"Save Photos in Photo albums of iPhone or iPad using Xamarin Forms" 但是 PCL 已弃用

Question

我正在尝试解决 Stack Overflow Post“ post PCL 的答案中已弃用。什么是更新的答案？谢谢。

Answer 1

However in the answer for the post PCL is deprecated.

实际上，您只需要在共享项目中做同样的事情。 DependencyService 在 Xamarin.Forms 中可用，您可以参考 https://docs.microsoft.com/en-us/xamarin/xamarin-forms/app-fundamentals/dependency-service/introduction .

在表格中

public interface ISavePhotosToAlbum
{
    void SavePhotosWithStream(string name, Stream data);
}

在iOS

[assembly: Dependency(typeof(SaveToAlbum))]
namespace xxx.iOS
{
    public class SaveToAlbum : ISavePhotosToAlbum
    {
        public void SavePhotosWithStream(string name,Stream stream)
        {
            var imageData = NSData.FromStream(stream);
            var image = UIImage.LoadFromData(imageData);

            image.SaveToPhotosAlbum((img, error) =>
            {

            });
        }
    }
}

并在info.plist

中添加如下代码

<key>NSCameraUsageDescription</key>
<string>App need to access your camera</string>
<key>NSPhotoLibraryAddUsageDescription</key>
<string>App need to access your albums</string>  // new in iOS 11 and later
<key>NSPhotoLibraryUsageDescription</key>
<string>App need to access your albums</string>

此外，如果您想在Android

中实现它

在Android

[assembly: Dependency(typeof(SaveToAlbum))]
namespace xxx.Droid
{
    public class SaveToAlbum : ISavePhotosToAlbum
    {
        public void SavePhotosWithStream(string name,Stream stream)
        {
            var documentsPath = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
            documentsPath = Path.Combine(documentsPath, "Orders", temp);
            Directory.CreateDirectory(documentsPath);

            string filePath = Path.Combine(documentsPath, name);

            byte[] bArray = new byte[data.Length];
            using (FileStream fs = new FileStream(filePath , FileMode.OpenOrCreate))
            {
                using (data)
                {
                    data.Read(bArray, 0, (int)data.Length);
                }
                int length = bArray.Length;
                fs.Write(bArray, 0, length);
            }
        }
    }
}