我得到的四个错误是
1：Use of undeclared type 'MemeImage' - Line 46
2：Binary Operator '*' cannot be applied to operands of type '()' and 'Int' - Line 85
3：Unexpected non-void return value in void function - Line 113
4：Use of local variable 'makeMemedImage' before its declaration - Line 169
代码：
import UIKit
class ViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate, UITextFieldDelegate {
// Top of the storyboard
@IBOutlet weak var topBar: UIToolbar!
@IBOutlet weak var shareBtn: UIBarButtonItem!
@IBOutlet weak var cancelBtn: UIBarButtonItem!
// Middle of the storyboard
@IBOutlet weak var topTextField: UITextField!
@IBOutlet weak var imageView: UIImageView!
@IBOutlet weak var bottomTextField: UITextField!
// Bottom of the storyboard
@IBOutlet weak var bottomBar: UIToolbar!
@IBOutlet weak var cameraBtn: UIBarButtonItem!
@IBOutlet weak var albumBtn: UIBarButtonItem!
// text attributes
let topTextDefault = "TOP TEXT"
let bottomTextDefault = "BOTTOM TEXT"
let noText = ""
let topTextDelegate = TopTextDelegate()
let bottomTextDelegate = BottomTextDelegate()
// meme attributes
let memeTextAttributes:[String: Any] = [NSStrokeColorAttributeName: UIColor.black, NSForegroundColorAttributeName: UIColor.white, NSFontAttributeName: UIFont( name: "HelveticaNeue-CondensedBlack", size: 40 )!, NSStrokeWidthAttributeName: NSNumber( value: -4.0 )]
var isKeyboardVisible = false
// Use of undeclared type 'MemeImage'
var meme: MemeImage!
override func viewDidLoad() {
super.viewDidLoad()
imageView.contentMode = UIViewContentMode.scaleAspectFit
}
override func viewDidAppear(_ animated: Bool) {
cameraBtn.isEnabled = UIImagePickerController.isSourceTypeAvailable(.camera)
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.subscribeToKeyboardNotifications()
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
unsubscribeFromKeyboardNotifications()
}
func initTextFields(textField: UITextField, initialText: String, delegate: UITextFieldDelegate) {
textField.defaultTextAttributes = memeTextAttributes
textField.textAlignment = NSTextAlignment.center
textField.text = initialText
textField.delegate = delegate
}
func keyboardWillShow(_ notification:Notification) {
if bottomTextField.isFirstResponder {
// Binary Operator '*' cannot be applied to operands of ttype '()' and 'Int' -----------
view.frame.origin.y = getKeyboardHeight(notification) * -1
}
}
func keyboardWillHide(_ notification:Notification) {
if bottomTextField.isFirstResponder {
view.frame.origin.y = 0.0
}
}
func subscribeToKeyboardNotifications() {
NotificationCenter.default.addObserver( self, selector: #selector(keyboardWillShow(_:)), name: .UIKeyboardWillShow, object: nil )
NotificationCenter.default.addObserver( self, selector: #selector(keyboardWillHide(_:)), name: .UIKeyboardWillHide, object: nil )
}
func unsubscribeFromKeyboardNotifications() {
NotificationCenter.default.removeObserver( self, name: .UIKeyboardWillShow, object: nil )
NotificationCenter.default.removeObserver( self, name: .UIKeyboardWillHide, object: nil )
}
func getKeyboardHeight(_ notification:Notification) {
let userInfo = notification.userInfo
let keyboardSize = userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue
// Unexpected non-void return value in void function---------
return keyboardSize.cgRectValue.height
}
func imagePickCancel(_ picker: UIImagePickerController) {
dismiss(animated: true, completion: nil)
}
func imageWasPicked(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
if let image = info[UIImagePickerControllerOriginalImage] as? UIImage {
imageView.contentMode = .scaleAspectFit
imageView.image = image
shareBtn.isEnabled = true
cancelBtn.isEnabled = true
} else {
dismiss(animated: true, completion: nil)
}
}
func pickImageType(sourceType: UIImagePickerControllerSourceType) {
let pickerController = UIImagePickerController()
pickerController.delegate = self
pickerController.sourceType = sourceType
self.present( pickerController, animated: true, completion: nil)
}
@IBAction func getImageFromCamera(_ sender: Any) {
pickImageType(sourceType: UIImagePickerControllerSourceType.camera)
}
@IBAction func getImageFromAlbum(_ sender: Any) {
pickImageType(sourceType: UIImagePickerControllerSourceType.photoLibrary)
}
@IBAction func cancel(_ sender: Any) {
shareBtn.isEnabled = false
imageView.image = nil
topTextField.text = topTextDefault
bottomTextField.text = bottomTextDefault
meme = nil
}
@IBAction func share(_ sender: Any) {
// Use of local variable 'makeMemedImage' before its declaration ------------
let memedImage = makeMemedImage()
let socialController = UIActivityViewController( activityItems: [memedImage], applicationActivities: nil )
socialController.completionWithItemsHandler = {
UIActivityType, completion, items, error in
if completion {
self.saveMemedImage(memedImage: memedImage) {
}
} else {
self.dismiss( animated: true, completion: nil )
}
self.present(socialController, animated: true, completion: nil)
}
func makeMemedImage() -> UIImage {
topBar.isHidden = true
bottomBar.isHidden = true
UIGraphicsBeginImageContext(self.view.frame.size)
view.drawHierarchy( in: self.view.frame, afterScreenUpdates: true )
let memedImage:UIImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
topBar.isHidden = false
bottomBar.isHidden = false
return memedImage
}
func save() {
self.meme = memedImage.init(topText: self.txtTop.text!, bottomText: self.txtBottom.text!, origImage: self.imgView.image!, memedImage: memedImage)
}
}
}
答案 0 :(得分：0)
主要是错误信息是自我解释...
1：使用未声明类型'MemeImage'
你的项目中没有MemeImage类（可能是拼写错误？）
2：二进制运算符'*'不能应用于'（）'和'Int'类型的操作数
函数没有返回任何内容，这就是为什么你不能在这里使用*（用答案3修复）
3：void函数中出现意外的非void返回值
函数声明没有声明的返回值
func getKeyboardHeight(_ notification:Notification) {
更改为Int或您在此处返回的任何内容：
func getKeyboardHeight(_ notification:Notification) -> Int {
4：在声明之前使用局部变量'makeMemedImage'
我发现函数makeMemedImage处于错误的级别
解决方案A （未经推荐 - 但可以解决错误消息）
如果您希望将其作为@IBAction func share(_ sender: Any) {内的函数使用，那么您需要将此块移动到第一次使用
解决方案B （推荐 - 更好的编码风格，只有当您需要一个非常特殊的情况然后内联函数时）
将函数func makeMemedImage（以及其他func save）的嵌套级别更改为@IBAction func share之外。将}从func save { ... }之后的行移至 func makeMemedImage`之前的一行
答案 1 :(得分：0)
我只是将它粘贴到一个操场上，然后错误弹出。我猜这个代码是从某些来源复制和粘贴的，几乎没有尝试实际修复它，即，甚至没有所有的括号配对（错误＃4）。
完全意味着它的含义。它无法在项目中的任何位置找到名为MemeImage的类。该课程是否存在？
getKeyboardHeight是一个不会声明其返回类型的函数（这也是错误＃3的原因）。所以你试图乘以一个函数。
参见＃2
您错过了}函数与share函数之间的结束makeMemedImage。