问题描述
我使用 UIImagePickerController 从手机库 (iOS) 中获取图像.在编辑模式之后，我将图像放到我的 UIImageView 中.我想将此图像保存在 Core Data 中以在另一个视图控制器中使用它
I use UIImagePickerController to get image from phone library (iOS). After edit mode i put image to my UIImageView. I want to save this image in Core Data to use it in another View Controllers
我如何在 Swift 中做到这一点.如果不可能，我必须使用哪些选项来保存图像?
How can i do it in Swift. If it is not possible what options do i have to save image ?
推荐答案
另一个不错的选择是您可以将图像保存到应用程序的文档目录中，您可以从任何地方检索该图像，如下面的代码所示:
Another good option is you can save your Image into Document Directory of your app and you can retrieve that image from anywhere like shown in below code:
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
self.dismissViewControllerAnimated(true, completion: nil)
let tempImage = info[UIImagePickerControllerOriginalImage] as! UIImage
// save your image here into Document Directory
saveImage(tempImage, path: fileInDocumentsDirectory("tempImage"))
}
这里是辅助函数:
func saveImage (image: UIImage, path: String ) -> Bool{
let pngImageData = UIImagePNGRepresentation(image)
//let jpgImageData = UIImageJPEGRepresentation(image, 1.0) // if you want to save as JPEG
let result = pngImageData.writeToFile(path, atomically: true)
return result
}
// Get the documents Directory
func documentsDirectory() -> String {
let documentsFolderPath = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0] as! String
return documentsFolderPath
}
// Get path for a file in the directory
func fileInDocumentsDirectory(filename: String) -> String {
return documentsDirectory().stringByAppendingPathComponent(filename)
}
这样您就可以从文档目录中检索该图像:
And this way you can retrieve that image from Document Directory:
@IBAction func setImage(sender: AnyObject) {
imageV.image = loadImageFromPath(fileInDocumentsDirectory("tempImage"))
}
这里是辅助函数:
func loadImageFromPath(path: String) -> UIImage? {
let image = UIImage(contentsOfFile: path)
if image == nil {
println("missing image at: (path)")
}
println("(path)") // this is just for you to see the path in case you want to go to the directory, using Finder.
return image
}
希望对你有所帮助.
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