【iOS】常见的 Block 的声明方式

• 局部变量

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

• 属性

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

• 方法参数

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

• 方法调用的参数

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

• C函数的参数

  void SomeFunctionThatTakesABlock(returnType (^blockName)(parameterTypes));
  

• 类型定义

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

原文链接：How Do I Declare A Block in Objective-C?

title: 【iOS】常见的Block的声明方式

author: zhangpeng

date: 2018.03.10

GitHub: https://github.com/fullstack-zhangpeng