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September 2, 2013 00:15
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| <head> | |
| <title>How Do I Declare A Block in Objective-C?</title> | |
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| </style> | |
| </head> | |
| <body> | |
| <h1>How Do I Declare A Block in Objective-C?</h1> | |
| <div> | |
| <h2>As a <strong>local variable</strong>:</h2> | |
| <code> | |
| <span class='return'>returnType</span> (^<span class='name'>blockName</span>)(<span class='parameter-types'>parameterTypes</span>) = ^<span class='return'>returnType</span>(<span class='parameters'>parameters</span>) {...}; | |
| </code> | |
| </div> | |
| <div> | |
| <h2>As a <strong>property</strong>:</h2> | |
| <code> | |
| @property (nonatomic, copy) <span class='return'>returnType</span> (^<span class='name'>blockName</span>)(<span class='parameter-types'>parameterTypes</span>); | |
| </code> | |
| </div> | |
| <div> | |
| <h2>As a <strong>method parameter</strong>:</h2> | |
| <code> | |
| - (void)someMethodThatTakesABlock:(<span class='return'>returnType</span> (^)(<span class='parameter-types'>parameterTypes</span>))<span class='name'>blockName</span> {...} | |
| </code> | |
| </div> | |
| <div> | |
| <h2>As an <strong>argument to a method call</strong>:</h2> | |
| <code> | |
| [someObject someMethodThatTakesABlock: ^<span class='return'>returnType</span> (<span class='parameters'>parameters</span>) {...}]; | |
| </code> | |
| </div> | |
| <div> | |
| <h2>As a <strong>typedef</strong>:</h2> | |
| <code> | |
| typedef <span class='return'>returnType</span> (^<span class='name'>TypeName</span>)(<span class='parameter-types'>parameterTypes</span>);<br/> | |
| <span class='name'>TypeName</span> blockName = ^(<span class='parameters'>parameters</span>) {...} | |
| </code> | |
| </div> | |
| <footer>By <a href="http://lazerwalker.com">Mike Walker</a>, who has a very bad memory for this sort of thing.</footer> | |
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