警告视图 注销按钮时候的操作

//注销按钮时候的操作
- (IBAction)logOutButClick:(UIBarButtonItem *)sender {
    //创建UIalercontroller对象
    UIAlertController *alertVC = [UIAlertController alertControllerWithTitle:@"提示确定注销吗?" message:@"取消" preferredStyle:UIAlertControllerStyleActionSheet];
    /**   UIAlertActionStyleDefault = 0,  默认
     UIAlertActionStyleCancel,            取消
     UIAlertActionStyleDestructive        销毁
     */
    // 创建确实按钮
    UIAlertAction *ok = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {
//回到上个控制器
        [self.navigationController popViewControllerAnimated:YES];
    }];
    
    // 创建取消按钮
    UIAlertAction *cancle = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
    
    //把这两个按钮添加到提示框中
    [alertVC addAction:ok];
    [alertVC addAction:cancle];
    //弹出提示框
    [self presentViewController:alertVC animated:YES completion:nil];
}