How Do I Declare A Block in Objective-C?

http://fuckingblocksyntax.com

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 = ^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.
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