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2015-12-12 12:14:45 +00:00
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@@ -42,8 +42,8 @@ CalendarManager<span class="token punctuation">.</span><span class="token functi
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">setState<span class="token punctuation">(</span></span><span class="token punctuation">{</span>events<span class="token punctuation">:</span> events<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span></div><p>A native module is supposed to invoke its callback only once. It can, however, store the callback and invoke it later. This pattern is often used to wrap iOS APIs that require delegates. See <a href="https://github.com/facebook/react-native/blob/master/React/Modules/RCTAlertManager.m" target="_blank"><code>RCTAlertManager</code></a> for an example.</p><p>If you want to pass error-like objects to JavaScript, use <code>RCTMakeError</code> from <a href="https://github.com/facebook/react-native/blob/master/React/Base/RCTUtils.h" target="_blank"><code>RCTUtils.h</code></a>. Right now this just passes an Error-shaped dictionary to JavaScript, but we would like to automatically generate real JavaScript <code>Error</code> objects in the future.</p><h2><a class="anchor" name="promises"></a>Promises <a class="hash-link" href="#promises">#</a></h2><p>Native modules can also fulfill a promise, which can simplify your code, especially when using ES2016&#x27;s <code>async/await</code> syntax. When the last parameters of a bridged native method are an <code>RCTPromiseResolveBlock</code> and <code>RCTPromiseRejectBlock</code>, its corresponding JS method will return a JS Promise object.</p><p>Refactoring the above code to use a promise instead of callbacks looks like this:</p><div class="prism language-javascript"><span class="token function">RCT_REMAP_METHOD<span class="token punctuation">(</span></span>findEvents<span class="token punctuation">,</span>
resolver<span class="token punctuation">:</span><span class="token punctuation">(</span>RCTPromiseResolveBlock<span class="token punctuation">)</span>resolve<span class="token punctuation">,</span>
rejecter<span class="token punctuation">:</span><span class="token punctuation">(</span>RCTPromiseRejectBlock<span class="token punctuation">)</span>reject<span class="token punctuation">)</span><span class="token punctuation">)</span>
resolver<span class="token punctuation">:</span><span class="token punctuation">(</span>RCTPromiseResolveBlock<span class="token punctuation">)</span>resolve
rejecter<span class="token punctuation">:</span><span class="token punctuation">(</span>RCTPromiseRejectBlock<span class="token punctuation">)</span>reject<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
NSArray <span class="token operator">*</span>events <span class="token operator">=</span> <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>events<span class="token punctuation">)</span> <span class="token punctuation">{</span>