我不知道如何将数据从类传递到另一个结构。这是我的ViewController.swift文件。我有另一个名为Meme.swift的文件,用于保存结构。我试图将结构放在ViewController.swift文件以及Meme.swift文件中,但我无法访问像topTextField.text
和lowTextField.text
这样的值并在结构中使用它们。谁能帮我这个?
视图控制器:
导入UIKit
类ViewController:UIViewController,UIImagePickerControllerDelegate,UINavigationControllerDelegate,UITextFieldDelegate { @IBOutlet weak var cameraButton:UIBarButtonItem!
@IBOutlet weak var bottomTextField: UITextField!
@IBOutlet weak var topTextField: UITextField!
@IBOutlet weak var imagePickerView: UIImageView!
@IBOutlet weak var imageView: UIImageView!
@IBOutlet weak var actionButton: UIBarButtonItem!
let bottomTextFieldDelegate = BottomTextFieldDelegate()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
topTextField.text = "TOP"
bottomTextField.text = "BOTTOM"
topTextField.delegate = self
bottomTextField.delegate = self.bottomTextFieldDelegate
}
func textFieldDidBeginEditing(_ textField: UITextField) {
topTextField.text = ""
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
self.view.endEditing(true)
textField.resignFirstResponder()
actionButton.isEnabled = true
return true
}
@IBAction func shareAction(_ sender: Any) {
let image = generateMemedImage()
let controller = UIActivityViewController(activityItems: [image as Any], applicationActivities: nil)
self.present(controller, animated: true, completion: nil)
controller.completionWithItemsHandler = {(activityType: UIActivityType?, completed:Bool, returnedItems:[Any]?, error: Error?) in
if !completed {
debugPrint("cancelled")
return
}else{
self.save()
self.dismiss(animated: true, completion: nil)
}
}
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
cameraButton.isEnabled = UIImagePickerController.isSourceTypeAvailable(.camera)
configureTextField(textField: topTextField)
configureTextField(textField: bottomTextField)
topTextField.textAlignment = .center
bottomTextField.textAlignment = .center
subscribeToKeyboardNotifications()
actionButton.isEnabled = false
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
unsubscribeFromKeyboardNotifications()
}
func configureTextField(textField: UITextField) {
textField.defaultTextAttributes = memeTextAttributes
}
func save() -> Meme {
// Create the meme
let memedImage = generateMemedImage()
let meme = Meme(topText: topTextField.text!, bottomText: bottomTextField.text!, originalImage: imageView.image!, memedImage: memedImage)
return meme
}
func generateMemedImage() -> UIImage {
// TODO: Hide toolbar and navbar
navigationController?.setToolbarHidden(true, animated: true)
self.navigationController?.isNavigationBarHidden = true
// Render view to an image
UIGraphicsBeginImageContext(self.view.frame.size)
view.drawHierarchy(in: self.view.frame, afterScreenUpdates: true)
let memedImage:UIImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
// TODO: Show toolbar and navbar
navigationController?.setToolbarHidden(false, animated: false)
self.navigationController?.isNavigationBarHidden = false
return memedImage
}
func keyboardWillShow(_ notification:Notification) {
view.frame.origin.y = 0 - getKeyboardHeight(notification)
}
func keyboardWillHide(_ notification:Notification) {
view.frame.origin.y = 0
}
func getKeyboardHeight(_ notification:Notification) -> CGFloat { //getting the height of keyboard and use it for func keyboardWillShow to relocate
//the keyboard using keyboardWillShow function
let userInfo = notification.userInfo
let keyboardSize = userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue // of CGRect
return keyboardSize.cgRectValue.height
}
func subscribeToKeyboardNotifications() { //setting up the obeserver to be notified when keyboard is shown or not, then execute keyboardWillShow function
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(_:)), name: .UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(_:)), name: .UIKeyboardWillHide, object: nil)
}
func unsubscribeFromKeyboardNotifications() { //unsubscribe the notification
NotificationCenter.default.removeObserver(self, name: .UIKeyboardWillShow, object: nil)
NotificationCenter.default.removeObserver(self, name: .UIKeyboardWillHide, object: nil)
}
//setting the arributes of the text
let memeTextAttributes:[String:Any] = [
NSStrokeColorAttributeName: UIColor.black,
NSForegroundColorAttributeName: UIColor.white,
NSFontAttributeName: UIFont(name: "HelveticaNeue-CondensedBlack", size: 40)!,
NSStrokeWidthAttributeName: 3,]
@IBAction func pickAnImageFromAlbum(_ sender: Any) {
let imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = .photoLibrary
present(imagePicker, animated: true, completion: nil)
}
@IBAction func pickAnImageFromCamera(_ sender: Any) {
let imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = .camera
present(imagePicker, animated: true, completion: nil)
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
if let image = info[UIImagePickerControllerOriginalImage] as? UIImage {
imagePickerView.image = image
imagePickerView.contentMode = .scaleAspectFit
dismiss(animated: true, completion: nil)
}
}
func imagePickerControllerDidCancel(_ picker: UIImagePickerController){
dismiss(animated: true, completion: nil)
}
}
BottomFieldDelegate:
导入基金会 导入UIKit
class BottomTextFieldDelegate:NSObject,UITextFieldDelegate {
func textFieldDidBeginEditing(_ textField: UITextField) {
textField.text = ""
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
let viewController = ViewController()
textField.resignFirstResponder()
viewController.view.endEditing(true)
let actionButton = viewController.actionButton
actionButton?.isEnabled = true
return true
}
}
答案 0 :(得分:1)
首先,您需要将此函数(如save()和generateMemedImage())移动到ViewController类中,然后您可以访问topTextField.text和lowTextField.text
修改你的结构,如下所示,不要将nsobject放在struct
中struct Meme {
var topText: String
var bottomText: String
var memedImage: UIImage
var originalImage: UIImage
init(topText: String, bottomText: String, originalImage: UIImage, memedImage: UIImage) {
self.topText = topText
self.bottomText = bottomText
self.originalImage = originalImage
self.memedImage = memedImage
}
}
从Meme结构中删除save()并将该代码放入Viewcontroller文件中。 修改返回Meme结构对象的函数。
func save() -> Meme {
// Create the meme
let meme = Meme(topText: topTextField.text!, bottomText: bottomTextField.text!, originalImage: imageView.image!, memedImage: memedImage)
return meme
}
你可以像下面那样存储在数组中。
let array:[Meme] = []
array.append(save())