Unity中关于保存图片到Android/IOS相册中的问题

我们在一些项目中可能需要截图保存功能（特别是AR的一些项目），将截下来的图保存的相册中，从而实现分享功能。下面就Android和IOS说一下他们是如何将图片保存到本地图册的。

关于安卓端，保存到相册方法很简单，就是也路径的问题，具体方法如下：

public class takephoto : MonoBehaviour{    private int i = 0;    //UI    public GameObject[] btn;    //存储路径    private string Path_save;    //读取路径    private string Path_read;    private string filepath;    private string destination;    void Start()    {        filepath = Application.persistentDataPath + "/test.txt";    }    void OnClick()    {        StartCoroutine(getTexture2d());    }    IEnumerator getTexture2d()    {        //隐藏UI        for (int j = 0; j < btn.Length; j++)        {            btn[j].GetComponentInChildren<UISprite>().enabled = false;        }        //截图操作        yield return new WaitForEndOfFrame();        Texture2D t = new Texture2D(Screen.width, Screen.height,TextureFormat.RGB24,false);        //显示UI        for (int j = 0; j < btn.Length; j++)        {            btn[j].GetComponentInChildren<UISprite>().enabled = true;        }        t.ReadPixels(new Rect(0, 0, Screen.width, Screen.height), 0, 0, true);        byte[] bytes = t.EncodeToPNG();        t.Compress(true);        t.Apply();        //获取系统时间        System.DateTime now = new System.DateTime();        now = System.DateTime.Now;        string filename = string.Format("image{0}{1}{2}{3}.png", now.Day, now.Hour, now.Minute, now.Second);        //记录每一个截图名字        StreamWriter sw;        FileInfo ft = new FileInfo(filepath);        if (!ft.Exists)        {            sw = ft.CreateText();        }        else        {            sw = ft.AppendText();        }        sw.WriteLine(filename);        sw.Close();        sw.Dispose();        //应用平台判断，路径选择        if (Application.platform == RuntimePlatform.Android)        {            string origin = Path_save;            destination = "/mnt/sdcard/DCIM/ARphoto";            if (!Directory.Exists(destination))            {                Directory.CreateDirectory(destination);            }            destination = destination + "/" + filename;            Path_save = destination;               }        //保存文件        File.WriteAllBytes(Path_save, bytes);    }}

其中主要的就是安卓相册的一个路径问题，我是在相册路径下，新建了一个名叫ARphoto相册，所有保存下来的图片都保存在这个相册中，可以再图库应用中查看到这个相册文件夹。

在IOS端保存相册是无法单独在Unity中完成的。需要调用Xcode中的方法，关于Unity与Xcode之间的交互有什么疑问的可以查看我之前写的博文http://blog.csdn.net/hasion/article/details/43668229

其具体实现方法如下：

public class TakePhoto : MonoBehaviour{[DllImport("__Internal")]private static extern void _SavePhoto (string readaddr);private string path_save;private string path_read;public GameObject _demoBtns;void OnClick (){this.GetComponentInChildren<UITexture> ().enabled = false;_demoBtns.SetActive (false);System.DateTime now = System.DateTime.Now;string filename = string.Format ("image{0}{1}{2}{3}{4}{5}.png", now.Year, now.Month, now.Day, now.Hour, now.Minute, now.Second);path_save = filename;path_read = Application.persistentDataPath + "/" + path_save;//set photomanager.csif (!string.IsNullOrEmpty (path_save)) {PhotosManager.GetInstance ().PhotoPath = path_read;}StartCoroutine (SavePhoto ());}IEnumerator SavePhoto (){yield return new WaitForSeconds (0.2f);Application.CaptureScreenshot (path_save);yield return new WaitForSeconds (0.5f);this.GetComponentInChildren<UITexture> ().enabled = true;_demoBtns.SetActive (true);yield return new WaitForSeconds (1.2f);_SavePhoto (path_read);}}

Xcode中执行文件如下：

#import "PhotoManager.h"@implementation PhotoManager- ( void ) imageSaved: ( UIImage *) image didFinishSavingWithError:( NSError *)error          contextInfo: ( void *) contextInfo{    if (error != nil)    {        NSLog(@"有错误");    }    else    {        NSLog(@"保存结束");    }}void _SavePhoto(char *readAddr){    NSString *strReadAddr = [NSString stringWithUTF8String:readAddr];    UIImage *img = [UIImage imageWithContentsOfFile:strReadAddr];    NSLog(@"%@",[NSString stringWithFormat:@"w:%f, h:%f", img.size.width, img.size.height]);    NSLog(@"%@",[NSString stringWithFormat:@"%s",readAddr ]);    PhotoManager *instance = [PhotoManager alloc];    UIImageWriteToSavedPhotosAlbum(img, instance,                                   @selector(imageSaved:didFinishSavingWithError:contextInfo:), nil);}@end

大体执行流程就是这样的，有什么错误或者建议的地方，欢迎大家指正，谢谢！！！

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