iOS11 需要新增

Privacy - photo LIbrary Additions Usage Description 新增到相簿。

- (void)saveTophone:(UIImage *)image {

    UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), (__bridge void *)self);

}

- (void)image:(UIImage *)image didFinishSavingWithError:(NSError

NSLog(@"image = %@, error = %@, contextInfo = %@", image, error, contextInfo);

}