Question

我的项目在运行我的应用程序时遇到一个构建错误。我在这里的代码中确实没有错误，但错误是在＆＃34; activity.completionWithItemsHandler＆＃34;开始。有什么需要改变的建议吗？谢谢你的帮助。这是我的代码：

//
//  MemeEditorViewController.swift
//  MemeMe
//
//  Created by Humberto Aquino on 4/3/15.
//  Copyright (c) 2015 Humberto Aquino. All rights reserved.
//

import UIKit

// Meme editor view. Memes can use the photo library or the camera (is       supported)
// When ready, the meme can be shared
class MemeEditorViewController: UIViewController,     UIImagePickerControllerDelegate, UINavigationControllerDelegate, UITextFieldDelegate {

// Meme text and image
@IBOutlet weak var topTextField: UITextField!
@IBOutlet weak var bottomTextField: UITextField!
@IBOutlet weak var imageView: UIImageView!

// Top bar
@IBOutlet weak var navigationBar: UINavigationBar!
@IBOutlet weak var cameraButton: UIBarButtonItem!
@IBOutlet weak var shareButton: UIBarButtonItem!

// Bottom bar
@IBOutlet weak var toolBar: UIToolbar!

// Existing meme reference. Used only when the editor will edit an existing meme
var meme: Meme?


// MARK: -
// MARK: View life cycle

override func viewDidLoad() {
    super.viewDidLoad()

    if let existingMeme = meme {
        // Existing meme. Use self.meme
        setupTextField(existingMeme.top, textField: topTextField)
        setupTextField(existingMeme.bottom, textField: bottomTextField)
        imageView.image = existingMeme.image
        shareButton.enabled = true
    } else {
        // New meme. self.meme is not used
        setupTextField("TOP", textField: topTextField)
        setupTextField("BOTTOM", textField: bottomTextField)
        shareButton.enabled = false
    }
}

override func viewWillAppear(animated: Bool) {
    // Enable the camera button if is supported by the device
    cameraButton.enabled = UIImagePickerController.isSourceTypeAvailable(.Camera)
    subscribeToKeyboardNotifications()
}

override func viewWillDisappear(animated: Bool) {
    super.viewWillDisappear(animated)
    unsubscribeToKeyboardNotifications()
}

// MARK: -
// MARK: NSNotification subscriptions and selectors

func subscribeToKeyboardNotifications() {
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillShow:", name: UIKeyboardWillShowNotification, object: nil)
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillHide:", name: UIKeyboardWillHideNotification, object: nil)

}

func unsubscribeToKeyboardNotifications() {
    NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillShowNotification, object: nil)
    NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillHideNotification, object: nil)
}

func keyboardWillShow(notification: NSNotification) {
    if bottomTextField.isFirstResponder() {
        self.view.frame.origin.y -= getKeyboardHeight(notification)
    }
}

func keyboardWillHide(notification: NSNotification) {
    if bottomTextField.isFirstResponder() {
        self.view.frame.origin.y += getKeyboardHeight(notification)
    }
}

func getKeyboardHeight(notification: NSNotification) -> CGFloat {
    let userInfo = notification.userInfo
    let keyboardSize = userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue
    return keyboardSize.CGRectValue().height
}

// MARK: -
// MARK: UITextFieldDelegate

func textFieldDidBeginEditing(textField: UITextField) {
    // When a user taps inside a textfield, the default text should clear.
    textField.text = ""
}

func textFieldShouldReturn(textField: UITextField) -> Bool {
    // When a user presses return, the keyboard should be dismissed
    textField.resignFirstResponder()
    return true
}

// MARK: -
// MARK: UIImagePickerControllerDelegate

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

    if let originalImage = info[UIImagePickerControllerOriginalImage] as? UIImage {
        imageView.image = originalImage
        // Enable share button now that we have an image
        shareButton.enabled = true
    }

    dismissViewControllerAnimated(true, completion: nil)
}

// MARK: -
// MARK: Actions

@IBAction func cancelMeme(sender: UIBarButtonItem) {
    dismissViewControllerAnimated(true, completion: nil)
}

@IBAction func shareMeme(sender: UIBarButtonItem) {
    //  generate a memed image
    let memedImage = generateMemedImage()

    // define an instance of the ActivityViewController
    // pass the ActivityViewController a memedImage as an activity item
    let activity = UIActivityViewController(activityItems: [memedImage], applicationActivities: nil)

    activity.completionWithItemsHandler = { (activityType: String!, completed: Bool, returnedItems: [AnyObject]!, activityError: NSError!) -> Void in
        if completed {
            // Save meme and dismiss
            self.saveMeme(memedImage)
            activity.dismissViewControllerAnimated(true, completion: nil)
            self.dismissViewControllerAnimated(true, completion: nil)
        }
    }

    // present the ActivityViewController
    presentViewController(activity, animated: true, completion: nil)
}

@IBAction func pickAnImageFromAlbum(sender: UIBarButtonItem) {
    presentImagePickerOfType(.PhotoLibrary)
}

@IBAction func pickAnImageFromCamera(sender: UIBarButtonItem) {
    presentImagePickerOfType(.Camera)
}

// MARK: -
// MARK: Utility methods

// Setup Text filed to approximate to the "Impact" font, all caps, white with a black outline
func setupTextField(string: String, textField: UITextField) {
    let memeTextAttributes = [
        NSStrokeColorAttributeName : UIColor.blackColor(),
        NSForegroundColorAttributeName : UIColor.whiteColor(),
        NSFontAttributeName : UIFont(name: "HelveticaNeue-CondensedBlack", size: 40)!,
        NSStrokeWidthAttributeName : -3
    ]

    let attributedString = NSAttributedString(string: string, attributes: memeTextAttributes)
    textField.attributedText = attributedString
    textField.defaultTextAttributes = memeTextAttributes
    // Text should be center-aligned
    textField.textAlignment = .Center
    textField.delegate = self
}

// Present the image picker depending on the specified sourceType
func presentImagePickerOfType(sourceType: UIImagePickerControllerSourceType) {
    let imagePickerController = UIImagePickerController()
    imagePickerController.delegate = self
    imagePickerController.sourceType = sourceType
    presentViewController(imagePickerController, animated: true, completion: nil)
}

func toolbarVisible(visible: Bool) {
    toolBar.hidden = !visible
    navigationBar.hidden = !visible
}

func generateMemedImage() -> UIImage {
    // hide toolbar
    toolbarVisible(false)

    // Render view to image
    UIGraphicsBeginImageContext(self.view.frame.size)
    self.view.drawViewHierarchyInRect(self.view.frame, afterScreenUpdates: true)
    let memedImage: UIImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()

    // show toolbar
    toolbarVisible(true)

    return memedImage
}

// Saves the meme correctly. Is the meme is new it saves a new one in the shared model
// If the meme already exists the method only updates its values
func saveMeme(memedImage: UIImage) {
    if let existingMeme = meme {
        // Meme exists. Just change its existing properties
        existingMeme.top = topTextField.text!
        existingMeme.bottom = bottomTextField.text!
        existingMeme.image = imageView.image!
        existingMeme.memedImage = memedImage
    } else {
        // New meme. Create one and add it to the sahred model
        let meme = Meme(top: topTextField.text!, bottom: bottomTextField.text!, image: imageView.image!, memedImage: memedImage)
        // Add the saved meme to the shared model
        MemeManager.sharedInstance.appendMeme(meme)
    }
}

}

Answer 1

根据您到目前为止发布的信息（截至此回答以及我对您的问题的评论不完整且不准确），我看到您将完成处理程序关闭的参数指定为当文档说他们是可选的（!）时需要（?）。我不确定，但我相信它不会让你分配关闭，因为你的关闭的签名不匹配UIActivityViewController＆＃39;期望。

无法指定类型的值

1 个答案: