Objective-C Blocks Cheat Sheet

Block Syntax

Block as a local variable returnType (^blockName)(parameterTypes) = ^returnType(parameters) {...};
Block as a property @property (nonatomic, copy) returnType (^blockName)(parameterTypes);
Block as a method parameter - (void)someMethodThatTakesABlock:(returnType (^)(parameterTypes))blockName;
Block as an argument to a method call [someObject someMethodThatTakesABlock: ^returnType (parameters) {...}];
Block as typedef typedef returnType (^TypeName)(parameterTypes); TypeName blockName = ^returnType(parameters) {...};