我正在开发一个应用程序，在当前阶段，当用户拍照时，照片将存储在应用程序的本地。

 @IBAction func CameraAction(sender: UIButton) {
let picker = UIImagePickerController()
    picker.delegate = self
    picker.sourceType = .Camera
    picker.allowsEditing = true
    self.presentViewController(picker, animated: true, completion: nil)
}

func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage, editingInfo: [String : AnyObject]?) {
    picker.dismissViewControllerAnimated(true, completion: nil)

    //Save image
    let img = UIImage()
    let data = UIImagePNGRepresentation(img)
    NSUserDefaults.standardUserDefaults().setObject(data, forKey: "myImageKey")
    NSUserDefaults.standardUserDefaults().synchronize()
    NSLog("Image stored?")
    viewDidLoad()


}

根据我上面的内容，我的 iPhone 打开了相机，我可以拍照了。当我点击捕获和“使用此图像”选项时，我认为图片实际上并没有被存储，因为我无法记忆起这些图片。

所以我寻求帮助，了解如何在本地存储从 UIImagePickerController 拍摄的图片(可能在文档文件夹中)、如何调用它以及如何在没有 NSUserDEfaults 的情况下。谢谢。

最佳答案

这是在 NSUserDefaults 中存储图像的方式:

As I mentioned in my comment, this is not recommended and, if used for more than one image, may result in serious performance loss and even crashes.

let image = UIImage(named: "myImage")
let pngImage = UIImagePNGRepresentation(image) 
            
NSUserDefaults.standardUserDefaults().setObject(pngImage, forKey: "image")
            
            

并检索图像:

var retrievedImage = NSUserDefaults.standardUserDefaults().objectForKey("image") as! AnyObject

然后，显示图像:

imageView.image = UIImage(data: retrievedImage as! NSData)

This is how to store an image to a file (much better):

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
    
}

你可以这样调用它:

saveImage(image, path: imagePath)

然后，要检索图像，请使用此函数:

func loadImageFromPath(path: String) -> UIImage? {
    
    let image = UIImage(contentsOfFile: path)
    
    if image == nil {
        
        print("missing image at: \(path)")
    }
    print("Loading image from path: \(path)") // this is just for you to see the path in case you want to go to the directory, using Finder.
    return image
    
}

你可以这样调用它:

image = loadImageFromPath(imagePath)
        imageView.image = image

有关更多详细信息，请查看 http://helpmecodeswift.com/image-manipulation/saving-loading-images

Also, you don't actually use the image that gets selected in your example, as Frederik pointed out.

You save an empty variable 'img' that has not been assigned to. You need to save 'image', the variable you get back after the picker has finished.

获取图像的方法如下:

这个函数返回变量'image'

func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage, editingInfo: [String : AnyObject]?) {
picker.dismissViewControllerAnimated(true, completion: nil)

You can then go ahead and just use it e.g.

imageView.image = image  

或者也许

 saveImage(image, path: imagePath)  

祝你好运!

关于ios - 如何用swift拍照并保存到app本地，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/37979140/