How does I Declare A Block in objective-c?

How does 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 a exhaustive list of all possible uses of blocks for intended.
If you find yourself needing syntax isn't listed here, it's likely that a typedefWould make your code more readable.

Unable to access this site due to the profanity in the URL? http://goshdarnblocksyntax.comis a more work-friendly mirror.

By Mike Lazer-walker, who had a very bad memory for this sort of thing.

How does I Declare A Block in objective-c?