将图片保存到本地相册

点击按钮，将self.imageView上面的image内容保存到本地相册，并指定判断保存成功与否的方法 imageSavedToPhotosAlbum:didFinishSavingWithError:contextInfo: - (IBAction)saveImageToAlbum:(id)sender {     UIImageWriteToSavedPhotosAlbum(self.imageView.image, self, @selector(imageSavedToPhotosAlbum:didFinishSavingWithError:contextInfo:), nil); } // 实现imageSavedToPhotosAlbum:didFinishSavingWithError:contextInfo:方法 - (void)imageSavedToPhotosAlbum:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo {     NSString *message;     if (!error) {         message = @"成功保存到相册";     }else     {         message = [error description];     }     NSLog(@"message is %@",message); }