Question

我该如何解决这个问题？我是一名新编码员。谢谢

我收到以下错误：

＆＃34;无法分配类型为＆＃39; Bool＆＃39;＆＃34;的不可变表达式

当我尝试设置＆＃34; isSelected＆＃34;到<div class="container"> <div class="row"> <div class="door"> <?php query_posts(array('post_type'=>'door_function', 'posts_per_page'=>4, 'order' => 'ASC', 'paged' => $paged,)); ?> <?php if(have_posts()) { while(have_posts()) { the_post(); ?> <div class="col-sm-3 text-center"> <span class="door_link"><a href="#<?php the_title(); ?>"><?php the_title(); ?></a></span> </div> <?php } }?> </div> </div> </div> <?php query_posts(array('post_type'=>'door_function', 'posts_per_page'=>4, 'order' => 'ASC', 'paged' => $paged,)); ?> <?php if(have_posts()) { while(have_posts()) { the_post(); ?> <div class="door_function" id="<?php the_title(); ?>"> <div class="container"> <div class="row"> <div class="col-md-4"> <div class="outer" style="overflow:hidden;"> <div id="sync1" class="owl-carousel"> <?php if( have_rows('images') ): while ( have_rows('images') ) : the_row(); ?> <div class="item"> <img src="<?php the_sub_field('post_image');?>"/> </div> <?php endwhile; endif; ?> </div> <div id="sync2" class="owl-carousel"> <?php if( have_rows('images') ): while ( have_rows('images') ) : the_row(); ?> <div class="item"> <img src="<?php the_sub_field('post_image');?>"/> </div> <?php endwhile; endif; ?> </div> </div> </div> <div class="col-md-1"> </div> <div class="col-md-7"> <h3><?php the_field('subtitle'); ?> </h3> <h2><?php the_field('title'); ?> </h2> <a href="https://www.youtube.com/watch?v=<?php the_field('video_link'); ?>">PLAY THE VIDEO</a> <p><?php the_content(); ?></p> </div> </div> </div> </div> <?php } }?>和false

true

Answer 1

您收到此错误，因为当您将发件人转换为AnyObject时，您将收到immutable类型对象，因此无法更新其属性，解决问题的最佳方法是更改发件人声明从Any到实际UIControl表示如果是按钮，则为UIButton。

@IBAction func onFilter(_ sender: UIButton) {
    hideSecondaryMenu()
    sender.isSelected = !sender.isSelected
}

如果您仍想使用Any，请将发件人转换为其所属的实际UIControl。

@IBAction func onFilter(_ sender: Any) {
    if sender is UIButton {
         let btn = sender as! UIButton
         hideSecondaryMenu()
         btn.isSelected = !btn.isSelected
    }
}

错误：＆＃34;无法分配类型＆＃39; Bool＆＃39;＆＃34;？的不可变表达式？

1 个答案: