如何保存用UIImagePickerController相机拍摄的照片以稍后在应用程序中显示？ [英] How can I save a photo taken with UIImagePickerController camera to be displayed later in the app?

问题描述

我正在让用户使用UIImagePickerController拍摄照片，我需要将其保存到应用程序中，以便在以后需要查看时可以显示它。我该怎么做？

I am having the user take a photo with UIImagePickerController and I need it to be saved to the app so that it can be displayed when they need to see it later. How can I accomplish this?

我听说NSUserDefaults是一个错误。我需要保存的只是一个图像，再也没有。

I have heard NSUserDefaults would be a mistake. All I need to save is a single image, never more.

推荐答案

这里是将图像保存到文档文件夹的功能

Here is the function to save your image to document folder

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
    }

这里是获取函数具有图像名称的文档目录路径

Here is the function to get your document directory path with image name

func fileInDocumentsDirectory(filename: String) -> String {
    let documentsFolderPath = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0] as! String
    return documentsFolderPath.stringByAppendingPathComponent(filename)
}

这里是一个示例如何使用图像路径

Here is an example of how to use your image path

let imagePath = fileInDocumentsDirectory(myImageName)

这是将图片保存到该文件夹​​的方式

And here is how you save your image to that folder

saveImage(image, path: imagePath)

现在最后一部分是获取图像，因此使用此功能获取图像

Now the last part is to get your image, so use this function to get your image

func loadImageFromPath(path: String) -> UIImage? {
    let image = UIImage(contentsOfFile: path)
    if image == nil {
        println("Image not available at: (path)")
    }
    return image
}

这是使用上述功能的方式

And here is how you use the above function

image = loadImageFromPath(imagePath)
imageView.image = image

希望这对您有帮助

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