如何保存从Swift中的UIImagePickerController中拾取的图像？ [英] How to save an image picked from a UIImagePickerController in Swift?

问题描述

我正在构建一个应用程序，让用户从其照片库中选择一个图像。我正在使用此代码来保存它。

I'm building an app where I let the user to pick an image from its photo library. I was using this code to save it.

func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage, editingInfo: [String : AnyObject]?) {
    imgPicker.dismissViewControllerAnimated(true, completion: nil)
    NSUserDefaults.standardUserDefaults().setValue(image, forKey: "bgImage")
}

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

我后来发现你无法使用NSUserDefaults保存图像，但是你可以保存拾取图像的路径，保存它并加载if let ...

I later figured out that you can't save the image with NSUserDefaults, but you can save the picked image's path, save it and load it with "if let..."

但我不知道该怎么做（找到路径并保存）。这个想法是让用户选择视图背景图像，有点像Whatsapp的作用。

But I don't know how to do this (find the path and save it). The idea is for the user to choose the view background image, kinda like how Whatsapp does.

如果我错了你不能存储路径，那么在不使用在线服务器的情况下保存所选图像的简单方法？

If I'm wrong and you can't store the path, is there any easy way to save the picked image without using online servers?

推荐答案

您可以使用NSUserDefaults保存和检索它：

You can save and retrieve it using NSUserDefaults:

//Save image
let img = UIImage() //Change to be from UIPicker
let data = UIImagePNGRepresentation(img)
NSUserDefaults.standardUserDefaults().setObject(data, forKey: "myImageKey")
NSUserDefaults.standardUserDefaults().synchronize()

//Get image
if let imgData = NSUserDefaults.standardUserDefaults().objectForKey("myImageKey") as? NSData {
    let retrievedImg = UIImage(data: imgData)
}

或你可以读/写文件，如果你愿意：

Or you can read / write to file, if you prefer:

//Save image
let img = UIImage() //Change to be from UIPicker
let data = UIImagePNGRepresentation(img)!
do {
    let documentsPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as String
    try data.writeToFile("\(documentsPath)myImage", options: [])

} catch {
    print("Error")
}

//Get image
do {
    let documentsPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as String
    let readData = try NSData(contentsOfFile: "\(documentsPath)myImage", options: [])
    let retreivedImage = UIImage(data: readData)
}
catch {
    print("Error")
}

Swift 3 ：

//Save image
let data = UIImagePNGRepresentation(pickedImage)!
do {
    let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as String
    try data.write(to: URL(string: "\(documentsPath)/myImage")!, options: .atomic)
} catch {
    print("Error")
}

//Get image
do {
    let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as String
    let readData = try Data(contentsOf: URL(string: "\(documentsPath)/myImage")!)
    let retreivedImage = UIImage(data: readData)
} catch {
    print("Error")
}

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