Ios 将图像保存到照片库并获取保存图像的URL

我正在尝试将图像从相机保存到照片库，然后存储保存图像的URL。我的代码：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

ALAssetsLibrary *library = [[ALAssetsLibrary alloc]init];
[library writeImageToSavedPhotosAlbum:(__bridge CGImageRef)([info objectForKey:UIImagePickerControllerOriginalImage])
                          orientation:ALAssetOrientationUp completionBlock:^(NSURL *assetURL, NSError *error) {
                              if(error == nil) {
                                  _myImageUrl = [NSString stringWithFormat:@"%@",assetURL];
                                  NSLog(@"%@",assetURL);
                              } else NSLog(@"%@",error);
                          }];

[picker dismissViewControllerAnimated:YES completion:nil];}

我的问题是assetUrl总是空的。有什么想法吗？

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谢谢大家!

最后，在阅读了更多内容后，我发现了答案：函数的第一个参数是

cgmageref

类型，

（\uu桥cgmageref）

没有达到我的预期；但是如果我调用

UIImage

对象的

CGImage

方法，它就可以工作了。正确的方法是：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

    ALAssetsLibrary *library = [[ALAssetsLibrary alloc]init];
    CGImageRef image = [[info objectForKey:UIImagePickerControllerOriginalImage] CGImage];
    [library writeImageToSavedPhotosAlbum:image
                              orientation:ALAssetOrientationUp
                          completionBlock:^(NSURL *assetURL, NSError *error) {
                                  if(error == nil) {
                                      _myImageUrl = [NSString stringWithFormat:@"%@",assetURL];
                                      NSLog(@"%@",assetURL);
                                  } else NSLog(@"%@",error);
                              }];

    self.toDoImage.image = [info objectForKey:UIImagePickerControllerOriginalImage];
    [picker dismissViewControllerAnimated:YES completion:nil];
}

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这可能与这篇文章有关。可能是一个iOS7错误。[AlasSetLibraryWriteVideoCompletionBlock返回未定义的值][1][1]：