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  UITableView顶部空白的几种解决办法 - kaelinda

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          <h1>UITableView顶部空白的几种解决办法</h1>

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          <span class="date">2019/2/14</span>

          <span>posted in&nbsp;</span>

              <span class="posted-in"><a href='ios.html'>iOS</a></span>


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<li><p>一、iOS7在Controller中增加了<code>automaticallyAdjustsScrollViewInsets</code>这个属性，当设置为YES时（默认YES），如果视图里面存在唯一一个UIScrollView或其子类View，那么它会自动设置相应的内边距，这样可以让scroll占据整个视图，又不会让导航栏遮盖。但是这个属性在iOS11之后被遗弃了，新增了一个<code>contentInsetAdjustmentBehavior</code>属性：</p>
<pre><code class="language-text">if (@available(iOS 11.0, *)) {
    self.tableview.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;    <br/>
}else {<br/>
    self.automaticallyAdjustsScrollViewInsets = NO;<br/>
}
</code></pre></li>
<li><p>二、UINavigationBar的透明度设置<code>self.navigationController.navigationBar.translucent = NO;</code><br/>
当这个属性设为NO时，tableview会在上方留出64.f的高度给navigationbar</p></li>
<li><p>三、tableView  </p>
<p>section的Header/Footer高度设置如果这个Header/Footer的height设置为0时，系统会认为你没有设置，从而给一个默认40的高度；若不需要显示这两个view，将他们的height设置一个无限小的数字即可，常用：CGFLOAT_MIN。</p>
<pre><code class="language-text">- (CGFloat)tableView:(UITableView*)tableView heightForHeaderInSection:(NSInteger)section{
    return CGFLOAT_MIN;<br/>
}
</code></pre></li>
<li><p>四、tableHeaderView、tableFooterView高度设置以下操作会导致tableView顶部空白：</p>
<pre><code class="language-text">self.tableView.tableHeaderView = nil;
self.tableView.tableHeaderView = [[UIView alloc] init]; <br/>
self.tableView.tableHeaderView = [[UIView alloc] initWithFrame:CGRectZero];
</code></pre>
<p>同理，tableFooterView也是如此。footer和header只要设置了任意一个都会使两个地方都出现空白。应这样设置：</p>
<pre><code class="language-text">self.tableView.tableHeaderView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, CGFLOAT_MIN)];
self.tableView.tableFooterView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, CGFLOAT_MIN)];
</code></pre></li>
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