堅持，春暖花開.jpg

本文翻譯自http://fuckingblocksyntax.com/

作為局部變量：

  returnType(^blockName)(parameterTypes) = ^returnType(parameters) {...};

作為屬性：

  @property (nonatomic, copy) returnType (^blockName)(parameterTypes);

作為參數：

  - (void)someMethodThatTakesABlock:(returnType (^nullability)(parameterTypes))blockName;

作為方法調用參數：

  [someObject someMethodThatTakesABlock:^returnType (parameters) {...} ];

作為typedef

  typedef returnType (^TypeName)(parameterTypes);
  TypeName blockName = ^returnType(parameters) {...};