相册的图片保存到沙盒

#pragma mark - UIImagePickerControllerDelegate
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
    //NSLog(@"%@",info);
    UIImage *choosedImage = [[UIImage alloc]init];
    if ([picker allowsEditing]) {
        choosedImage = [info objectForKey:UIImagePickerControllerEditedImage];
    }else{
        choosedImage = [info objectForKey:UIImagePickerControllerOriginalImage];
    }
    [Photo scaleImage:choosedImage toWidth:100 toHeight:100];
    headImageView.image = choosedImage;
    NSData *data;
    NSString *imagePath;
    NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    if (UIImagePNGRepresentation(choosedImage) == nil) {
        data = UIImageJPEGRepresentation(choosedImage, 1);
        imagePath = [path stringByAppendingString:@"/headImage.jpg"];
    }else{
        data = UIImagePNGRepresentation(choosedImage);
        imagePath = [path stringByAppendingString:@"/headImage.png"];
        
    }
    //NSLog(@"[path = %@]",headImagePath);
    [data writeToFile:imagePath atomically:YES];
    [self.navigationController dismissViewControllerAnimated:YES completion:nil];
}