How Do I Declare A Block in Objective C
接触OC也有段时间了，对Block的语法一直有点犯迷糊，结果发现了一个有意思的网站，FuckingBlockSyntax，下面就是这个网站的全部内容，转载一下，供以后查阅。
As a local variable:
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| returnType (^blockName)(parameterTypes) = ^returnType(parameters) {...};
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As a property:
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| @property (nonatomic, copy) returnType (^blockName)(parameterTypes);
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As a method parameter:
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| - (void)someMethodThatTakesABlock:(returnType (^)(parameterTypes))blockName;
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As an argument to a method call:
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| [someObject someMethodThatTakesABlock:^returnType (parameters) {...}];
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As a typedef:
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| typedef returnType (^TypeName)(parameterTypes);
TypeName blockName = ^returnType(parameters) {...};
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