Fucking Blocks Syntax

This is how you can declare a block in Objective-C

As a local variable:

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

As a property:

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

As a method parameter:

- (void)someMethodThatTakesABlock:(returnType (^)(parameterTypes))blockName {...}

As an argument to a method call:

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

As a typedef:

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

Thanks to Mike Walker that, like me, he has a very bad memory for this sort of thing.