Objective-C Block的各种声明方式

iOS 开发

前言

Block的各种声明方式。

正文

局部变量

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

属性

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

方法声明的参数

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

方法调用的参数

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

typedef

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