我目前正在为Swift中的iOS编写照片应用。我使用CoreImage Framework在用户选择的UIImageView
上生成像素效果。但是,我在保存" pixeled"图像到iPhone的相机胶卷。通常我用
UIImageWriteToSavedPhotosAlbum(pixeledImage,nil,nil,nil)
但它没有保存UIImage
。我已让应用程序完全访问设备上的照片库。如果有人能帮我解决这个问题会很有帮助。我的图片选择器:
class ViewController: UIViewController,UIImagePickerControllerDelegate,UINavigationControllerDelegate {
var imagetobepassed: UIImage!
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
@IBAction func Cameratapped(sender: AnyObject) {
var camera = UIImagePickerController()
dispatch_async(dispatch_get_main_queue()) {
camera.delegate = self
camera.sourceType = UIImagePickerControllerSourceType.Camera
camera.allowsEditing = false
self.presentViewController(camera, animated: true, completion: nil)
}
}
@IBAction func photolib(sender: AnyObject) {
var photo = UIImagePickerController()
dispatch_async(dispatch_get_main_queue()) {
photo.delegate = self
photo.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
photo.allowsEditing = false
self.presentViewController(photo, animated: true, completion: nil)
}
}
func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!) {
imagetobepassed = image
self.dismissViewControllerAnimated(true, completion: nil)
}
@IBAction func editorPressed(sender: AnyObject) {
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "image" {
var editorview = segue.destinationViewController as! EditorViewController
editorview.imagerecived = imagetobepassed
}
}
}
我的编辑:
import UIKit
class EditorViewController: UIViewController {
var imagerecived:UIImage!
var pixeledImage:UIImage!
var savedImage:UIImage!
@IBOutlet var imageview: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
pixel()
}
// this function will prduce the pixel effect
func pixel() {
var regularImage = CIImage(image: imagerecived)
var filter = CIFilter(name: "CIPixellate")
filter.setDefaults()
filter.setValue(regularImage, forKey: kCIInputImageKey)
var output = filter.outputImage
pixeledImage = UIImage(CIImage: output)
imageview.image = pixeledImage
}
@IBAction func SaveTapped(sender: AnyObject) {
println(pixeledImage)
UIImageWriteToSavedPhotosAlbum(pixeledImage,nil,nil,nil) // not saving image
}
我该如何使这项工作?我确实看到了这个错误:
2015-05-16 23:40:05.416 Pixelate2 [21579:3341726]与assetsd的连接 被打断或资产已经死亡
答案 0 :(得分:1)
首先使用此行保存图像: -
UIImageWriteToSavedPhotosAlbum(pixeledImage, self, "image:didFinishSavingWithError:contextInfo:", nil)
现在实现此方法,以捕获您获得的错误: -
func image(image: UIImage, didFinishSavingWithError error: NSError?, contextInfo:UnsafePointer<Void>) {
if error == nil {
}
else
{
//log the error out here ,if any
}
}
如果你得到记忆警告,还有另外一项工作!
ALAssetsLibrary* lib = [[ALAssetsLibrary alloc] init];
[lib writeImageDataToSavedPhotosAlbum:imageData metadata:nil
completionBlock:^(NSURL *assetURL, NSError *error)
{
// do whatever in the completion handler
}];
答案 1 :(得分:1)
我能够使用此代码解决问题:
@IBAction func SaveTapped(sender: AnyObject) {
let softwareContext = CIContext(options: [kCIContextUseSoftwareRenderer:true])
let cgimg = softwareContext.createCGImage(savedImage,
fromRect: savedImage.extent())
let libary = ALAssetsLibrary()
libary.writeImageToSavedPhotosAlbum(cgimg, metadata: savedImage.properties(),
completionBlock: nil)
}