Question

我正在尝试为我的高级设计项目制作滑动拼图应用程序。该应用程序包括选择或拍摄照片（我已经想到），然后让应用程序将图像切割成9件（裁剪图像）并将它们存储在一个数组中，然后删除一个，并以随机顺序显示它们屏幕。最后，用户触摸或滑动瓷砖，直到它们以正确的顺序排列。

我在网上找到了各种代码示例，但没有用Swift编写。当我试图解释我发现的旧代码并在Swift中重新编写代码时，我会遇到各种错误......我是一名学生新手。

我一直在尝试使用CGSizeMake，CGRectMake和CGImageCreateWithImageInRect从displayImageView中显示的用户选择的图像创建新的裁剪图像，然后将这些新的裁剪图像片段存储在tileStack数组中。但是，我想我错过了一些东西......也许我错过了很多东西。

这是一个screenshot of the error when I run it。

//PhotoViewController.swift Created by Jim on 2/18/16. Copyright © 2016 JamesDphoto.com. All rights reserved.

import UIKit import Foundation

class PhotoViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

    var tileStack = [AnyObject]();

     //Beginning of simple image selection and display     
    @IBOutlet weak var displayImageView: UIImageView!

    @IBAction func choosePicFromLibrary(sender: AnyObject) {
        let imagePicker: UIImagePickerController = UIImagePickerController()

        imagePicker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
        imagePicker.delegate = self
        imagePicker.modalPresentationStyle = UIModalPresentationStyle.Popover

        if (imagePicker.popoverPresentationController != nil) {
            imagePicker.popoverPresentationController!.sourceView = sender as! UIButton
            imagePicker.popoverPresentationController!.sourceRect = (sender as! UIButton).bounds
        }
        presentViewController(imagePicker, animated: true, completion: nil)
    }   
    @IBAction func takePhoto(sender: AnyObject) {
        let imagePicker: UIImagePickerController = UIImagePickerController()

        imagePicker.sourceType = UIImagePickerControllerSourceType.Camera
        imagePicker.delegate = self
        imagePicker.modalPresentationStyle = UIModalPresentationStyle.Popover

        if (imagePicker.popoverPresentationController != nil) {
            imagePicker.popoverPresentationController!.sourceView = sender as! UIButton
            imagePicker.popoverPresentationController!.sourceRect = (sender as! UIButton).bounds
        }
        presentViewController(imagePicker, animated: true, completion: nil)
    }

    func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
        dismissViewControllerAnimated(true, completion: nil)
        displayImageView.image = info[UIImagePickerControllerOriginalImage] as! UIImage!
    }

    func imagePickerControllerDidCancel(picker: UIImagePickerController) {
        dismissViewControllerAnimated(true, completion: nil)
    }


     //Beginning of function to cut photo into 9 tiles, then randomize them.

    //cut into 9 tiles and add to tileStack array
    @IBAction func randomize(sender: AnyObject) {

    let tileSize = CGSizeMake(displayImageView.image!.size.width/3, displayImageView.image!.size.height/3)

        for var rowI = 0; rowI < 3; rowI++
        {
            for var colI = 0; colI < 3; colI++
            {
                let tileRect = CGRectMake(CGFloat(rowI) * tileSize.width, tileSize.height * CGFloat(colI), tileSize.width, tileSize.height)

                let tileImage = CGImageCreateWithImageInRect(displayImageView.image as! CGImage!, tileRect)
                tileStack.append(tileImage!)
            }
        }   
        //display tiles in order on screen
    }

    /*
    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        // Get the new view controller using segue.destinationViewController.
        // Pass the selected object to the new view controller.
    }
    */

}

Answer 1

您正在尝试隐式地将UIImage对象转换为CGImage。这就是你的应用程序崩溃的原因，只有当你确定displaImageView.image不是nil时才尝试这个。

let tileImage = CGImageCreateWithImageInRect(displayImageView.image!.CGImage, tileRect)

我更喜欢

if let dpimage = displayImageView.image
{
 let tileImage = CGImageCreateWithImageInRect(dpimage.CGImage, tileRect)
}

Swift中的iOS滑动拼图

1 个答案: