好久不写简书了，最近懒的不要不要的，订的计划错过了所以的时间节点，不能再颓废了，要振作，今天看到了一个小小的网页还不错，分享一下

How Do I Declare A Block in Objective-C?

As a local variable:
returnType (^blockName)(parameterTypes) = ^returnType(parameters) {...};

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

As a method parameter:

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

As an argument to a method call:
[someObject someMethodThatTakesABlock:^returnType (parameters) {...}];

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

This site is not intended to be an exhaustive list of all possible uses of blocks.If you find yourself needing syntax not listed here, it is likely that a typedef would make your code more readable.Unable to access this site due to the profanity in the URL? http://goshdarnblocksyntax.com is a more work-friendly mirror.

借此为努力的引子，把当年发下的毒誓，跪着也要实现哈