alert.addAction(action1)
alert.addAction(action2)
alert.addAction(action3)
present(alert, animated: true,completion: nil)
}
忽略該takePhoto()函式，因為它還沒有被使用，但在它的正下方，我正在呼叫該importPhoto()函式，該函式采用您選擇的專案的位置：
func importPhoto(position: IndexPath) {
print("User chose to import photo")
let picker = UIImagePickerController()
picker.allowsEditing = true
picker.delegate = self
present(picker, animated: true) {
print("cell tapped \(position)")
self.cellChosen = position
}
}
然后它為您選擇的專案設定一個全域變數（我知道這不是一個好的做法，而不是傳遞實際的 indexPath），我用來傳遞給 imagePickerControllerDelegate 函式：
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
guard let image = info[.editedImage] as? UIImage else { return }
dismiss(animated: true)
if let cell = tableView(gearTableView, cellForRowAt: cellChosen) as? GearComponentTableViewCell {
cell.itemImage.image = image
self.updateUI()
print("item image set for the item at position: \(cellChosen.row)")
}else {
print("did not set item image")
}
}
這就是我現在遇到問題的地方。當呼叫該委托函式時，它會成功列印 if/else 陳述句中的真實情況，并且實際上并未設定照片，并且在設定時我沒有收到任何錯誤。我收到的唯一錯誤是當我從帖子"Changing the translatesAutoresizingMaskIntoConstraints property of a UICollectionViewCell that is managed by a UICollectionView is not supported, and will result in incorrect self-sizing."中的第一張照片中點擊右側欄按鈕項以將新單元格添加到 tableView 時。在實際創建單元格之前，我需要另一個帶有文本欄位的警報形式的一些資訊，以獲取有關您正在創建的專案的一些資訊，我不確定該錯誤是否真的與我當前正在處理的內容相關。
Any ideas as to how I can set the image of the imageView in my cell? I've already tried changing the Layout of my imageView from Inferred (constraints) to Auto-resizing mask and any new cells stopped appearing...
Here is a link to my repository/the viewController I was working in.
uj5u.com熱心網友回復：
It's because you're not updating the image on the data source of the table view. You update when you dequeue the cell, but the you call updateUI that calls reloadData().
For instance, your method imagePickerController can work like this:
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
guard let image = info[.editedImage] as? UIImage else { return }
dismiss(animated: true)
let item = itemArray[cellChosen.row]
let userSubmittedItem = GearItem(itemName: item.name,
itemImage: image,
itemWeight1: item.weight1,
itemWeight2: item.weight2,
itemQuantity: item.quantity,
itemNotes: item.notes)
itemArray[cellChosen.row] = userSubmittedItem
self.updateUI()
}
uj5u.com熱心網友回復：
Change your implementation of method imagePickerController(_ picker:didFinishPickingMediaWithInfo:) to
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
guard let image = info[.editedImage] as? UIImage else { return }
picker.dismiss(animated: true)
itemArray[cellChosen.row].image = image
gearTableView.reloadRows(at: [cellChosen], with: .none)
}
When you need to update an image of a data source model. You update the model and call reload row.
About why your code doesn't work, set a breakpoint at func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell, and you will find your imageView's image is beening reset in above method.
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標籤：ios swift uitableview uiimagepickercontroller