ios11调用系用相册崩溃

AlertVC的弹出样式设置为alert会崩溃，设置应该为actionsheet

- (void)changePhotoImg {

    UIAlertController * sheetController = [UIAlertController alertControllerWithTitle:@"请选择照片"
                                                                              message:nil preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction * Cancel = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:nil];
    
    UIAlertAction * Done = [UIAlertAction actionWithTitle:@"拍照" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        
        [self selectImageSourceType:UIImagePickerControllerSourceTypeCamera];
    }];
    
    UIAlertAction * Destructive = [UIAlertAction actionWithTitle:@"从相册选择头像" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        
        [self selectImageSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
    }];
    
    [sheetController addAction:Cancel];
    [sheetController addAction:Done];
    [sheetController addAction:Destructive];
    [self presentViewController:sheetController animated:YES completion:nil];
}

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