How Do I Declare A Block in Objective-C? http://fuckingblocksyntax.com/

Block in Objective-C.txt

How Do I Declare A Block in Objective-C?
http://fuckingblocksyntax.com/
https://developer.apple.com/library/ios/documentation/cocoa/conceptual/ProgrammingWithObjectiveC/WorkingwithBlocks/WorkingwithBlocks.html

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) {...}