Unity 保存图片到手机相册（安卓、苹果）

首先说一下安卓：首先在相册里创建一个文件，然后将图片存入。

代码：

using UnityEngine;
using System.Collections;
using System.IO;

public class SavaPicture : MonoBehaviour {

	// Use this for initialization
	void Start () {
        //保存图片
        StartCoroutine(LoadImg());
    }
    IEnumerator LoadImg()
    {
        WWW www = new WWW("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1498635837686&di=cc15b088c3c1376d724891abd74736b1&imgtype=0&src=http%3A%2F%2Fk2.jsqq.net%2Fuploads%2Fallimg%2F1705%2F7_170524143440_5.jpg");
        yield return www;

        
        Texture2D texture2D = www.texture;
        byte[] bytes = texture2D.EncodeToPNG();
        string fileName = "二维码.png";
        string path;
       
        //安卓平台
        else if (Application.platform == RuntimePlatform.Android)
        {
            string destination = "/sdcard/DCIM/棋牌";
            //判断目录是否存在，不存在则会创建目录  
            if (!Directory.Exists(destination))
            {
                Directory.CreateDirectory(destination);
            }
            path = destination + "/" + fileName;
            //存图片  
            System.IO.File.WriteAllBytes(path, bytes);
        }
        //电脑端
        else
        {
            path = Application.dataPath + "/" + fileName;
            FileStream fs = new FileStream(path, FileMode.Create);
            fs.Write(bytes, 0, bytes.Length);
            fs.Flush();
            fs.Close();
        }
        Debug.Log(path);
    }
}

需要注意的是：打包的时候 配置一下：player Settings---->other Settings------>write Access------>External(SDCard)

下面说一下苹果：

PhotoManager.h 文件内容

#import 

@interface PhotoManager : NSObject
- ( void ) imageSaved: ( UIImage *) image didFinishSavingWithError:( NSError *)error
   contextInfo: ( void *) contextInfo;
@end

PhotoManager.mm  文件 内容如下

#import "PhotoManager.h"
@implementation PhotoManager
- ( void ) imageSaved: ( UIImage *) image didFinishSavingWithError:( NSError *)error
          contextInfo: ( void *) contextInfo
{
    NSLog(@"保存结束");
    if (error != nil) {
        NSLog(@"有错误");
    }
}
@end

extern "C" {
void _SavePhoto(char *readAddr)
{
    NSString *strReadAddr = [NSString stringWithUTF8String:readAddr];
    UIImage *img = [UIImage imageWithContentsOfFile:strReadAddr];
    PhotoManager *instance = [PhotoManager alloc];
    UIImageWriteToSavedPhotosAlbum(img, instance,
                                   @selector(imageSaved:didFinishSavingWithError:contextInfo:), nil);
}
}

需要注意：苹果打包的时候 我们需要打开info.plist文件添加相应权限的说明，否则程序在iOS10上会出现崩溃。或则打包出现错误。

添加相册权限：

相册权限： Privacy - Photo Library Usage Description 是否允许此App访问你的媒体资料库？

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