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<h2 id="NSTimer"><a href="#NSTimer" class="headerlink" title="NSTimer"></a>NSTimer</h2><p>NSTimer 其实就是 CFRunLoopTimerRef，他们之间是 toll-free bridged 的。一个 NSTimer 注册到 RunLoop 后，RunLoop 会为其重复的时间点注册好事件。例如 10:00, 10:10, 10:20 这几个时间点。RunLoop为了节省资源，并不会在非常准确的时间点回调这个Timer。Timer 有个属性叫做 Tolerance (宽容度)，标示了当时间点到后，容许有多少最大误差。如果某个时间点被错过了，例如执行了一个很长的任务，则那个时间点的回调也会跳过去，不会延后执行。就比如等公交，如果 10:10 时我忙着玩手机错过了那个点的公交，那我只能等 10:20 这一趟了。</p>
<h3 id="创建"><a href="#创建" class="headerlink" title="创建"></a>创建</h3><figure class="highlight objectivec"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/// 一种是timerWithXXX，</span></span><br><span class="line">+ (<span class="built_in">NSTimer</span> *)timerWithTimeInterval:(<span class="built_in">NSTimeInterval</span>)ti target:(<span class="keyword">id</span>)aTarget selector:(SEL)aSelector userInfo:(<span class="keyword">nullable</span> <span class="keyword">id</span>)userInfo repeats:(<span class="built_in">BOOL</span>)yesOrNo</span><br><span class="line"></span><br><span class="line"><span class="comment">/// 一种是scheduedTimerWithXXX</span></span><br><span class="line">+ (<span class="built_in">NSTimer</span> *)scheduledTimerWithTimeInterval:(<span class="built_in">NSTimeInterval</span>)ti target:(<span class="keyword">id</span>)aTarget selector:(SEL)aSelector userInfo:(<span class="keyword">nullable</span> <span class="keyword">id</span>)userInfo repeats:(<span class="built_in">BOOL</span>)yesOrNo</span><br><span class="line">``` </span><br><span class="line"></span><br><span class="line"><span class="meta">### 区别：</span></span><br><span class="line">- 后者除了创建一个定时器外会自动以<span class="built_in">NSDefaultRunLoopModeMode</span>添加到当前线程RunLoop中</span><br><span class="line">- 不添加到RunLoop中的<span class="built_in">NSTimer</span>是无法正常工作的。</span><br><span class="line"></span><br><span class="line"><span class="meta">### 注意事项</span></span><br><span class="line"></span><br><span class="line">- 注意timer添加到runloop时应该设置为什么mode</span><br><span class="line">- 注意timer在不需要时，一定要调用invalidate方法释放定时器</span><br><span class="line">- <span class="built_in">NSTimer</span>不是一种实时机制，可能存在误差</span><br><span class="line"></span><br><span class="line"><span class="meta">### UITableView 与 NSTimer 冲突</span></span><br><span class="line">解决方案：</span><br></pre></td></tr></table></figure>
<ol>
<li>更改RunLoop运行Mode（NSRunLoopCommonModes）<br>[[NSRunLoop currentRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];</li>
<li>将NSTimer放到新的线程中<br>NSThread *thread = [[NSThread alloc] initWithTarget:self selector:@selector(newThread) object:nil];<br> [thread start];</li>
</ol>
<ul>
<li>(void)newThread{<br> @autoreleasepool{<pre><code>//在当前Run Loop中添加timer，模式是默认的NSDefaultRunLoopMode
timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(incrementCounter:) userInfo: nil repeats:YES];
//开始执行新线程的Run Loop，如果不启动run loop，timer的事件是不会响应的
[[NSRunLoop currentRunLoop] run];
</code></pre> }<br>}<br><code>`</code></li>
</ul>
<blockquote>
<p>CADisplayLink是一个执行频率（fps）和屏幕刷新相同（可以修改preferredFramesPerSecond改变刷新频率）的定时器，它也需要加入到RunLoop才能执行。与NSTimer类似，CADisplayLink同样是基于CFRunloopTimerRef实现，底层使用mk_timer（可以比较加入到RunLoop前后RunLoop中timer的变化）。和NSTimer相比它精度更高（尽管NSTimer也可以修改精度），不过和NStimer类似的是如果遇到大任务它仍然存在丢帧现象。通常情况下CADisaplayLink用于构建帧动画，看起来相对更加流畅，而NSTimer则有更广泛的用处。</p>
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