//保存圖片-(void)saveImageDocuments:(UIImage *)image{  //拿到圖片  UIImage *imagesave = image;  NSString *path_sandox = NSHomeDirectory();  //設置一個圖片的存儲路徑  NSString *imagePath = [path_sandox stringByAppendingString:@"/Documents/test.png"];  //把圖片直接保存到指定的路徑（同時應該把圖片的路徑imagePath存起來，下次就可以直接用來?。? [UIImagePNGRepresentation(imagesave) writeToFile:imagePath atomically:YES];}// 讀取并存貯到相冊 -(UIImage *)getDocumentImage{  // 讀取沙盒路徑圖片  NSString *aPath3=[NSString stringWithFormat:@"%@/Documents/%@.png",NSHomeDirectory(),@"test"];  // 拿到沙盒路徑圖片  UIImage *imgFromUrl3=[[UIImage alloc]initWithContentsOfFile:aPath3];  // 圖片保存相冊  UIImageWriteToSavedPhotosAlbum(imgFromUrl3, self, nil, nil);  return imgFromUrl3;}